Subj : Southern Ontario Weather To : All From : Northern Realms Date : Wed Oct 08 2025 15:35:00 FPCN11 CWTO 081930 Forecasts for Southern Ontario and the National Capital Region issued by Environment Canada at 3:30 p.m. EDT Wednesday 8 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 gusting to 40 becoming light 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. Windsor - Leamington - Essex County. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 3 with risk of frost. Thursday..Sunny. Becoming a mix of sun and cloud in the afternoon. High 16. UV index 5 or moderate. Thursday night..A few clouds. Low plus 4. Chatham-Kent - Rondeau Park. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 2 with patchy frost. Thursday..Sunny. Becoming a mix of sun and cloud near noon. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 3 with risk of frost. Sarnia - Petrolia - Western Lambton County. Tonight..A few clouds. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 2 with patchy frost. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 3 with risk of frost. Watford - Pinery Park - Eastern Lambton County. Tonight..A few clouds. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 2 with patchy frost. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 3 with risk of frost. Rodney - Shedden - Western Elgin County. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 1 with patchy frost. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 2 with patchy frost. St. Thomas - Aylmer - Eastern Elgin County. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 1 with patchy frost. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 2 with patchy frost. Strathroy - Komoka - Western Middlesex County. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 1 with patchy frost. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 2 with patchy frost. London - Parkhill - Eastern Middlesex County. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero with frost. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low zero with frost. Simcoe - Delhi - Norfolk. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero with frost. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1 with patchy frost. Dunnville - Caledonia - Haldimand. Tonight..Clearing early this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 1 with patchy frost. Thursday..Mainly sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1 with patchy frost. Woodstock - Tillsonburg - Oxford County. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero with frost. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low zero with frost. Brantford - County of Brant. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero with frost. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low zero with frost. Niagara Falls - Welland - Southern Niagara Region. Tonight..A few clouds. Wind north 20 km/h gusting to 40 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. St. Catharines - Grimsby - Northern Niagara Region. Tonight..A few clouds. Wind north 20 km/h gusting to 40 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. City of Hamilton. Tonight..Clear. Wind northwest 20 km/h gusting to 40 becoming light this evening. Low plus 2 with patchy frost. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 2 with patchy frost. Burlington - Oakville. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light 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. Halton Hills - Milton. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 2 with patchy frost. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1 with patchy frost. Mississauga - Brampton. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 2 with patchy frost. Thursday..Sunny. High 13. UV index 4 or moderate. Thursday night..Clear. Low plus 2 with patchy frost. Caledon. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 1 with patchy frost. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1 with patchy frost. Vaughan - Richmond Hill - Markham. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 2 with patchy frost. Thursday..Sunny. High 13. UV index 4 or moderate. Thursday night..Clear. Low plus 2 with patchy frost. Newmarket - Georgina - Northern York Region. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero with frost. Thursday..Sunny. High 12. UV index 4 or moderate. Thursday night..Clear. Low zero with frost. Pickering - Oshawa - Southern Durham Region. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 2 with patchy frost. Thursday..Sunny. High 13. UV index 4 or moderate. Thursday night..Clear. Low plus 2 with patchy frost. Uxbridge - Beaverton - Northern Durham Region. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero with frost. Thursday..Sunny. High 12. UV index 4 or moderate. Thursday night..Clear. Low zero with frost. Goderich - Bluewater - Southern Huron County. Tonight..Partly cloudy. Becoming clear this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..Sunny. High 14. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Wingham - Blyth - Northern Huron County. Tonight..A few clouds. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..Sunny. High 14. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Stratford - Mitchell - Southern Perth County. Tonight..Clear. Wind north 20 km/h gusting to 40 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..A few clouds. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low zero. Kitchener - Cambridge - Region of Waterloo. Tonight..Clear. Wind northwest 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low zero. Guelph - Erin - Southern Wellington County. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low zero. Mount Forest - Arthur - Northern Wellington County. Tonight..Partly cloudy. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low zero. Orangeville - Grand Valley - Southern Dufferin County. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low zero. Shelburne - Mansfield - Northern Dufferin County. Tonight..A few clouds. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low zero. Innisfil - New Tecumseth - Angus. Tonight..Clear. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..Sunny. High 12. UV index 4 or moderate. Thursday night..Clear. Low zero. Saugeen Shores - Kincardine - Southern Bruce County. Tonight..A few clouds. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..A mix of sun and cloud. Clearing early in the afternoon. High 14. UV index 4 or moderate. Thursday night..A few clouds. Low plus 1. Bruce Peninsula - Sauble Beach - Tobermory. Tonight..A few clouds. Low plus 3. Thursday..A mix of sun and cloud. High 13. UV index 4 or moderate. Thursday night..Clear. Becoming partly cloudy near midnight. Wind becoming south 20 km/h near midnight. Low plus 4. Hanover - Dundalk - Southern Grey County. Tonight..Partly cloudy. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..Sunny. High 15. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Owen Sound - Blue Mountains - Northern Grey County. Tonight..A few clouds. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..A mix of sun and cloud. Clearing late in the morning. High 14. UV index 4 or moderate. Thursday night..Clear. Becoming partly cloudy after midnight. Low plus 1. Barrie - Collingwood - Hillsdale. Tonight..Partly cloudy. Becoming clear this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..Sunny. High 12. UV index 4 or moderate. Thursday night..Clear. Low zero. Midland - Coldwater - Orr Lake. Tonight..Partly cloudy. Becoming clear this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..Sunny. High 12. UV index 4 or moderate. Thursday night..Clear. Low zero. Orillia - Lagoon City - Washago. Tonight..Partly cloudy. Becoming clear this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low zero. Thursday..Sunny. High 12. UV index 4 or moderate. Thursday night..Clear. Low zero. Cobourg - Colborne - Western Northumberland County. Tonight..Clearing early this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 1 with patchy frost. Thursday..Sunny. High 13. UV index 4 or moderate. Thursday night..Clear. Low zero with frost. Belleville - Quinte West - Eastern Northumberland County. Tonight..Clearing early this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 1 with patchy frost. Thursday..Sunny. High 13. UV index 4 or moderate. Thursday night..Clear. Low zero with frost. Picton - Sandbanks Park. Tonight..Clearing early this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 2 with patchy frost. Thursday..Sunny. High 13. UV index 4 or moderate. Thursday night..Clear. Low zero with frost. Napanee - Consecon. Tonight..Clearing early this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 2 with patchy frost. Thursday..Sunny. High 13. UV index 4 or moderate. Thursday night..Clear. Low zero with frost. Kingston - Odessa - Frontenac Islands. Tonight..Clearing. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 2 with patchy frost. Thursday..Sunny. High 13. UV index 4 or moderate. Thursday night..Clear. Low zero with frost. Lindsay - Southern Kawartha Lakes. Tonight..Clearing early this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low minus 1. Thursday..Sunny. High 12. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes. Tonight..Clearing early this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low minus 2. Wind chill minus 5 overnight. Thursday..Sunny. Wind up to 15 km/h. High 12. Wind chill minus 3 in the morning. UV index 4 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Peterborough City - Lakefield - Southern Peterborough County. Tonight..Clearing early this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low minus 1. Thursday..Sunny. High 12. UV index 4 or moderate. Thursday night..Clear. Low minus 1. Apsley - Woodview - Northern Peterborough County. Tonight..Clearing early this evening. Wind north 20 km/h becoming light early this evening. Low minus 2. Wind chill minus 5 overnight. Thursday..Sunny. Wind up to 15 km/h. High 12. Wind chill minus 3 in the morning. UV index 3 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Stirling - Tweed - Madoc. Tonight..Clearing early this evening. Wind north 20 km/h becoming light early this evening. Low minus 1. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Tamworth - Sydenham - South Frontenac. Tonight..Clearing. Wind north 20 km/h becoming light early this evening. Low minus 1. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Kaladar - Bannockburn - Bon Echo Park. Tonight..Clearing early this evening. Wind north 20 km/h becoming light early this evening. Low minus 2. Wind chill minus 5 overnight. Thursday..Sunny. Wind up to 15 km/h. High 12. Wind chill minus 3 in the morning. UV index 3 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Bancroft - Hastings Highlands - Denbigh. Tonight..Clearing early this evening. Wind up to 15 km/h. Low minus 4. Wind chill minus 6 overnight. Thursday..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 in the morning. UV index 3 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 3. Wind chill minus 5 overnight. Gananoque - Mallorytown. Tonight..Clearing. Wind north 20 km/h becoming light early this evening. Low plus 2 with patchy frost. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low zero with frost. Brockville - Prescott. Tonight..Mainly cloudy. Clearing this evening. Wind north 20 km/h becoming light early this evening. Low plus 2 with patchy frost. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low zero with frost. Westport - Charleston Lake. Tonight..Clearing early this evening. Wind north 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Merrickville-Wolford - Kemptville. Tonight..Clearing. Wind north 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Ottawa North - Kanata - Orl‚ans. Tonight..Clearing. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 1. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Ottawa South - Richmond - Metcalfe. Tonight..Clearing. Wind north 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Gatineau. Tonight..Clearing. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 1. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Prescott and Russell. Tonight..Clearing. Wind north 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Morrisburg - Long Sault. Tonight..Clearing. Wind north 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Cornwall - Lancaster. Tonight..Mainly cloudy. Clearing this evening. Wind north 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Winchester - Newington. Tonight..Clearing. Wind north 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Maxville - Alexandria. Tonight..Clearing. Wind northwest 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Plevna - Sharbot Lake - Western Lanark County. Tonight..Clearing early this evening. Wind north 20 km/h becoming light early this evening. Low minus 2. Wind chill minus 5 overnight. Thursday..Sunny. Wind up to 15 km/h. High 12. Wind chill minus 3 in the morning. UV index 3 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Smiths Falls - Perth - Eastern Lanark County. Tonight..Clearing. Wind north 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Port Carling - Port Severn. Tonight..Clearing early this evening. Wind north 20 km/h becoming light this evening. Low plus 1. Thursday..Sunny. High 12. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Bracebridge - Gravenhurst. Tonight..Clearing early this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low minus 4. Wind chill minus 6 overnight. Thursday..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 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. Town of Parry Sound - Rosseau - Killbear Park. Tonight..Clearing early this evening. Wind north 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. High 12. UV index 4 or moderate. Thursday night..Clear. Low plus 1. Huntsville - Baysville. Tonight..Clearing early this evening. Wind up to 15 km/h. Low minus 4. Wind chill minus 6 overnight. Thursday..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 in the morning. UV index 3 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 3. Wind chill minus 5 overnight. Haliburton - Minden - Southern Haliburton County. Tonight..Clearing early this evening. Wind up to 15 km/h. Low minus 4. Wind chill minus 6 overnight. Thursday..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 in the morning. UV index 3 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 3. Wind chill minus 5 overnight. Oxtongue Lake - Fort Irwin - Northern Haliburton County. Tonight..Clearing early this evening. Wind up to 15 km/h. Low minus 4. Wind chill minus 6 overnight. Thursday..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 in the morning. UV index 3 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 3. Wind chill minus 5 overnight. Barry's Bay - Killaloe. Tonight..Partly cloudy with 30 percent chance of showers early this evening. Clearing this evening. Wind up to 15 km/h. Low minus 4. Wind chill minus 6 overnight. Thursday..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 in the morning. UV index 3 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 3. Wind chill minus 5 overnight. Renfrew - Arnprior - Calabogie. Tonight..Partly cloudy with 30 percent chance of showers early this evening. Clearing this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low minus 2. Wind chill minus 5 overnight. Thursday..Sunny. Wind up to 15 km/h. High 12. Wind chill minus 3 in the morning. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Petawawa - Pembroke - Cobden. Tonight..Partly cloudy. 30 percent chance of showers early this evening. Wind north 20 km/h gusting to 40 becoming light this evening. Low minus 2. Wind chill minus 5 overnight. Thursday..Sunny. Wind up to 15 km/h. High 12. Wind chill minus 3 in the morning. UV index 3 or moderate. Thursday night..Clear. Low minus 1. Western Algonquin Park - Lake of Two Rivers. Tonight..Clearing early this evening. Wind up to 15 km/h. Low minus 4. Wind chill minus 6 overnight. Thursday..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 in the morning. UV index 3 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 3. Wind chill minus 5 overnight. Deep River - Whitney - Eastern Algonquin Park. Tonight..Partly cloudy with 30 percent chance of showers early this evening. Clearing this evening. Wind up to 15 km/h. Low minus 4. Wind chill minus 6 overnight. Thursday..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 in the morning. UV index 3 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 3. Wind chill minus 5 overnight. Bayfield Inlet - Dunchurch. Tonight..Clearing early this evening. Wind north 20 km/h becoming light early this evening. Low plus 1. Thursday..Sunny. High 12. UV index 3 or moderate. Thursday night..Clear. Low plus 1. South River - Burk's Falls. Tonight..Clearing early this evening. Wind up to 15 km/h. Low minus 4. Wind chill minus 6 overnight. Thursday..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 in the morning. UV index 3 or moderate. Thursday night..Clear. Wind up to 15 km/h. Low minus 3. Wind chill minus 5 overnight. End $$$$^^ --- up 2 days, 23 hours, 16 minutes * Origin: Northern Realms (1:229/664) .