Subj : Southern Ontario Weather To : All From : Northern Realms Date : Sun Sep 28 2025 11:05:00 FPCN11 CWTO 281500 Forecasts for Southern Ontario and the National Capital Region issued by Environment Canada at 11:00 a.m. EDT Sunday 28 September 2025 for today and Monday. The next scheduled forecast will be issued at 3:30 p.m. EDT. City of Toronto. Today..Sunny. High 24. Humidex 27. UV index 5 or moderate. Tonight..Clear. Low 10. Monday..Sunny. High 24. Humidex 27. UV index 5 or moderate. Windsor - Leamington - Essex County. Today..Sunny. Wind north 20 km/h. High 26. Humidex 30. UV index 6 or high. Tonight..Clear. Fog patches developing after midnight. Low 10. Monday..Sunny. Fog patches dissipating in the morning. High 26. Humidex 29. UV index 6 or high. Chatham-Kent - Rondeau Park. Today..Sunny. Wind north 20 km/h. High 26. Humidex 30. UV index 6 or high. Tonight..Clear. Fog patches developing after midnight. Low 10. Monday..Sunny. Fog patches dissipating in the morning. High 26. Humidex 29. UV index 6 or high. Sarnia - Petrolia - Western Lambton County. Today..Sunny. Wind north 20 km/h. High 26. Humidex 30. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 25. Humidex 28. UV index 6 or high. Watford - Pinery Park - Eastern Lambton County. Today..Sunny. Wind north 20 km/h. High 26. Humidex 30. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 25. Humidex 28. UV index 6 or high. Rodney - Shedden - Western Elgin County. Today..Sunny. Wind north 20 km/h. High 26. Humidex 30. UV index 6 or high. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 25. Humidex 28. UV index 6 or high. St. Thomas - Aylmer - Eastern Elgin County. Today..Sunny. Wind north 20 km/h. High 26. Humidex 30. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 25. Humidex 28. UV index 6 or high. Strathroy - Komoka - Western Middlesex County. Today..Sunny. Wind north 20 km/h. High 26. Humidex 30. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 25. Humidex 28. UV index 6 or high. London - Parkhill - Eastern Middlesex County. Today..Sunny. Wind north 20 km/h. High 26. Humidex 30. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 25. Humidex 28. UV index 6 or high. Simcoe - Delhi - Norfolk. Today..Sunny. Wind north 20 km/h. High 26. Humidex 30. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 25. Humidex 28. UV index 6 or high. Dunnville - Caledonia - Haldimand. Today..Sunny. Wind north 20 km/h. High 24. Humidex 28. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 10. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 27. UV index 6 or high. Woodstock - Tillsonburg - Oxford County. Today..Sunny. Wind north 20 km/h. High 26. Humidex 30. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 25. Humidex 28. UV index 6 or high. Brantford - County of Brant. Today..Sunny. Wind north 20 km/h. High 26. Humidex 30. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 25. Humidex 28. UV index 6 or high. Niagara Falls - Welland - Southern Niagara Region. Today..Clearing near noon. Wind north 20 km/h. High 24. Humidex 28. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 10. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 27. UV index 6 or high. St. Catharines - Grimsby - Northern Niagara Region. Today..Sunny. Wind north 20 km/h. High 24. Humidex 28. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 10. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 27. UV index 6 or high. City of Hamilton. Today..Sunny. Wind north 20 km/h. High 24. Humidex 28. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 10. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 27. UV index 6 or high. Burlington - Oakville. Today..Sunny. High 24. Humidex 27. UV index 5 or moderate. Tonight..Clear. Low 10. Monday..Sunny. High 24. Humidex 27. UV index 6 or high. Halton Hills - Milton. Today..Sunny. High 24. Humidex 27. UV index 5 or moderate. Tonight..Clear. Low 10. Monday..Sunny. High 24. Humidex 27. UV index 6 or high. Mississauga - Brampton. Today..Sunny. High 24. Humidex 27. UV index 5 or moderate. Tonight..Clear. Low 10. Monday..Sunny. High 24. Humidex 27. UV index 6 or high. Caledon. Today..Sunny. Wind northwest 20 km/h. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 7. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 6 or high. Vaughan - Richmond Hill - Markham. Today..Sunny. High 24. Humidex 27. UV index 5 or moderate. Tonight..Clear. Low 10. Monday..Sunny. High 24. Humidex 27. UV index 6 or high. Newmarket - Georgina - Northern York Region. Today..Sunny. Wind northwest 20 km/h. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 7. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 25. UV index 6 or high. Pickering - Oshawa - Southern Durham Region. Today..Sunny. High 24. Humidex 27. UV index 5 or moderate. Tonight..Clear. Low 10. Monday..Sunny. High 24. Humidex 27. UV index 6 or high. Uxbridge - Beaverton - Northern Durham Region. Today..Sunny. Wind northwest 20 km/h. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 7. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 25. UV index 6 or high. Goderich - Bluewater - Southern Huron County. Today..Sunny. High 23. Humidex 27. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 27. UV index 5 or moderate. Wingham - Blyth - Northern Huron County. Today..Sunny. High 23. Humidex 27. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 27. UV index 5 or moderate. Stratford - Mitchell - Southern Perth County. Today..Sunny. High 23. Humidex 27. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 27. UV index 5 or moderate. Listowel - Milverton - Northern Perth County. Today..Sunny. High 23. Humidex 27. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 27. UV index 5 or moderate. Kitchener - Cambridge - Region of Waterloo. Today..Sunny. High 23. Humidex 27. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 27. UV index 6 or high. Guelph - Erin - Southern Wellington County. Today..Sunny. High 23. Humidex 27. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 27. UV index 6 or high. Mount Forest - Arthur - Northern Wellington County. Today..Sunny. High 23. Humidex 27. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 27. UV index 6 or high. Orangeville - Grand Valley - Southern Dufferin County. Today..Sunny. Wind northwest 20 km/h. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 7. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 6 or high. Shelburne - Mansfield - Northern Dufferin County. Today..Sunny. Wind northwest 20 km/h. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 7. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 6 or high. Innisfil - New Tecumseth - Angus. Today..Sunny. Wind northwest 20 km/h. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 7. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 25. UV index 5 or moderate. Saugeen Shores - Kincardine - Southern Bruce County. Today..Sunny. High 22. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 5 or moderate. Bruce Peninsula - Sauble Beach - Tobermory. Today..Sunny. Wind northwest 20 km/h gusting to 40. High 20. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 9. Monday..Sunny. Fog patches dissipating in the morning. High 21. UV index 5 or moderate. Hanover - Dundalk - Southern Grey County. Today..Sunny. High 22. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 5 or moderate. Owen Sound - Blue Mountains - Northern Grey County. Today..Sunny. High 22. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 5 or moderate. Barrie - Collingwood - Hillsdale. Today..Sunny. Wind northwest 20 km/h. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 7. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 25. UV index 5 or moderate. Midland - Coldwater - Orr Lake. Today..Sunny. Wind northwest 20 km/h. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 7. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 25. UV index 5 or moderate. Orillia - Lagoon City - Washago. Today..Sunny. Wind northwest 20 km/h. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 7. Monday..Sunny. Fog patches dissipating in the morning. High 24. Humidex 25. UV index 5 or moderate. Cobourg - Colborne - Western Northumberland County. Today..Sunny. High 24. Humidex 26. UV index 5 or moderate. Tonight..Clear. Low 10. Monday..Sunny. High 25. Humidex 27. UV index 5 or moderate. Belleville - Quinte West - Eastern Northumberland County. Today..Sunny. High 24. Humidex 26. UV index 5 or moderate. Tonight..Clear. Low 10. Monday..Sunny. High 25. Humidex 27. UV index 5 or moderate. Picton - Sandbanks Park. Today..Clearing near noon. High 24. Humidex 26. UV index 5 or moderate. Tonight..Clear. Low 10. Monday..Sunny. High 25. Humidex 27. UV index 5 or moderate. Napanee - Consecon. Today..Clearing near noon. High 24. Humidex 26. UV index 5 or moderate. Tonight..Clear. Low 10. Monday..Sunny. High 25. Humidex 27. UV index 5 or moderate. Kingston - Odessa - Frontenac Islands. Today..Clearing near noon. High 24. Humidex 26. UV index 5 or moderate. Tonight..Clear. Low 10. Monday..Sunny. High 25. Humidex 27. UV index 5 or moderate. Lindsay - Southern Kawartha Lakes. Today..Sunny. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 6. Monday..Sunny. Fog patches dissipating in the morning. High 25. Humidex 26. UV index 5 or moderate. Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes. Today..Sunny. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 6. Monday..Sunny. Fog patches dissipating in the morning. High 25. Humidex 26. UV index 5 or moderate. Peterborough City - Lakefield - Southern Peterborough County. Today..Sunny. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 6. Monday..Sunny. Fog patches dissipating in the morning. High 25. Humidex 26. UV index 5 or moderate. Apsley - Woodview - Northern Peterborough County. Today..Sunny. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Low 6. Monday..Sunny. High 25. Humidex 26. UV index 5 or moderate. Stirling - Tweed - Madoc. Today..Sunny. High 24. Humidex 26. UV index 5 or moderate. Tonight..Clear. Low 8. Monday..Sunny. High 25. Humidex 27. UV index 5 or moderate. Tamworth - Sydenham - South Frontenac. Today..Sunny. High 24. Humidex 26. UV index 5 or moderate. Tonight..Clear. Low 8. Monday..Sunny. High 25. Humidex 27. UV index 5 or moderate. Kaladar - Bannockburn - Bon Echo Park. Today..Sunny. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Low 6. Monday..Sunny. High 25. Humidex 26. UV index 5 or moderate. Bancroft - Hastings Highlands - Denbigh. Today..Sunny. High 20. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low plus 5. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 5 or moderate. Gananoque - Mallorytown. Today..Clearing near noon. High 24. Humidex 26. UV index 5 or moderate. Tonight..Clear. Low 10. Monday..Sunny. High 25. Humidex 27. UV index 5 or moderate. Brockville - Prescott. Today..Clearing near noon. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 26. Humidex 27. UV index 5 or moderate. Westport - Charleston Lake. Today..Sunny. High 24. Humidex 26. UV index 5 or moderate. Tonight..Clear. Low 8. Monday..Sunny. High 25. Humidex 27. UV index 5 or moderate. Merrickville-Wolford - Kemptville. Today..Sunny. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 26. Humidex 27. UV index 5 or moderate. Ottawa North - Kanata - Orleans. Today..Sunny. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 26. Humidex 27. UV index 5 or moderate. Ottawa South - Richmond - Metcalfe. Today..Sunny. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 26. Humidex 27. UV index 5 or moderate. Gatineau. Today..Sunny. High 23. Humidex 25. UV index 4 or moderate. Tonight..Clear. Fog patches developing overnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 26. Humidex 27. UV index 5 or moderate. Prescott and Russell. Today..Sunny. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 26. Humidex 27. UV index 5 or moderate. Morrisburg - Long Sault. Today..Sunny. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 26. Humidex 27. UV index 5 or moderate. Cornwall - Lancaster. Today..Sunny. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 26. Humidex 27. UV index 5 or moderate. Winchester - Newington. Today..Sunny. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 26. Humidex 27. UV index 5 or moderate. Maxville - Alexandria. Today..Sunny. High 23. Humidex 25. UV index 4 or moderate. Tonight..Clear. Fog patches developing overnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 26. Humidex 27. UV index 5 or moderate. Plevna - Sharbot Lake - Western Lanark County. Today..Sunny. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Low 6. Monday..Sunny. High 25. Humidex 26. UV index 5 or moderate. Smiths Falls - Perth - Eastern Lanark County. Today..Sunny. High 23. Humidex 25. UV index 5 or moderate. Tonight..Clear. Low 6. Monday..Sunny. High 25. Humidex 26. UV index 5 or moderate. Port Carling - Port Severn. Today..Sunny. High 20. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 21. UV index 5 or moderate. Bracebridge - Gravenhurst. Today..Sunny. High 20. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low plus 5. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 5 or moderate. Town of Parry Sound - Rosseau - Killbear Park. Today..Sunny. High 20. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 21. UV index 5 or moderate. Huntsville - Baysville. Today..Sunny. High 20. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low plus 5. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 5 or moderate. Haliburton - Minden - Southern Haliburton County. Today..Sunny. High 20. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low plus 5. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 5 or moderate. Oxtongue Lake - Fort Irwin - Northern Haliburton County. Today..Sunny. High 20. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low plus 5. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 5 or moderate. Barry's Bay - Killaloe. Today..Sunny. High 20. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low plus 5. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 5 or moderate. Renfrew - Arnprior - Calabogie. Today..Sunny. High 21. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low 7. Monday..Sunny. Fog patches dissipating in the morning. High 25. Humidex 26. UV index 5 or moderate. Petawawa - Pembroke - Cobden. Today..Sunny. High 21. UV index 4 or moderate. Tonight..Clear. Fog patches developing overnight. Low 7. Monday..Sunny. Fog patches dissipating in the morning. High 25. Humidex 26. UV index 5 or moderate. Western Algonquin Park - Lake of Two Rivers. Today..Sunny. High 20. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low plus 5. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 5 or moderate. Deep River - Whitney - Eastern Algonquin Park. Today..Sunny. High 20. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low plus 5. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 5 or moderate. Bayfield Inlet - Dunchurch. Today..Sunny. High 20. UV index 5 or moderate. Tonight..Clear. Fog patches developing after midnight. Low 8. Monday..Sunny. Fog patches dissipating in the morning. High 21. UV index 5 or moderate. South River - Burk's Falls. Today..Sunny. High 20. UV index 5 or moderate. Tonight..Clear. Fog patches developing overnight. Low plus 5. Monday..Sunny. Fog patches dissipating in the morning. High 23. UV index 5 or moderate. End $$$$^^ --- up 2 hours, 48 minutes * Origin: Northern Realms (618:400/23) .