Subj : Southern Ontario Weather To : All From : Northern Realms Date : Tue May 27 2025 11:05:02 FPCN11 CWTO 271500 Forecasts for Southern Ontario and the National Capital Region issued by Environment Canada at 11:00 a.m. EDT Tuesday 27 May 2025 for today and Wednesday. The next scheduled forecast will be issued at 3:30 p.m. EDT. City of Toronto. Today..Mainly sunny. High 21. UV index 8 or very high. Tonight..Mainly cloudy. Low 12. Wednesday..Cloudy. 60 percent chance of showers in the afternoon. Wind becoming east 30 km/h late in the morning. High 16 with temperature falling to 12 in the afternoon. UV index 3 or moderate. Windsor - Leamington - Essex County. Today..A mix of sun and cloud. Wind east 20 km/h gusting to 40. High 22. UV index 9 or very high. Tonight..Cloudy. 30 percent chance of showers before morning. Wind east 20 km/h becoming light this evening. Low 12. Wednesday..Cloudy. 30 percent chance of showers early in the morning. Showers beginning in the morning. Wind east 20 km/h. High 16. UV index 3 or moderate. Chatham-Kent - Rondeau Park. Today..A mix of sun and cloud. Wind east 20 km/h gusting to 40. High 20. UV index 9 or very high. Tonight..Mainly cloudy. 30 percent chance of showers before morning. Wind east 20 km/h becoming light this evening. Low 12. Wednesday..Cloudy. 30 percent chance of showers early in the morning. Showers beginning in the morning. Wind becoming east 20 km/h in the morning. High 16. UV index 3 or moderate. Sarnia - Petrolia - Western Lambton County. Today..A mix of sun and cloud. Wind becoming east 20 km/h gusting to 40 then light this afternoon. High 20. UV index 8 or very high. Tonight..Partly cloudy. Low 12. Wednesday..Cloudy. Showers beginning late in the morning. Wind becoming southeast 20 km/h in the morning. High 15. UV index 3 or moderate. Watford - Pinery Park - Eastern Lambton County. Today..A mix of sun and cloud. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 12. Wednesday..Cloudy. Showers beginning late in the morning. Wind becoming southeast 30 km/h in the morning. Temperature steady near 14. UV index 3 or moderate. Rodney - Shedden - Western Elgin County. Today..A mix of sun and cloud. Wind east 20 km/h. High 21. UV index 9 or very high. Tonight..Mainly cloudy. 30 percent chance of showers before morning. Low 12. Wednesday..Cloudy. 30 percent chance of showers early in the morning. Showers beginning in the morning. Wind east 30 km/h. Temperature steady near 13. UV index 3 or moderate. St. Thomas - Aylmer - Eastern Elgin County. Today..A mix of sun and cloud. Wind east 20 km/h gusting to 40. High 21. UV index 9 or very high. Tonight..Mainly cloudy. 30 percent chance of showers before morning. Low 12. Wednesday..Cloudy. 30 percent chance of showers early in the morning. Showers beginning in the morning. Wind east 30 km/h. Temperature steady near 13. UV index 3 or moderate. Strathroy - Komoka - Western Middlesex County. Today..A mix of sun and cloud. Wind southeast 20 km/h gusting to 40. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 12. Wednesday..Cloudy. Showers beginning late in the morning. Wind becoming east 30 km/h in the morning. Temperature steady near 14. UV index 3 or moderate. London - Parkhill - Eastern Middlesex County. Today..A mix of sun and cloud. Wind east 20 km/h gusting to 40. High 22. UV index 8 or very high. Tonight..Partly cloudy. Wind east 20 km/h becoming light this evening. Low 12. Wednesday..Cloudy. Showers beginning late in the morning. Wind becoming east 30 km/h in the morning. Temperature steady near 14. UV index 3 or moderate. Simcoe - Delhi - Norfolk. Today..A mix of sun and cloud. Wind east 20 km/h. High 22. UV index 8 or very high. Tonight..Partly cloudy. 30 percent chance of showers before morning. Wind northeast 20 km/h becoming light early this evening. Low 12. Wednesday..Cloudy. 30 percent chance of showers early in the morning. Showers beginning in the morning. Temperature steady near 13. UV index 3 or moderate. Dunnville - Caledonia - Haldimand. Today..A mix of sun and cloud. Wind becoming east 20 km/h this afternoon. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 12. Wednesday..Cloudy. Showers beginning in the morning. Wind east 20 km/h. Temperature steady near 13. UV index 3 or moderate. Woodstock - Tillsonburg - Oxford County. Today..A mix of sun and cloud. Wind east 20 km/h. High 22. UV index 8 or very high. Tonight..Partly cloudy. Wind east 20 km/h becoming light this evening. Low 12. Wednesday..Cloudy. Showers beginning late in the morning. Wind becoming east 30 km/h in the morning. Temperature steady near 13. UV index 3 or moderate. Brantford - County of Brant. Today..A mix of sun and cloud. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 12. Wednesday..Cloudy. Showers beginning late in the morning. Wind becoming east 30 km/h in the morning. Temperature steady near 13. UV index 3 or moderate. Niagara Falls - Welland - Southern Niagara Region. Today..A mix of sun and cloud. Wind becoming northeast 20 km/h late this afternoon. High 22. UV index 8 or very high. Tonight..Mainly cloudy. Low 12. Wednesday..Cloudy. Showers beginning in the morning. Wind southeast 30 km/h. Temperature steady near 14. UV index 3 or moderate. St. Catharines - Grimsby - Northern Niagara Region. Today..A mix of sun and cloud. High 20 except 15 near Lake Ontario. UV index 8 or very high. Tonight..Partly cloudy. Low 11. Wednesday..Cloudy. Showers beginning in the morning. Wind southeast 30 km/h. Temperature steady near 14. UV index 3 or moderate. City of Hamilton. Today..A mix of sun and cloud. Wind becoming northeast 20 km/h late this afternoon. High 20 except 15 near Lake Ontario. UV index 8 or very high. Tonight..Partly cloudy. Low 11. Wednesday..Cloudy. Showers beginning late in the morning. Wind becoming east 30 km/h in the morning. High 14. UV index 3 or moderate. Burlington - Oakville. Today..A mix of sun and cloud. High 20 except 15 near Lake Ontario. UV index 8 or very high. Tonight..Mainly cloudy. Low 11. Wednesday..Cloudy. Showers beginning near noon. Temperature steady near 12. UV index 3 or moderate. Halton Hills - Milton. Today..A mix of sun and cloud. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 11. Wednesday..Cloudy. Showers beginning near noon. High 14 with temperature falling to 11 in the afternoon. UV index 3 or moderate. Mississauga - Brampton. Today..Mainly sunny. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 12. Wednesday..Cloudy. Showers beginning near noon. Wind becoming east 20 km/h in the afternoon. High 15 with temperature falling to 12 in the afternoon. UV index 3 or moderate. Caledon. Today..Mainly sunny. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 11. Wednesday..Cloudy. 60 percent chance of showers in the afternoon. Wind becoming east 20 km/h in the afternoon. High 15 with temperature falling to 12 in the afternoon. UV index 3 or moderate. Vaughan - Richmond Hill - Markham. Today..Mainly sunny. High 22. UV index 8 or very high. Tonight..Partly cloudy. Low 12. Wednesday..Cloudy. 60 percent chance of showers in the afternoon. High 16. UV index 3 or moderate. Newmarket - Georgina - Northern York Region. Today..Mainly sunny. High 22. UV index 8 or very high. Tonight..Partly cloudy. Low 11. Wednesday..Cloudy. 40 percent chance of showers late in the afternoon. High 16. UV index 3 or moderate. Pickering - Oshawa - Southern Durham Region. Today..Mainly sunny. High 21. UV index 8 or very high. Tonight..Increasing cloudiness early this evening. Low 12. Wednesday..Cloudy. 60 percent chance of showers late in the afternoon. High 16. UV index 3 or moderate. Uxbridge - Beaverton - Northern Durham Region. Today..A mix of sun and cloud. High 22. UV index 8 or very high. Tonight..Increasing cloudiness early this evening. Low 11. Wednesday..Cloudy. 60 percent chance of showers late in the afternoon. High 16. UV index 3 or moderate. Goderich - Bluewater - Southern Huron County. Today..A mix of sun and cloud. High 22. UV index 8 or very high. Tonight..A few clouds. Low 11. Wednesday..Cloudy. Showers beginning near noon. Wind becoming southeast 30 km/h in the morning. High 17. UV index 3 or moderate. Wingham - Blyth - Northern Huron County. Today..Sunny. Becoming a mix of sun and cloud this afternoon. High 22. UV index 8 or very high. Tonight..A few clouds. Low 10. Wednesday..Cloudy. 60 percent chance of showers in the afternoon. Wind becoming southeast 30 km/h in the morning. High 17. UV index 3 or moderate. Stratford - Mitchell - Southern Perth County. Today..A mix of sun and cloud. Wind east 20 km/h. High 22. UV index 8 or very high. Tonight..A few clouds. Wind east 20 km/h becoming light this evening. Low 11. Wednesday..Cloudy. Showers beginning near noon. Wind becoming southeast 30 km/h in the morning. High 17. UV index 3 or moderate. Listowel - Milverton - Northern Perth County. Today..Sunny. Becoming a mix of sun and cloud this afternoon. Wind southeast 20 km/h becoming light near noon. High 22. UV index 8 or very high. Tonight..A few clouds. Low 11. Wednesday..Cloudy. 60 percent chance of showers in the afternoon. Wind becoming southeast 30 km/h in the morning. High 17. UV index 3 or moderate. Kitchener - Cambridge - Region of Waterloo. Today..A mix of sun and cloud. Wind east 20 km/h becoming light near noon. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 11. Wednesday..Cloudy. Showers beginning near noon. Wind becoming east 30 km/h in the morning. High 15 with temperature falling to 11 in the afternoon. UV index 3 or moderate. Guelph - Erin - Southern Wellington County. Today..A mix of sun and cloud. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 11. Wednesday..Cloudy. Showers beginning near noon. Wind becoming east 30 km/h in the morning. High 15 with temperature falling to 11 in the afternoon. UV index 3 or moderate. Mount Forest - Arthur - Northern Wellington County. Today..Sunny. Becoming a mix of sun and cloud this afternoon. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 11. Wednesday..Cloudy. 60 percent chance of showers in the afternoon. Wind becoming southeast 20 km/h in the morning. High 15. UV index 3 or moderate. Orangeville - Grand Valley - Southern Dufferin County. Today..Sunny. Becoming a mix of sun and cloud this afternoon. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 11. Wednesday..Cloudy. 60 percent chance of showers in the afternoon. High 15 with temperature falling to 11 in the afternoon. UV index 3 or moderate. Shelburne - Mansfield - Northern Dufferin County. Today..Sunny. Becoming a mix of sun and cloud this afternoon. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 11. Wednesday..Cloudy. 60 percent chance of showers in the afternoon. High 15 with temperature falling to 11 in the afternoon. UV index 3 or moderate. Innisfil - New Tecumseth - Angus. Today..A mix of sun and cloud. High 22. UV index 8 or very high. Tonight..Partly cloudy. Low 10. Wednesday..Cloudy. 40 percent chance of showers late in the afternoon. Wind becoming southeast 20 km/h in the morning. High 18. UV index 3 or moderate. Saugeen Shores - Kincardine - Southern Bruce County. Today..A mix of sun and cloud. High 21. UV index 8 or very high. Tonight..A few clouds. Low 9. Wednesday..Mainly sunny. Increasing cloudiness near noon then 60 percent chance of showers in the afternoon. High 17. UV index 8 or very high. Bruce Peninsula - Sauble Beach - Tobermory. Today..Sunny. High 20 except 14 near Lake Huron and Georgian Bay. UV index 8 or very high. Tonight..Partly cloudy. Low 8. Wednesday..Mainly sunny. Increasing cloudiness near noon then 40 percent chance of showers late in the afternoon. High 17. UV index 8 or very high. Hanover - Dundalk - Southern Grey County. Today..A mix of sun and cloud. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 9. Wednesday..Cloudy. 60 percent chance of showers in the afternoon. Wind becoming southeast 20 km/h late in the morning. High 18. UV index 3 or moderate. Owen Sound - Blue Mountains - Northern Grey County. Today..Sunny. Becoming a mix of sun and cloud this afternoon. High 20 except 14 near Georgian Bay. UV index 8 or very high. Tonight..Partly cloudy. Low 9. Wednesday..Cloudy. 40 percent chance of showers late in the afternoon. Wind becoming southeast 20 km/h late in the morning. High 18. UV index 3 or moderate. Barrie - Collingwood - Hillsdale. Today..Mainly sunny. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 11. Wednesday..Cloudy. 40 percent chance of showers late in the afternoon. Wind becoming east 20 km/h in the afternoon. High 16. UV index 3 or moderate. Midland - Coldwater - Orr Lake. Today..Mainly sunny. High 21. UV index 8 or very high. Tonight..Partly cloudy. Low 10. Wednesday..Cloudy. 40 percent chance of showers late in the afternoon. Wind becoming southeast 20 km/h late in the afternoon. High 17. UV index 3 or moderate. Orillia - Lagoon City - Washago. Today..Mainly sunny. High 21. UV index 8 or very high. Tonight..Clear. Becoming partly cloudy this evening. Low 10. Wednesday..Cloudy. 30 percent chance of showers late in the afternoon. Wind becoming southeast 20 km/h late in the afternoon. High 17. UV index 3 or moderate. Cobourg - Colborne - Western Northumberland County. Today..Sunny. High 21. UV index 8 or very high. Tonight..Clear. Becoming partly cloudy late this evening. Low 11. Wednesday..Cloudy. 30 percent chance of showers late in the afternoon. High 17. UV index 3 or moderate. Belleville - Quinte West - Eastern Northumberland County. Today..Sunny. High 21. UV index 8 or very high. Tonight..Clear. Becoming partly cloudy late this evening. Low 11. Wednesday..Cloudy. 30 percent chance of showers late in the afternoon. High 17. UV index 3 or moderate. Picton - Sandbanks Park. Today..Sunny. High 19. UV index 8 or very high. Tonight..Clear. Becoming partly cloudy late this evening. Low 10. Wednesday..Overcast. High 17. UV index 3 or moderate. Napanee - Consecon. Today..Sunny. High 21. UV index 8 or very high. Tonight..Clear. Becoming partly cloudy late this evening. Low 11. Wednesday..Overcast. High 18. UV index 3 or moderate. Kingston - Odessa - Frontenac Islands. Today..Sunny. High 19. UV index 8 or very high. Tonight..A few clouds. Low 11. Wednesday..Overcast. High 19. UV index 3 or moderate. Lindsay - Southern Kawartha Lakes. Today..Mainly sunny. High 23. UV index 8 or very high. Tonight..Increasing cloudiness. Low 10. Wednesday..Cloudy. 30 percent chance of showers late in the afternoon. High 18. UV index 3 or moderate. Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes. Today..Mainly sunny. High 23. UV index 8 or very high. Tonight..Clear. Becoming partly cloudy late this evening. Low 10. Wednesday..Cloudy. 30 percent chance of showers late in the afternoon. High 18. UV index 3 or moderate. Peterborough City - Lakefield - Southern Peterborough County. Today..Mainly sunny. High 23. UV index 8 or very high. Tonight..Increasing cloudiness. Low 10. Wednesday..Cloudy. 30 percent chance of showers late in the afternoon. High 18. UV index 3 or moderate. Apsley - Woodview - Northern Peterborough County. Today..Mainly sunny. High 23. UV index 8 or very high. Tonight..Clear. Becoming partly cloudy after midnight. Low 9. Wednesday..Cloudy. 30 percent chance of showers late in the afternoon. High 18. UV index 3 or moderate. Stirling - Tweed - Madoc. Today..Mainly sunny. High 23. UV index 8 or very high. Tonight..A few clouds. Low 10. Wednesday..Overcast. High 18. UV index 3 or moderate. Tamworth - Sydenham - South Frontenac. Today..Sunny. High 23. UV index 8 or very high. Tonight..Clear. Low 10. Wednesday..Overcast. High 21. UV index 3 or moderate. Kaladar - Bannockburn - Bon Echo Park. Today..Mainly sunny. High 23. UV index 8 or very high. Tonight..Clear. Low 8. Wednesday..Overcast. High 20. UV index 3 or moderate. Bancroft - Hastings Highlands - Denbigh. Today..A mix of sun and cloud. High 23. UV index 8 or very high. Tonight..A few clouds. Low 7. Wednesday..Overcast. High 21. UV index 3 or moderate. Gananoque - Mallorytown. Today..Sunny. High 23. UV index 8 or very high. Tonight..Clear. Low 10. Wednesday..Cloudy. High 22. UV index 6 or high. Brockville - Prescott. Today..Sunny. High 24. UV index 8 or very high. Tonight..Clear. Low 10. Wednesday..Cloudy. High 22. UV index 6 or high. Westport - Charleston Lake. Today..Sunny. High 23. UV index 8 or very high. Tonight..Clear. Low 10. Wednesday..Cloudy. High 22. UV index 6 or high. Merrickville-Wolford - Kemptville. Today..Sunny. High 24. UV index 8 or very high. Tonight..Clear. Low 10. Wednesday..Cloudy. High 22. UV index 6 or high. Ottawa North - Kanata - Orl‚ans. Today..Sunny. High 26. UV index 7 or high. Tonight..Clear. Low 10. Wednesday..Cloudy. High 24. Humidex 26. UV index 5 or moderate. Ottawa South - Richmond - Metcalfe. Today..Sunny. High 25. UV index 7 or high. Tonight..Clear. Low 10. Wednesday..Cloudy. High 23. Humidex 25. UV index 5 or moderate. Gatineau. Today..Mainly sunny. High 25. UV index 7 or high. Tonight..Clear. Low 10. Wednesday..Cloudy. High 24. UV index 6 or high. Prescott and Russell. Today..Sunny. High 26. UV index 7 or high. Tonight..Clear. Low 9. Wednesday..A mix of sun and cloud. Becoming cloudy late in the morning. High 23. Humidex 25. UV index 6 or high. Morrisburg - Long Sault. Today..Sunny. High 25. UV index 7 or high. Tonight..Clear. Low 9. Wednesday..Overcast. High 24. UV index 3 or moderate. Cornwall - Lancaster. Today..Sunny. High 26. UV index 7 or high. Tonight..Clear. Low 9. Wednesday..Overcast. High 24. UV index 3 or moderate. Winchester - Newington. Today..Sunny. High 25. UV index 7 or high. Tonight..Clear. Low 9. Wednesday..Overcast. High 24. UV index 3 or moderate. Maxville - Alexandria. Today..Sunny. High 26. UV index 7 or high. Tonight..Clear. Low 9. Wednesday..Overcast. High 24. UV index 3 or moderate. Plevna - Sharbot Lake - Western Lanark County. Today..Mainly sunny. High 23. UV index 8 or very high. Tonight..Clear. Low 9. Wednesday..Overcast. High 21. UV index 3 or moderate. Smiths Falls - Perth - Eastern Lanark County. Today..Sunny. High 24. UV index 8 or very high. Tonight..Clear. Low 10. Wednesday..Overcast. High 23. UV index 3 or moderate. Port Carling - Port Severn. Today..Mainly sunny. High 22. UV index 7 or high. Tonight..Partly cloudy. Low 10. Wednesday..Cloudy. 30 percent chance of showers late in the afternoon. Wind becoming southeast 20 km/h in the afternoon. High 18. UV index 3 or moderate. Bracebridge - Gravenhurst. Today..A mix of sun and cloud. High 23. UV index 7 or high. Tonight..A few clouds. Low 10. Wednesday..Cloudy. 30 percent chance of showers late in the afternoon. Wind becoming southeast 20 km/h in the afternoon. High 18. UV index 3 or moderate. Town of Parry Sound - Rosseau - Killbear Park. Today..A mix of sun and cloud. High 23. UV index 7 or high. Tonight..Clearing this evening. Low 10. Wednesday..Cloudy. 30 percent chance of showers late in the afternoon. Wind becoming southeast 20 km/h in the afternoon. High 18. UV index 3 or moderate. Huntsville - Baysville. Today..Increasing cloudiness late this morning. High 23. UV index 7 or high. Tonight..Partly cloudy. Clearing late this evening. Low 9. Wednesday..Overcast. Wind becoming southeast 20 km/h in the afternoon. High 19. UV index 3 or moderate. Haliburton - Minden - Southern Haliburton County. Today..A mix of sun and cloud. High 22. UV index 8 or very high. Tonight..Clearing this evening. Low 9. Wednesday..Overcast. High 19. UV index 3 or moderate. Oxtongue Lake - Fort Irwin - Northern Haliburton County. Today..Increasing cloudiness late this morning. High 22. UV index 8 or very high. Tonight..Clearing. Low 8. Wednesday..Overcast. High 20. UV index 3 or moderate. Barry's Bay - Killaloe. Today..A mix of sun and cloud. High 23. UV index 7 or high. Tonight..Clear. Low 8. Wednesday..Overcast. High 22. UV index 3 or moderate. Renfrew - Arnprior - Calabogie. Today..Mainly sunny. High 24. UV index 7 or high. Tonight..Clear. Low 9. Wednesday..Overcast. High 22. UV index 3 or moderate. Petawawa - Pembroke - Cobden. Today..Sunny. High 24. UV index 7 or high. Tonight..Clear. Low 8. Wednesday..Overcast. High 22. UV index 3 or moderate. Western Algonquin Park - Lake of Two Rivers. Today..Increasing cloudiness late this morning. High 22. UV index 7 or high. Tonight..Mainly cloudy. Clearing near midnight. Low 7. Wednesday..Cloudy. High 20. UV index 5 or moderate. Deep River - Whitney - Eastern Algonquin Park. Today..Increasing cloudiness late this morning. High 22. UV index 7 or high. Tonight..Mainly cloudy. Clearing late this evening. Low 7. Wednesday..Cloudy. High 21. UV index 5 or moderate. Bayfield Inlet - Dunchurch. Today..Increasing cloudiness late this morning. High 22. UV index 8 or very high. Tonight..Partly cloudy. Clearing after midnight. Low 10. Wednesday..Mainly cloudy. Wind becoming southeast 20 km/h late in the afternoon. High 20. UV index 7 or high. South River - Burk's Falls. Today..Increasing cloudiness late this morning. High 22. UV index 8 or very high. Tonight..Partly cloudy. Clearing after midnight. Low 9. Wednesday..Mainly cloudy. Wind becoming southeast 20 km/h late in the afternoon. High 20. UV index 7 or high. End $$$$^^ --- up 1 week, 5 days, 4 hours, 16 minutes * Origin: Northern Realms (1:229/664) .