Subj : Southern Ontario Weather To : All From : Northern Realms Date : Mon Aug 18 2025 05:05:00 FPCN11 CWTO 180900 Forecasts for Southern Ontario and the National Capital Region issued by Environment Canada at 5:00 a.m. EDT Monday 18 August 2025 for today and Tuesday. The next scheduled forecast will be issued at 11:00 a.m. EDT. City of Toronto. Today..Sunny. Wind becoming east 20 km/h gusting to 40 near noon. High 23. UV index 8 or very high. Tonight..Clear. Wind east 20 km/h becoming light this evening. Low 15. Tuesday..Mainly cloudy. 30 percent chance of showers in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 7 or high. Windsor - Leamington - Essex County. Today..A mix of sun and cloud. Wind northeast 20 km/h. High 25. Humidex 27. UV index 9 or very high. Tonight..Clear. Increasing cloudiness near midnight. Fog patches developing overnight. Wind east 20 km/h becoming light this evening. Low 16. Tuesday..Cloudy. 30 percent chance of showers late in the morning and early afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. Fog patches dissipating in the morning. High 27. Humidex 30. UV index 6 or high. Chatham-Kent - Rondeau Park. Today..Clearing early this morning. Wind northeast 20 km/h. High 25. Humidex 27. UV index 9 or very high. Tonight..Clear. Fog patches developing overnight. Wind east 20 km/h becoming light this evening. Low 16. Tuesday..Cloudy. 30 percent chance of showers late in the morning and early afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. Fog patches dissipating in the morning. High 27. Humidex 30. UV index 6 or high. Sarnia - Petrolia - Western Lambton County. Today..Sunny. Wind northeast 20 km/h. High 25. Humidex 27. UV index 9 or very high. Tonight..Clear. Becoming partly cloudy overnight. Wind east 20 km/h becoming light this evening. Low 15. Tuesday..Cloudy. 30 percent chance of showers late in the morning and early afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 26. Humidex 29. UV index 6 or high. Watford - Pinery Park - Eastern Lambton County. Today..Mainly sunny. Wind northeast 20 km/h. High 25. Humidex 27. UV index 9 or very high. Tonight..Clear. Becoming partly cloudy overnight. Wind east 20 km/h becoming light this evening. Low 15. Tuesday..Mainly cloudy. 30 percent chance of showers late in the morning and early afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 26. Humidex 29. UV index 7 or high. Rodney - Shedden - Western Elgin County. Today..Sunny. Wind becoming east 20 km/h gusting to 40 near noon. High 25. Humidex 27. UV index 9 or very high. Tonight..Clear. Wind east 20 km/h gusting to 40 becoming light this evening. Low 15. Tuesday..Increasing cloudiness. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 26. Humidex 28. UV index 6 or high. St. Thomas - Aylmer - Eastern Elgin County. Today..Sunny. Wind becoming east 20 km/h gusting to 40 near noon. High 25. Humidex 27. UV index 9 or very high. Tonight..Clear. Wind east 20 km/h gusting to 40 becoming light this evening. Low 15. Tuesday..Becoming cloudy in the morning. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 26. Humidex 28. UV index 6 or high. Strathroy - Komoka - Western Middlesex County. Today..Clearing early this morning. Wind becoming east 20 km/h gusting to 40 near noon. High 23. UV index 9 or very high. Tonight..Clear. Wind east 20 km/h gusting to 40 becoming light this evening. Low 13. Tuesday..Becoming cloudy in the morning. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 6 or high. London - Parkhill - Eastern Middlesex County. Today..Clearing early this morning. Wind becoming east 20 km/h gusting to 40 near noon. High 23. UV index 9 or very high. Tonight..Clear. Wind east 20 km/h gusting to 40 becoming light this evening. Low 13. Tuesday..Becoming cloudy in the morning. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 6 or high. Simcoe - Delhi - Norfolk. Today..Clearing early this morning. Wind becoming northeast 20 km/h gusting to 40 late this morning. High 23. Humidex 25. UV index 9 or very high. Tonight..Clear. Wind northeast 20 km/h becoming light late this evening. Low 17. Tuesday..Becoming cloudy in the morning. 30 percent chance of showers in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 27. Humidex 33. UV index 6 or high. Dunnville - Caledonia - Haldimand. Today..Mainly sunny. Wind becoming northeast 20 km/h gusting to 40 late this morning. High 23. Humidex 25. UV index 9 or very high. Tonight..Clear. Wind northeast 20 km/h becoming light late this evening. Low 17. Tuesday..Cloudy. 30 percent chance of showers in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 27. Humidex 33. UV index 7 or high. Woodstock - Tillsonburg - Oxford County. Today..Clearing early this morning. Wind becoming east 20 km/h gusting to 40 near noon. High 23. UV index 9 or very high. Tonight..Clear. Wind east 20 km/h gusting to 40 becoming light this evening. Low 13. Tuesday..Becoming cloudy in the morning. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 6 or high. Brantford - County of Brant. Today..Clearing early this morning. Wind becoming east 20 km/h gusting to 40 near noon. High 23. UV index 9 or very high. Tonight..Clear. Wind east 20 km/h gusting to 40 becoming light this evening. Low 13. Tuesday..Becoming cloudy in the morning. 30 percent chance of showers in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 7 or high. Niagara Falls - Welland - Southern Niagara Region. Today..Clearing early this morning. Wind becoming northeast 20 km/h gusting to 40 late this morning. High 23. Humidex 25. UV index 9 or very high. Tonight..Clear. Becoming partly cloudy after midnight. Wind northeast 20 km/h becoming light late this evening. Low 17. Tuesday..Mainly cloudy. 30 percent chance of showers in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 27. Humidex 33. UV index 8 or very high. St. Catharines - Grimsby - Northern Niagara Region. Today..Clearing early this morning. Wind becoming northeast 20 km/h gusting to 40 late this morning. High 23. Humidex 25. UV index 9 or very high. Tonight..Clear. Becoming partly cloudy overnight. Wind northeast 20 km/h becoming light late this evening. Low 17. Tuesday..Mainly cloudy. 30 percent chance of showers in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 27. Humidex 33. UV index 8 or very high. City of Hamilton. Today..Clearing early this morning. Wind becoming east 20 km/h gusting to 40 near noon. High 23. UV index 9 or very high. Tonight..Clear. Wind east 20 km/h gusting to 40 becoming light this evening. Low 13. Tuesday..Becoming cloudy in the morning. 30 percent chance of showers in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 8 or very high. Burlington - Oakville. Today..Sunny. Wind becoming east 20 km/h gusting to 40 near noon. High 23. UV index 9 or very high. Tonight..Clear. Wind east 20 km/h becoming light this evening. Low 15. Tuesday..Mainly cloudy. 30 percent chance of showers in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 8 or very high. Halton Hills - Milton. Today..Sunny. Wind becoming east 20 km/h gusting to 40 near noon. High 23. UV index 9 or very high. Tonight..Clear. Wind east 20 km/h becoming light this evening. Low 15. Tuesday..Increasing cloudiness. 30 percent chance of showers in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 8 or very high. Mississauga - Brampton. Today..Sunny. Wind becoming east 20 km/h gusting to 40 near noon. High 23. UV index 9 or very high. Tonight..Clear. Wind east 20 km/h becoming light this evening. Low 15. Tuesday..Increasing cloudiness. 30 percent chance of showers in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 8 or very high. Caledon. Today..Sunny. Wind becoming east 20 km/h near noon. High 23. UV index 9 or very high. Tonight..Clear. Low 12. Tuesday..A mix of sun and cloud. Becoming cloudy near noon with 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 8 or very high. Vaughan - Richmond Hill - Markham. Today..Sunny. Wind becoming east 20 km/h gusting to 40 near noon. High 23. UV index 9 or very high. Tonight..Clear. Wind east 20 km/h becoming light this evening. Low 15. Tuesday..Increasing cloudiness. 30 percent chance of showers in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 8 or very high. Newmarket - Georgina - Northern York Region. Today..Sunny. High 23. UV index 9 or very high. Tonight..Clear. Low 11. Tuesday..Increasing cloudiness. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 30. UV index 8 or very high. Pickering - Oshawa - Southern Durham Region. Today..Sunny. Wind becoming east 20 km/h gusting to 40 near noon. High 23. UV index 9 or very high. Tonight..Clear. Wind east 20 km/h becoming light this evening. Low 15. Tuesday..Increasing cloudiness. 30 percent chance of showers in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 8 or very high. Uxbridge - Beaverton - Northern Durham Region. Today..Sunny. High 23. UV index 9 or very high. Tonight..Clear. Low 11. Tuesday..Increasing cloudiness. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 30. UV index 8 or very high. Goderich - Bluewater - Southern Huron County. Today..Sunny. Wind becoming east 20 km/h near noon. High 24. UV index 8 or very high. Tonight..Clear. Becoming partly cloudy after midnight. Low 13. Tuesday..Cloudy. 30 percent chance of showers late in the morning and early afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 24. Humidex 28. UV index 6 or high. Wingham - Blyth - Northern Huron County. Today..Sunny. Wind becoming east 20 km/h near noon. High 24. UV index 8 or very high. Tonight..Clear. Becoming partly cloudy overnight. Low 13. Tuesday..Cloudy. 30 percent chance of showers late in the morning and early afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 24. Humidex 28. UV index 6 or high. Stratford - Mitchell - Southern Perth County. Today..Sunny. Wind becoming east 20 km/h near noon. High 23. UV index 8 or very high. Tonight..Clear. Low 12. Tuesday..Becoming cloudy in the morning. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 6 or high. Listowel - Milverton - Northern Perth County. Today..Sunny. Wind becoming east 20 km/h near noon. High 23. UV index 8 or very high. Tonight..Clear. Low 12. Tuesday..Becoming cloudy in the morning. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 6 or high. Kitchener - Cambridge - Region of Waterloo. Today..Sunny. Wind becoming east 20 km/h near noon. High 23. UV index 9 or very high. Tonight..Clear. Low 12. Tuesday..Becoming cloudy in the morning. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 7 or high. Guelph - Erin - Southern Wellington County. Today..Sunny. Wind becoming east 20 km/h near noon. High 23. UV index 9 or very high. Tonight..Clear. Low 12. Tuesday..Becoming cloudy in the morning. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 8 or very high. Mount Forest - Arthur - Northern Wellington County. Today..Sunny. Wind becoming east 20 km/h near noon. High 23. UV index 9 or very high. Tonight..Clear. Low 12. Tuesday..Mainly cloudy. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 7 or high. Orangeville - Grand Valley - Southern Dufferin County. Today..Sunny. Wind becoming east 20 km/h near noon. High 23. UV index 9 or very high. Tonight..Clear. Low 12. Tuesday..A mix of sun and cloud. Becoming cloudy near noon with 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 8 or very high. Shelburne - Mansfield - Northern Dufferin County. Today..Sunny. Wind becoming east 20 km/h near noon. High 23. UV index 9 or very high. Tonight..Clear. Low 12. Tuesday..A mix of sun and cloud. Becoming cloudy near noon with 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 29. UV index 8 or very high. Innisfil - New Tecumseth - Angus. Today..Sunny. High 23. UV index 9 or very high. Tonight..Clear. Low 11. Tuesday..Mainly sunny. Increasing cloudiness late in the morning then 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 30. UV index 8 or very high. Saugeen Shores - Kincardine - Southern Bruce County. Today..Sunny. High 23. UV index 8 or very high. Tonight..Clear. Becoming partly cloudy after midnight. Low 12. Tuesday..Cloudy. 30 percent chance of showers late in the morning and early afternoon then 70 percent chance of showers in the afternoon. Risk of a thunderstorm in the afternoon. High 25. Humidex 29. UV index 6 or high. Bruce Peninsula - Sauble Beach - Tobermory. Today..Sunny. Wind east 20 km/h gusting to 40. High 21. UV index 8 or very high. Tonight..Clear. Increasing cloudiness after midnight. Wind east 20 km/h becoming light this evening. Low 14. Tuesday..Cloudy. 30 percent chance of showers changing to 70 percent chance of showers near noon. Risk of a thunderstorm in the afternoon. High 23. Humidex 27. UV index 5 or moderate. Hanover - Dundalk - Southern Grey County. Today..Sunny. High 23. UV index 8 or very high. Tonight..Clear. Low 12. Tuesday..Increasing cloudiness. 30 percent chance of showers late in the morning and early afternoon then 70 percent chance of showers in the afternoon. Risk of a thunderstorm in the afternoon. High 25. Humidex 29. UV index 7 or high. Owen Sound - Blue Mountains - Northern Grey County. Today..Sunny. High 23. UV index 8 or very high. Tonight..Clear. Becoming partly cloudy overnight. Low 12. Tuesday..A mix of sun and cloud. Becoming cloudy late in the morning with 30 percent chance of showers late in the morning and early afternoon then 70 percent chance of showers in the afternoon. Risk of a thunderstorm in the afternoon. High 25. Humidex 29. UV index 6 or high. Barrie - Collingwood - Hillsdale. Today..Sunny. High 23. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..A mix of sun and cloud. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 28. UV index 8 or very high. Midland - Coldwater - Orr Lake. Today..Sunny. High 23. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..Mainly sunny. Increasing cloudiness late in the morning then 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 28. UV index 8 or very high. Orillia - Lagoon City - Washago. Today..Sunny. High 23. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..A mix of sun and cloud. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 25. Humidex 28. UV index 8 or very high. Cobourg - Colborne - Western Northumberland County. Today..Sunny. Wind becoming northeast 20 km/h gusting to 40 late this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 13. Tuesday..Sunny early in the morning then a mix of sun and cloud with 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. High 25. Humidex 29. UV index 8 or very high. Belleville - Quinte West - Eastern Northumberland County. Today..Sunny. Wind becoming northeast 20 km/h gusting to 40 late this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 13. Tuesday..Sunny early in the morning then a mix of sun and cloud with 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. High 25. Humidex 29. UV index 8 or very high. Picton - Sandbanks Park. Today..Sunny. Wind becoming northeast 20 km/h gusting to 40 late this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 13. Tuesday..Sunny early in the morning then a mix of sun and cloud with 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. High 25. Humidex 29. UV index 8 or very high. Napanee - Consecon. Today..Sunny. Wind becoming northeast 20 km/h gusting to 40 late this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 13. Tuesday..Sunny early in the morning then a mix of sun and cloud with 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. High 25. Humidex 29. UV index 8 or very high. Kingston - Odessa - Frontenac Islands. Today..Sunny. Wind becoming northeast 20 km/h gusting to 40 late this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 13. Tuesday..Sunny early in the morning then a mix of sun and cloud with 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. High 25. Humidex 29. UV index 8 or very high. Lindsay - Southern Kawartha Lakes. Today..Sunny. High 23. UV index 8 or very high. Tonight..Clear. Low 11. Tuesday..Increasing cloudiness. 30 percent chance of showers changing to 70 percent chance of showers near noon. High 25. Humidex 29. UV index 8 or very high. Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes. Today..Sunny. High 21. UV index 8 or very high. Tonight..Clear. Low 9. Tuesday..Sunny early in the morning then a mix of sun and cloud with 30 percent chance of showers changing to 70 percent chance of showers near noon. High 23. UV index 8 or very high. Peterborough City - Lakefield - Southern Peterborough County. Today..Sunny. High 23. UV index 8 or very high. Tonight..Clear. Low 11. Tuesday..Sunny early in the morning then a mix of sun and cloud with 30 percent chance of showers changing to 70 percent chance of showers near noon. High 25. Humidex 29. UV index 8 or very high. Apsley - Woodview - Northern Peterborough County. Today..Sunny. High 21. UV index 8 or very high. Tonight..Clear. Low 9. Tuesday..Increasing cloudiness. 30 percent chance of showers changing to 70 percent chance of showers near noon. High 23. UV index 8 or very high. Stirling - Tweed - Madoc. Today..Sunny. Wind becoming northeast 20 km/h gusting to 40 late this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 13. Tuesday..Sunny early in the morning then a mix of sun and cloud with 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. High 25. Humidex 29. UV index 7 or high. Tamworth - Sydenham - South Frontenac. Today..Sunny. Wind becoming northeast 20 km/h gusting to 40 late this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 13. Tuesday..Sunny early in the morning then a mix of sun and cloud with 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. High 25. Humidex 29. UV index 8 or very high. Kaladar - Bannockburn - Bon Echo Park. Today..Sunny. High 21. UV index 8 or very high. Tonight..Clear. Low 9. Tuesday..Increasing cloudiness. 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. High 23. UV index 7 or high. Bancroft - Hastings Highlands - Denbigh. Today..Sunny. High 21. UV index 8 or very high. Tonight..Clear. Low 8. Tuesday..Increasing cloudiness. 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. High 23. UV index 7 or high. Gananoque - Mallorytown. Today..Sunny. Fog patches dissipating this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. High 23. Humidex 26. UV index 8 or very high. Brockville - Prescott. Today..Sunny. Fog patches dissipating this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..A mix of sun and cloud. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. High 23. Humidex 26. UV index 8 or very high. Westport - Charleston Lake. Today..Sunny. Fog patches dissipating this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..A mix of sun and cloud. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. High 23. Humidex 26. UV index 8 or very high. Merrickville-Wolford - Kemptville. Today..Sunny. Fog patches dissipating this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..A mix of sun and cloud. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. High 23. Humidex 26. UV index 8 or very high. Ottawa North - Kanata - Orl‚ans. Today..Sunny. Fog patches dissipating this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. High 23. Humidex 26. UV index 8 or very high. Ottawa South - Richmond - Metcalfe. Today..Sunny. Fog patches dissipating this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. High 23. Humidex 26. UV index 8 or very high. Gatineau. Today..Sunny. Fog patches dissipating this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. High 23. Humidex 26. UV index 8 or very high. Prescott and Russell. Today..Sunny. Fog patches dissipating this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. High 23. Humidex 26. UV index 8 or very high. Morrisburg - Long Sault. Today..Sunny. Fog patches dissipating this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. High 23. Humidex 26. UV index 8 or very high. Cornwall - Lancaster. Today..Sunny. Fog patches dissipating this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. High 23. Humidex 26. UV index 8 or very high. Winchester - Newington. Today..Sunny. Fog patches dissipating this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. High 23. Humidex 26. UV index 8 or very high. Maxville - Alexandria. Today..Sunny. Fog patches dissipating this morning. High 22. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. High 23. Humidex 26. UV index 8 or very high. Plevna - Sharbot Lake - Western Lanark County. Today..Sunny. High 21. UV index 8 or very high. Tonight..Clear. Low 9. Tuesday..A mix of sun and cloud. 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. High 23. UV index 7 or high. Smiths Falls - Perth - Eastern Lanark County. Today..Sunny. High 21. UV index 8 or very high. Tonight..Clear. Low 9. Tuesday..A mix of sun and cloud. 30 percent chance of showers early in the afternoon then 70 percent chance of showers late in the afternoon. High 23. UV index 8 or very high. Port Carling - Port Severn. Today..Sunny. High 22. UV index 8 or very high. Tonight..Clear. Low 12. Tuesday..A mix of sun and cloud. 30 percent chance of showers changing to 70 percent chance of showers near noon. High 22. UV index 8 or very high. Bracebridge - Gravenhurst. Today..Sunny. High 21. UV index 8 or very high. Tonight..Clear. Low 8. Tuesday..Mainly cloudy. 30 percent chance of showers changing to 70 percent chance of showers near noon. High 23. UV index 8 or very high. Town of Parry Sound - Rosseau - Killbear Park. Today..Sunny. High 22. UV index 8 or very high. Tonight..Clear. Low 12. Tuesday..Cloudy. 30 percent chance of showers changing to 70 percent chance of showers near noon. High 22. UV index 6 or high. Huntsville - Baysville. Today..Sunny. High 20. UV index 8 or very high. Tonight..Clear. Low 8. Tuesday..Mainly cloudy. 30 percent chance of showers changing to 70 percent chance of showers near noon. High 21. UV index 6 or high. Haliburton - Minden - Southern Haliburton County. Today..Sunny. High 21. UV index 8 or very high. Tonight..Clear. Low 8. Tuesday..Mainly cloudy. 30 percent chance of showers changing to 70 percent chance of showers near noon. High 23. UV index 8 or very high. Oxtongue Lake - Fort Irwin - Northern Haliburton County. Today..Sunny. High 20. UV index 8 or very high. Tonight..Clear. Low 8. Tuesday..Mainly cloudy. 30 percent chance of showers changing to 70 percent chance of showers near noon. High 21. UV index 6 or high. Barry's Bay - Killaloe. Today..Sunny. High 21. UV index 8 or very high. Tonight..Clear. Low 8. Tuesday..Increasing cloudiness. 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. High 23. UV index 7 or high. Renfrew - Arnprior - Calabogie. Today..Sunny. Fog patches dissipating this morning. High 21. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..A mix of sun and cloud. 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. High 23. UV index 8 or very high. Petawawa - Pembroke - Cobden. Today..Sunny. Fog patches dissipating this morning. High 21. UV index 8 or very high. Tonight..Clear. Low 10. Tuesday..Sunny early in the morning then a mix of sun and cloud with 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. High 23. UV index 8 or very high. Western Algonquin Park - Lake of Two Rivers. Today..Sunny. High 20. UV index 8 or very high. Tonight..Clear. Low 8. Tuesday..Mainly cloudy. 30 percent chance of showers changing to 70 percent chance of showers near noon. High 21. UV index 6 or high. Deep River - Whitney - Eastern Algonquin Park. Today..Sunny. High 20. UV index 8 or very high. Tonight..Clear. Low 8. Tuesday..Mainly cloudy. 30 percent chance of showers changing to 70 percent chance of showers near noon. High 21. UV index 6 or high. Bayfield Inlet - Dunchurch. Today..Sunny. High 22. UV index 8 or very high. Tonight..Clear. Low 12. Tuesday..Mainly cloudy. 30 percent chance of showers changing to 70 percent chance of showers near noon. High 22. UV index 6 or high. South River - Burk's Falls. Today..Sunny. High 20. UV index 8 or very high. Tonight..Clear. Low 8. Tuesday..Mainly cloudy. 30 percent chance of showers changing to 70 percent chance of showers near noon. High 21. UV index 6 or high. End $$$$^^ --- up 6 days, 21 hours, 46 minutes * Origin: Northern Realms (1:229/664) .