Subj : Southern Ontario Weather To : All From : Northern Realms Date : Thu Oct 09 2025 05:05:00 FPCN11 CWTO 090900 Forecasts for Southern Ontario and the National Capital Region issued by Environment Canada at 5:00 a.m. EDT Thursday 9 October 2025 for today and Friday. The next scheduled forecast will be issued at 11:00 a.m. EDT. City of Toronto. Today..Sunny. High 13. UV index 4 or moderate. Tonight..Clear. Low plus 3 with risk of frost. Friday..Mainly sunny. High 17. UV index 4 or moderate. Windsor - Leamington - Essex County. Today..Sunny. High 16. UV index 5 or moderate. Tonight..Partly cloudy. Fog patches developing overnight. Low plus 3 with risk of frost. Friday..Sunny. Fog patches dissipating in the morning. Wind becoming southwest 20 km/h gusting to 40 near noon. High 18. UV index 4 or moderate. Chatham-Kent - Rondeau Park. Today..Sunny. Becoming a mix of sun and cloud this afternoon. High 15. UV index 5 or moderate. Tonight..A few clouds. Fog patches developing overnight. Low plus 2 with patchy frost. Friday..A mix of sun and cloud. Becoming sunny late in the morning. Fog patches dissipating in the morning. Wind becoming southwest 20 km/h gusting to 40 near noon. High 18. UV index 4 or moderate. Sarnia - Petrolia - Western Lambton County. Today..Sunny. High 15. UV index 4 or moderate. Tonight..Clear. Fog patches developing overnight. Low plus 2 with patchy frost. Friday..Mainly sunny. Fog patches dissipating in the morning. Wind becoming southwest 20 km/h gusting to 40 near noon. High 18. UV index 4 or moderate. Watford - Pinery Park - Eastern Lambton County. Today..Sunny. Becoming a mix of sun and cloud near noon. High 15. UV index 4 or moderate. Tonight..Clear. Fog patches developing overnight. Low plus 2 with patchy frost. Friday..Mainly sunny. Fog patches dissipating in the morning. Wind becoming southwest 20 km/h gusting to 40 near noon. High 18. UV index 4 or moderate. Rodney - Shedden - Western Elgin County. Today..Sunny. Becoming a mix of sun and cloud this afternoon. High 15. UV index 5 or moderate. Tonight..A few clouds. Low plus 1 with patchy frost. Friday..A mix of sun and cloud. Clearing early in the afternoon. Wind becoming southwest 20 km/h gusting to 40 near noon. High 17. UV index 4 or moderate. St. Thomas - Aylmer - Eastern Elgin County. Today..Mainly sunny. High 15. UV index 5 or moderate. Tonight..Clear. Low plus 1 with patchy frost. Friday..A mix of sun and cloud. Clearing in the afternoon. Wind becoming southwest 20 km/h gusting to 40 near noon. High 17. UV index 4 or moderate. Strathroy - Komoka - Western Middlesex County. Today..Sunny. High 15. UV index 4 or moderate. Tonight..Clear. Low plus 1 with patchy frost. Friday..A mix of sun and cloud. Clearing in the afternoon. Wind becoming southwest 20 km/h gusting to 40 near noon. High 17. UV index 4 or moderate. London - Parkhill - Eastern Middlesex County. Today..Mainly sunny. High 14. UV index 4 or moderate. Tonight..Clear. Low zero with frost. Friday..A mix of sun and cloud. Clearing late in the afternoon. Wind becoming southwest 20 km/h gusting to 40 near noon. High 17. UV index 4 or moderate. Simcoe - Delhi - Norfolk. Today..Sunny. Becoming a mix of sun and cloud near noon. High 14. UV index 4 or moderate. Tonight..Clear. Low plus 1 with patchy frost. Friday..Mainly sunny. Wind becoming southwest 20 km/h gusting to 40 near noon. High 17. UV index 4 or moderate. Dunnville - Caledonia - Haldimand. Today..Sunny. Becoming a mix of sun and cloud near noon. High 14. UV index 4 or moderate. Tonight..Clear. Low plus 1 with patchy frost. Friday..Mainly sunny. Wind becoming southwest 20 km/h gusting to 40 near noon. High 17. UV index 4 or moderate. Woodstock - Tillsonburg - Oxford County. Today..Sunny. Becoming a mix of sun and cloud near noon. High 14. UV index 4 or moderate. Tonight..Clear. Low zero with frost. Friday..Mainly sunny. Wind becoming southwest 20 km/h gusting to 40 near noon. High 17. UV index 4 or moderate. Brantford - County of Brant. Today..Sunny. Becoming a mix of sun and cloud near noon. High 14. UV index 4 or moderate. Tonight..Clear. Low zero with frost. Friday..Mainly sunny. Wind becoming southwest 20 km/h gusting to 40 near noon. High 17. UV index 4 or moderate. Niagara Falls - Welland - Southern Niagara Region. Today..Mainly sunny. Wind becoming northeast 20 km/h this morning. High 13. UV index 4 or moderate. Tonight..Clear. Low plus 3 with risk of frost. Friday..Sunny. Wind becoming southwest 20 km/h near noon. High 18. UV index 4 or moderate. St. Catharines - Grimsby - Northern Niagara Region. Today..A mix of sun and cloud. Clearing near noon. Wind becoming northeast 20 km/h this morning. High 13. UV index 4 or moderate. Tonight..Clear. Low plus 3 with risk of frost. Friday..Sunny. Wind becoming southwest 20 km/h near noon. High 18. UV index 4 or moderate. City of Hamilton. Today..Mainly sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low plus 2 with patchy frost. Friday..Mainly sunny. High 17. UV index 4 or moderate. Burlington - Oakville. Today..Sunny. High 13. UV index 4 or moderate. Tonight..Clear. Low plus 3 with risk of frost. Friday..Mainly sunny. High 17. UV index 4 or moderate. Halton Hills - Milton. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low plus 2 with patchy frost. Friday..Mainly sunny. High 17. UV index 4 or moderate. Mississauga - Brampton. Today..Sunny. High 13. UV index 4 or moderate. Tonight..Clear. Low plus 3 with risk of frost. Friday..Mainly sunny. High 17. UV index 4 or moderate. Caledon. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low plus 2 with patchy frost. Friday..Sunny. Becoming a mix of sun and cloud late in the morning. High 17. UV index 4 or moderate. Vaughan - Richmond Hill - Markham. Today..Sunny. High 13. UV index 4 or moderate. Tonight..Clear. Low plus 2 with patchy frost. Friday..Sunny. Becoming a mix of sun and cloud in the morning. High 17. UV index 4 or moderate. Newmarket - Georgina - Northern York Region. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low zero with frost. Friday..Mainly sunny. Wind becoming south 20 km/h near noon. High 17. UV index 4 or moderate. Pickering - Oshawa - Southern Durham Region. Today..Sunny. High 13. UV index 4 or moderate. Tonight..Clear. Low plus 2 with patchy frost. Friday..Sunny. Becoming a mix of sun and cloud in the morning. High 17. UV index 4 or moderate. Uxbridge - Beaverton - Northern Durham Region. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low zero with frost. Friday..Sunny. Becoming a mix of sun and cloud in the morning. Wind becoming south 20 km/h near noon. High 17. UV index 4 or moderate. Goderich - Bluewater - Southern Huron County. Today..Clearing. High 13. UV index 4 or moderate. Tonight..Clear. Low zero with patchy frost. Friday..Mainly sunny. Wind becoming southwest 20 km/h near noon. High 16. UV index 4 or moderate. Wingham - Blyth - Northern Huron County. Today..Clearing. High 13. UV index 4 or moderate. Tonight..Clear. Low zero with patchy frost. Friday..A mix of sun and cloud. Wind becoming southwest 20 km/h near noon. High 16. UV index 4 or moderate. Stratford - Mitchell - Southern Perth County. Today..Mainly sunny. High 13. UV index 4 or moderate. Tonight..Clear. Low zero with frost. Friday..A mix of sun and cloud. Wind becoming southwest 20 km/h near noon. High 16. UV index 3 or moderate. Listowel - Milverton - Northern Perth County. Today..Sunny. High 13. UV index 4 or moderate. Tonight..Clear. Low zero with frost. Friday..A mix of sun and cloud. Wind becoming southwest 20 km/h near noon. High 16. UV index 4 or moderate. Kitchener - Cambridge - Region of Waterloo. Today..Sunny. High 13. UV index 4 or moderate. Tonight..Clear. Low zero with frost. Friday..Mainly sunny. Wind becoming southwest 20 km/h near noon. High 16. UV index 4 or moderate. Guelph - Erin - Southern Wellington County. Today..Sunny. High 13. UV index 4 or moderate. Tonight..Clear. Low zero with frost. Friday..Mainly sunny. Wind becoming southwest 20 km/h near noon. High 16. UV index 4 or moderate. Mount Forest - Arthur - Northern Wellington County. Today..Sunny. High 13. UV index 4 or moderate. Tonight..Clear. Low zero with frost. Friday..Mainly sunny. Increasing cloudiness late in the morning. Wind becoming southwest 20 km/h near noon. High 16. UV index 4 or moderate. Orangeville - Grand Valley - Southern Dufferin County. Today..Sunny. High 13. UV index 4 or moderate. Tonight..Clear. Low zero with frost. Friday..Sunny. Becoming a mix of sun and cloud late in the morning. Wind becoming southwest 20 km/h near noon. High 16. UV index 4 or moderate. Shelburne - Mansfield - Northern Dufferin County. Today..Sunny. High 13. UV index 4 or moderate. Tonight..Clear. Low zero with frost. Friday..Sunny. Becoming a mix of sun and cloud in the morning. Wind becoming southwest 20 km/h near noon. High 16. UV index 4 or moderate. Innisfil - New Tecumseth - Angus. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low zero. Friday..Sunny. Becoming a mix of sun and cloud near noon. Wind becoming south 20 km/h near noon. High 17. UV index 4 or moderate. Saugeen Shores - Kincardine - Southern Bruce County. Today..Clearing. High 13. UV index 4 or moderate. Tonight..Clear. Becoming partly cloudy near midnight. Low zero with patchy frost. Friday..A mix of sun and cloud. Wind becoming southwest 20 km/h near noon. High 16. UV index 4 or moderate. Bruce Peninsula - Sauble Beach - Tobermory. Today..A mix of sun and cloud. High 13. UV index 4 or moderate. Tonight..Clear. Becoming partly cloudy after midnight. Low plus 4. Friday..Mainly cloudy. Wind becoming southwest 20 km/h gusting to 40 near noon. High 15. UV index 3 or moderate. Hanover - Dundalk - Southern Grey County. Today..Clearing. High 13. UV index 4 or moderate. Tonight..Clear. Low zero with patchy frost. Friday..Mainly sunny. Increasing cloudiness near noon. Wind becoming southwest 20 km/h near noon. High 16. UV index 4 or moderate. Owen Sound - Blue Mountains - Northern Grey County. Today..Clearing. High 13. UV index 4 or moderate. Tonight..Clear. Increasing cloudiness after midnight. Low zero with patchy frost. Friday..A mix of sun and cloud. Wind becoming southwest 20 km/h near noon. High 16. UV index 4 or moderate. Barrie - Collingwood - Hillsdale. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low zero. Friday..Sunny. Becoming a mix of sun and cloud near noon. Wind becoming south 20 km/h near noon. High 17. UV index 4 or moderate. Midland - Coldwater - Orr Lake. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low zero. Friday..Sunny. Increasing cloudiness early in the afternoon. Wind becoming south 20 km/h near noon. High 17. UV index 4 or moderate. Orillia - Lagoon City - Washago. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low zero. Friday..Sunny. Becoming a mix of sun and cloud late in the morning. Wind becoming south 20 km/h near noon. High 17. UV index 4 or moderate. Cobourg - Colborne - Western Northumberland County. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low plus 2 with patchy frost. Friday..Sunny. High 15. UV index 4 or moderate. Belleville - Quinte West - Eastern Northumberland County. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low plus 2 with patchy frost. Friday..Sunny. High 15. UV index 4 or moderate. Picton - Sandbanks Park. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low plus 2 with patchy frost. Friday..Sunny. High 15. UV index 4 or moderate. Napanee - Consecon. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low plus 2 with patchy frost. Friday..Sunny. High 15. UV index 4 or moderate. Kingston - Odessa - Frontenac Islands. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low plus 2 with patchy frost. Friday..Sunny. High 15. UV index 4 or moderate. Lindsay - Southern Kawartha Lakes. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low minus 1. Friday..Sunny. Becoming a mix of sun and cloud late in the morning. High 15. UV index 4 or moderate. Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes. Today..Sunny. Wind up to 15 km/h. High 11. Wind chill minus 5 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..Sunny. Becoming a mix of sun and cloud late in the morning. Wind up to 15 km/h. High 15. Wind chill minus 3 in the morning. UV index 4 or moderate. Peterborough City - Lakefield - Southern Peterborough County. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low minus 1. Friday..Sunny. Becoming a mix of sun and cloud late in the morning. High 15. UV index 4 or moderate. Apsley - Woodview - Northern Peterborough County. Today..Sunny. Wind up to 15 km/h. High 11. Wind chill minus 5 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..Sunny. Becoming a mix of sun and cloud near noon. Wind up to 15 km/h. High 15. Wind chill minus 3 in the morning. UV index 4 or moderate. Stirling - Tweed - Madoc. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Becoming partly cloudy before morning. Low minus 1. Friday..Sunny. High 15. UV index 4 or moderate. Tamworth - Sydenham - South Frontenac. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low minus 1. Friday..Sunny. High 15. UV index 4 or moderate. Kaladar - Bannockburn - Bon Echo Park. Today..Sunny. Wind up to 15 km/h. High 11. Wind chill minus 5 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..Sunny. Wind up to 15 km/h. High 15. Wind chill minus 3 in the morning. UV index 4 or moderate. Bancroft - Hastings Highlands - Denbigh. Today..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..Sunny. Becoming a mix of sun and cloud in the afternoon. High 13. UV index 4 or moderate. Gananoque - Mallorytown. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low plus 2 with patchy frost. Friday..Sunny. High 15. UV index 4 or moderate. Brockville - Prescott. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low plus 2 with patchy frost. Friday..Sunny. High 15. UV index 4 or moderate. Westport - Charleston Lake. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low minus 1. Friday..Mainly sunny. High 15. UV index 4 or moderate. Merrickville-Wolford - Kemptville. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low minus 1. Friday..Mainly sunny. High 15. UV index 4 or moderate. Ottawa North - Kanata - Orl‚ans. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low minus 1. Friday..Mainly sunny. High 15. UV index 4 or moderate. Ottawa South - Richmond - Metcalfe. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low minus 1. Friday..Mainly sunny. High 15. UV index 4 or moderate. Gatineau. Today..Sunny. High 12. UV index 3 or moderate. Tonight..Clear. Low minus 1. Friday..Sunny. High 15. UV index 4 or moderate. Prescott and Russell. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low minus 1. Friday..Mainly sunny. High 15. UV index 4 or moderate. Morrisburg - Long Sault. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low minus 1. Friday..Sunny. High 15. UV index 4 or moderate. Cornwall - Lancaster. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low minus 1. Friday..Sunny. High 15. UV index 4 or moderate. Winchester - Newington. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low minus 1. Friday..Sunny. High 15. UV index 4 or moderate. Maxville - Alexandria. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low minus 1. Friday..Sunny. High 15. UV index 4 or moderate. Plevna - Sharbot Lake - Western Lanark County. Today..Sunny. Wind up to 15 km/h. High 11. Wind chill minus 5 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..Sunny. Wind up to 15 km/h. High 15. Wind chill minus 3 in the morning. UV index 4 or moderate. Smiths Falls - Perth - Eastern Lanark County. Today..Sunny. High 12. UV index 4 or moderate. Tonight..Clear. Low minus 1. Friday..Mainly sunny. High 15. UV index 4 or moderate. Port Carling - Port Severn. Today..Sunny. High 11. UV index 4 or moderate. Tonight..Clear. Low plus 3. Friday..Sunny. Becoming a mix of sun and cloud near noon. High 15. UV index 4 or moderate. Bracebridge - Gravenhurst. Today..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..Sunny. Becoming a mix of sun and cloud near noon. High 13. UV index 4 or moderate. Town of Parry Sound - Rosseau - Killbear Park. Today..Sunny. High 11. UV index 4 or moderate. Tonight..Clear. Low plus 3. Friday..A mix of sun and cloud. High 15. UV index 4 or moderate. Huntsville - Baysville. Today..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..A mix of sun and cloud. High 13. UV index 4 or moderate. Haliburton - Minden - Southern Haliburton County. Today..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..Sunny. Increasing cloudiness near noon. High 13. UV index 4 or moderate. Oxtongue Lake - Fort Irwin - Northern Haliburton County. Today..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..Sunny. Becoming a mix of sun and cloud near noon. High 13. UV index 4 or moderate. Barry's Bay - Killaloe. Today..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..Sunny. Becoming a mix of sun and cloud in the afternoon. High 13. UV index 4 or moderate. Renfrew - Arnprior - Calabogie. Today..Sunny. Wind up to 15 km/h. High 11. Wind chill minus 4 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..Sunny. Wind up to 15 km/h. High 15. Wind chill minus 4 in the morning. UV index 4 or moderate. Petawawa - Pembroke - Cobden. Today..Sunny. Wind up to 15 km/h. High 11. Wind chill minus 4 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..Sunny. Wind up to 15 km/h. High 15. Wind chill minus 4 in the morning. UV index 4 or moderate. Western Algonquin Park - Lake of Two Rivers. Today..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..Sunny. Increasing cloudiness early in the afternoon. High 13. UV index 4 or moderate. Deep River - Whitney - Eastern Algonquin Park. Today..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..Sunny. Becoming a mix of sun and cloud in the afternoon. High 13. UV index 4 or moderate. Bayfield Inlet - Dunchurch. Today..Sunny. High 11. UV index 4 or moderate. Tonight..Clear. Low plus 3. Friday..A mix of sun and cloud. High 15. UV index 4 or moderate. South River - Burk's Falls. Today..Sunny. Wind up to 15 km/h. High 10. Wind chill minus 6 this morning. UV index 4 or moderate. Tonight..Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 4 overnight. Friday..Increasing cloudiness in the morning. High 13. UV index 4 or moderate. End $$$$^^ --- up 8 hours, 11 minutes * Origin: Northern Realms (618:400/23) .