Subj : Southern Ontario Weather To : All From : Northern Realms Date : Wed Oct 15 2025 15:35:00 FPCN11 CWTO 151930 Forecasts for Southern Ontario and the National Capital Region issued by Environment Canada at 3:30 p.m. EDT Wednesday 15 October 2025 for tonight Thursday and Thursday night. The next scheduled forecast will be issued at 5:00 a.m. EDT Thursday. City of Toronto. Tonight..Clear. Wind north 20 km/h becoming light late this evening. Low plus 4. Thursday..Sunny. Wind becoming north 20 km/h late in the morning. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 3 with risk of frost. Windsor - Leamington - Essex County. Tonight..Clearing. Low plus 4. Thursday..Mainly sunny. High 16. UV index 5 or moderate. Thursday night..Clear. Becoming partly cloudy before morning. Low plus 5. Chatham-Kent - Rondeau Park. Tonight..Clear. Wind north 30 km/h becoming light this evening. Low plus 2 with risk of frost. Thursday..Sunny. High 16. UV index 4 or moderate. Thursday night..Clear. Low plus 2 with risk of frost. Sarnia - Petrolia - Western Lambton County. Tonight..Clearing early this evening. Wind north 30 km/h becoming light late this evening. Low plus 2. Thursday..A mix of sun and cloud. Clearing late in the morning. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 3. Watford - Pinery Park - Eastern Lambton County. Tonight..Clear. Wind north 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. Wind north 20 km/h becoming light late in the morning. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Rodney - Shedden - Western Elgin County. Tonight..Clear. Wind north 20 km/h becoming light this evening. Low plus 1. Thursday..Sunny. Wind becoming north 20 km/h late in the morning. High 16. UV index 4 or moderate. Thursday night..Clear. Low plus 1. St. Thomas - Aylmer - Eastern Elgin County. Tonight..Clear. Wind north 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. Wind becoming northwest 20 km/h late in the morning. High 16. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Strathroy - Komoka - Western Middlesex County. Tonight..Clear. Wind north 20 km/h becoming light this evening. Low plus 1. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1. London - Parkhill - Eastern Middlesex County. Tonight..Clear. Wind north 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Simcoe - Delhi - Norfolk. Tonight..Clear. Low zero. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Dunnville - Caledonia - Haldimand. Tonight..Clear. Low zero. Thursday..Sunny. High 14. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Woodstock - Tillsonburg - Oxford County. Tonight..Clear. Low zero. Thursday..Sunny. Wind becoming north 20 km/h late in the morning. High 15. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Brantford - County of Brant. Tonight..Clear. Low zero. Thursday..Sunny. Wind becoming northwest 20 km/h in the afternoon. High 15. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Niagara Falls - Welland - Southern Niagara Region. Tonight..Clear. Wind north 20 km/h becoming light early this evening. Low plus 3 with risk of frost. Thursday..Sunny. High 13. UV index 4 or moderate. Thursday night..Clear. Low plus 3 with risk of frost. St. Catharines - Grimsby - Northern Niagara Region. Tonight..Clear. Low plus 5. Thursday..Sunny. Wind north 20 km/h becoming light late in the morning. High 13. UV index 4 or moderate. Thursday night..Clear. Low plus 4. City of Hamilton. Tonight..Clear. Low plus 2. Thursday..Sunny. Wind north 20 km/h becoming light in the afternoon. High 14. UV index 4 or moderate. Thursday night..Clear. Low plus 2. Burlington - Oakville. Tonight..Clear. Low plus 3 with risk of frost. Thursday..Sunny. Wind becoming northeast 20 km/h in the afternoon. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 3 with risk of frost. Halton Hills - Milton. Tonight..Clear. Wind north 20 km/h becoming light early this evening. Low plus 2. Thursday..Sunny. Wind becoming north 20 km/h in the morning. High 14. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Mississauga - Brampton. Tonight..Clear. Wind north 20 km/h becoming light this evening. Low plus 3 with risk of frost. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 3 with risk of frost. Caledon. Tonight..Clear. Wind north 20 km/h becoming light this evening. Low plus 1. Thursday..Sunny. Wind north 20 km/h becoming light in the afternoon. High 14. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Vaughan - Richmond Hill - Markham. Tonight..Clear. Wind northwest 20 km/h becoming light this evening. Low plus 3. Thursday..Sunny. Wind becoming north 20 km/h in the morning. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 2. Newmarket - Georgina - Northern York Region. Tonight..Clear. Wind northwest 20 km/h becoming light this evening. Low zero. Thursday..Sunny. Wind becoming north 20 km/h in the morning. High 15. UV index 4 or moderate. Thursday night..Clear. Low zero. Pickering - Oshawa - Southern Durham Region. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. Wind becoming north 20 km/h in the morning. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Uxbridge - Beaverton - Northern Durham Region. Tonight..Clear. Wind northwest 20 km/h becoming light this evening. Low zero. Thursday..Sunny. Wind becoming northwest 20 km/h late in the morning. High 15. UV index 4 or moderate. Thursday night..Clear. Low zero. Goderich - Bluewater - Southern Huron County. Tonight..Clear. Wind north 30 km/h becoming light this evening. Low zero. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Becoming partly cloudy before morning. Low plus 1. Wingham - Blyth - Northern Huron County. Tonight..Clear. Wind north 20 km/h becoming light early this evening. Low zero. Thursday..Sunny. Wind becoming north 20 km/h late in the morning. High 15. UV index 4 or moderate. Thursday night..Clear. Becoming partly cloudy before morning. Low plus 1. Stratford - Mitchell - Southern Perth County. Tonight..Clear. Wind north 20 km/h becoming light this evening. Low zero. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low zero. Listowel - Milverton - Northern Perth County. Tonight..Clear. Wind north 20 km/h becoming light early this evening. Low zero. Thursday..Sunny. Wind north 20 km/h becoming light in the afternoon. High 15. UV index 4 or moderate. Thursday night..Clear. Low zero. Kitchener - Cambridge - Region of Waterloo. Tonight..Clear. Wind north 20 km/h becoming light this evening. Low zero. Thursday..Sunny. Wind north 20 km/h becoming light in the afternoon. High 14. UV index 4 or moderate. Thursday night..Clear. Low zero. Guelph - Erin - Southern Wellington County. Tonight..Clear. Low zero. Thursday..Sunny. Wind north 20 km/h becoming light late in the morning. High 14. UV index 4 or moderate. Thursday night..Clear. Low zero. Mount Forest - Arthur - Northern Wellington County. Tonight..Clear. Wind north 20 km/h becoming light early this evening. Low zero. Thursday..Sunny. Wind north 20 km/h becoming light late in the morning. High 14. UV index 4 or moderate. Thursday night..Clear. Low zero. Orangeville - Grand Valley - Southern Dufferin County. Tonight..Clear. Wind northwest 20 km/h becoming light this evening. Low zero. Thursday..Sunny. Wind north 20 km/h becoming light in the afternoon. High 13. UV index 4 or moderate. Thursday night..Clear. Low zero. Shelburne - Mansfield - Northern Dufferin County. Tonight..Clear. Low zero. Thursday..Sunny. Wind north 20 km/h becoming light in the afternoon. High 13. UV index 4 or moderate. Thursday night..Clear. Low zero. Innisfil - New Tecumseth - Angus. Tonight..Clear. Wind northwest 20 km/h becoming light this evening. Low zero. Thursday..Sunny. Wind becoming northwest 20 km/h late in the morning. High 13. UV index 4 or moderate. Thursday night..Clear. Becoming partly cloudy before morning. Low zero. Saugeen Shores - Kincardine - Southern Bruce County. Tonight..Clear. Wind north 20 km/h becoming light this evening. Low zero. Thursday..Sunny. High 14. UV index 4 or moderate. Thursday night..Clear. Increasing cloudiness overnight. Low plus 1. Bruce Peninsula - Sauble Beach - Tobermory. Tonight..Clear. Low plus 3. Thursday..Sunny. High 14. UV index 4 or moderate. Thursday night..Clear. Increasing cloudiness after midnight. Low plus 3. Hanover - Dundalk - Southern Grey County. Tonight..Clear. Low zero. Thursday..Sunny. Wind becoming north 20 km/h late in the morning. High 13. UV index 4 or moderate. Thursday night..A few clouds. Low zero. Owen Sound - Blue Mountains - Northern Grey County. Tonight..Clear. Low zero. Thursday..Sunny. High 13. UV index 4 or moderate. Thursday night..Clear. Increasing cloudiness after midnight. Low plus 2. Barrie - Collingwood - Hillsdale. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low zero. Thursday..Sunny. Wind becoming northwest 20 km/h late in the morning. High 13. UV index 4 or moderate. Thursday night..Clear. Becoming partly cloudy before morning. Low plus 1. Midland - Coldwater - Orr Lake. Tonight..Clear. Wind north 30 km/h becoming light after midnight. Low plus 1. Thursday..Sunny. High 13. UV index 4 or moderate. Thursday night..Clear. Becoming partly cloudy before morning. Low plus 1. Orillia - Lagoon City - Washago. Tonight..Clear. Wind northwest 30 km/h becoming light late this evening. Low zero. Thursday..Sunny. Wind becoming northwest 30 km/h late in the morning. High 13. UV index 4 or moderate. Thursday night..Clear. Becoming partly cloudy before morning. Wind northwest 30 km/h becoming light in the evening. Low plus 1. Cobourg - Colborne - Western Northumberland County. Tonight..Clear. Low zero. Thursday..Sunny. Wind becoming northwest 20 km/h late in the morning. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Belleville - Quinte West - Eastern Northumberland County. Tonight..Clear. Low zero. Thursday..Sunny. Wind becoming northwest 20 km/h late in the morning. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Picton - Sandbanks Park. Tonight..Clear. Low plus 1. Thursday..Sunny. Wind becoming northwest 20 km/h late in the morning. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Napanee - Consecon. Tonight..Clear. Low zero. Thursday..Sunny. Wind becoming northwest 20 km/h late in the morning. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Kingston - Odessa - Frontenac Islands. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. Wind becoming north 20 km/h gusting to 40 in the morning. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Lindsay - Southern Kawartha Lakes. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low minus 1. Thursday..Sunny. Wind becoming northwest 20 km/h late in the morning. High 14. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low minus 1. Thursday..Sunny. High 14. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Peterborough City - Lakefield - Southern Peterborough County. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low minus 2. Thursday..Sunny. Wind becoming northwest 20 km/h in the afternoon. High 14. Wind chill minus 5 in the morning. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Apsley - Woodview - Northern Peterborough County. Tonight..Clear. Low minus 2. Thursday..Sunny. Wind becoming northwest 20 km/h in the afternoon. High 14. Wind chill minus 5 in the morning. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Stirling - Tweed - Madoc. Tonight..Clear. Wind north 20 km/h becoming light early this evening. Low zero. Thursday..Sunny. Wind becoming north 20 km/h in the morning. High 13. UV index 4 or moderate. Thursday night..Clear. Low zero. Tamworth - Sydenham - South Frontenac. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low zero. Thursday..Sunny. Wind becoming north 20 km/h gusting to 40 in the morning. High 13. UV index 4 or moderate. Thursday night..Clear. Low zero. Kaladar - Bannockburn - Bon Echo Park. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low minus 1. Wind chill minus 5 overnight. Thursday..Sunny. Wind becoming north 20 km/h gusting to 40 in the morning. High 13. Wind chill minus 7 in the morning. UV index 4 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 3. Wind chill minus 7 overnight. Bancroft - Hastings Highlands - Denbigh. Tonight..Clear. Wind northwest 20 km/h becoming light this evening. Low minus 3. Wind chill minus 6 overnight. Thursday..Sunny. Wind becoming north 20 km/h in the morning. High 12. Wind chill minus 9 in the morning. UV index 4 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 3. Wind chill minus 5 overnight. Gananoque - Mallorytown. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low plus 2. Thursday..Sunny. Wind becoming north 20 km/h gusting to 40 in the morning. High 13. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Brockville - Prescott. Tonight..Clear. Wind north 20 km/h becoming light early this evening. Low plus 2. Thursday..Sunny. Wind becoming northwest 20 km/h gusting to 40 in the morning. High 13. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Westport - Charleston Lake. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low plus 2. Thursday..Sunny. Wind becoming north 20 km/h gusting to 40 in the morning. High 13. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Merrickville-Wolford - Kemptville. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low plus 2. Thursday..Sunny. Wind becoming northwest 20 km/h gusting to 40 in the morning. High 13. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Ottawa North - Kanata - Orl‚ans. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. Wind becoming northwest 20 km/h gusting to 40 in the morning. High 13. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Ottawa South - Richmond - Metcalfe. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. Wind becoming northwest 20 km/h gusting to 40 in the morning. High 13. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Gatineau. Tonight..Clear. Wind northwest 20 km/h gusting to 40 becoming light early this evening. Low plus 2. Thursday..Sunny. Wind becoming northwest 20 km/h gusting to 40 in the morning. High 14. UV index 3 or moderate. Thursday night..Clear. Low plus 1. Prescott and Russell. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. Wind becoming northwest 20 km/h gusting to 40 in the morning. High 13. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Morrisburg - Long Sault. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low zero. Thursday..Sunny. Wind becoming northwest 20 km/h gusting to 40 in the morning. High 13. UV index 3 or moderate. Thursday night..Clear. Wind north 20 km/h becoming light in the evening. Low minus 2. Wind chill minus 4 overnight. Cornwall - Lancaster. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low zero. Thursday..Sunny. Wind becoming northwest 20 km/h gusting to 40 in the morning. High 13. UV index 3 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 5 overnight. Winchester - Newington. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low zero. Thursday..Sunny. Wind becoming northwest 20 km/h gusting to 40 in the morning. High 13. UV index 3 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 5 overnight. Maxville - Alexandria. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low zero. Thursday..Sunny. Wind becoming northwest 30 km/h gusting to 50 in the morning. High 13. UV index 3 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Plevna - Sharbot Lake - Western Lanark County. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. Wind becoming north 20 km/h in the morning. High 12. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Smiths Falls - Perth - Eastern Lanark County. Tonight..Clear. Wind northwest 20 km/h gusting to 40 becoming light early this evening. Low plus 1. Thursday..Sunny. Wind becoming northwest 20 km/h gusting to 40 in the morning. High 12. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Port Carling - Port Severn. Tonight..Clear. Wind northwest 30 km/h becoming light this evening. Low zero. Thursday..Sunny. Wind becoming northwest 20 km/h in the afternoon. High 13. UV index 4 or moderate. Thursday night..Clear. Becoming partly cloudy before morning. Wind northwest 20 km/h becoming light in the evening. Low plus 1. Bracebridge - Gravenhurst. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low minus 1. Wind chill minus 3 overnight. Thursday..Sunny. Wind becoming northwest 20 km/h late in the morning. High 13. Wind chill minus 3 in the morning. UV index 4 or moderate. Thursday night..Clear. Becoming partly cloudy overnight. Low zero. Town of Parry Sound - Rosseau - Killbear Park. Tonight..Clear. Wind north 20 km/h becoming light early this evening. Low minus 1. Thursday..Sunny. Wind becoming north 20 km/h in the afternoon. High 14. UV index 4 or moderate. Thursday night..Clear. Increasing cloudiness after midnight. Low plus 1. Huntsville - Baysville. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 5 overnight. Thursday..Sunny. Wind becoming north 20 km/h late in the morning. High 14. Wind chill minus 4 in the morning. UV index 4 or moderate. Thursday night..Clear. Low zero. Haliburton - Minden - Southern Haliburton County. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low minus 3. Thursday..Sunny. Wind becoming north 20 km/h late in the morning. High 12. Wind chill minus 5 in the morning. UV index 4 or moderate. Thursday night..Clear. Low minus 2. Oxtongue Lake - Fort Irwin - Northern Haliburton County. Tonight..Clear. Wind up to 15 km/h. Low minus 3. Wind chill minus 6 overnight. Thursday..Sunny. Wind north 20 km/h becoming light in the afternoon. High 12. Wind chill minus 9 in the morning. UV index 4 or moderate. Thursday night..Clear. Low minus 2. Barry's Bay - Killaloe. Tonight..Clear. Wind northwest 20 km/h becoming light this evening. Low minus 2. Wind chill minus 6 overnight. Thursday..Sunny. Wind becoming northwest 20 km/h in the morning. High 13. Wind chill minus 8 in the morning. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Renfrew - Arnprior - Calabogie. Tonight..Clear. Wind northwest 20 km/h becoming light this evening. Low zero. Thursday..Sunny. Wind becoming northwest 20 km/h late in the morning. High 13. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Petawawa - Pembroke - Cobden. Tonight..Clear. Wind northwest 30 km/h becoming light late this evening. Low zero. Thursday..Sunny. Wind becoming northwest 30 km/h late in the morning. High 13. UV index 4 or moderate. Thursday night..Clear. Wind north 20 km/h becoming light in the evening. Low plus 1. Western Algonquin Park - Lake of Two Rivers. Tonight..Clear. Wind northwest 20 km/h becoming light this evening. Low minus 3. Wind chill minus 7 overnight. Thursday..Sunny. Wind becoming northwest 20 km/h in the morning. High 11. Wind chill minus 9 in the morning. UV index 4 or moderate. Thursday night..Clear. Low minus 3. Deep River - Whitney - Eastern Algonquin Park. Tonight..Clear. Wind northwest 20 km/h becoming light this evening. Low minus 3. Wind chill minus 6 overnight. Thursday..Sunny. Wind north 20 km/h becoming light in the afternoon. High 11. Wind chill minus 9 in the morning. UV index 4 or moderate. Thursday night..Clear. Low minus 3. Bayfield Inlet - Dunchurch. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low minus 2. Thursday..Sunny. Wind becoming north 20 km/h late in the morning. High 13. Wind chill minus 4 in the morning. UV index 4 or moderate. Thursday night..Clear. Low plus 1. South River - Burk's Falls. Tonight..Clear. Wind northwest 20 km/h becoming light early this evening. Low minus 2. Thursday..Sunny. Wind becoming north 20 km/h late in the morning. High 13. Wind chill minus 4 in the morning. UV index 4 or moderate. Thursday night..Clear. Low zero. End $$$$^^ --- up 17 hours, 31 minutes * Origin: Northern Realms (618:400/23) .