Subj : Southern Ontario Weather To : All From : Northern Realms Date : Tue Oct 07 2025 15:35:02 FPCN11 CWTO 071930 Forecasts for Southern Ontario and the National Capital Region issued by Environment Canada at 3:30 p.m. EDT Tuesday 7 October 2025 for tonight Wednesday and Wednesday night. The next scheduled forecast will be issued at 5:00 a.m. EDT Wednesday. City of Toronto. Tonight..Showers ending early this evening then clearing. Wind northwest 20 km/h. Low 10. Wednesday..Sunny. Wind northwest 20 km/h gusting to 40. High 17. UV index 4 or moderate. Wednesday night..Clear. Low plus 5. Windsor - Essex - Chatham-Kent. Tonight..A few showers ending this evening then clearing. Wind north 20 km/h gusting to 40 becoming light this evening. Low 8. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 in the morning. High 17. UV index 5 or moderate. Wednesday night..Clear. Low plus 3 with risk of frost. Sarnia - Lambton. Tonight..A few showers ending this evening then clearing. Wind north 20 km/h gusting to 40 becoming light this evening. Low 10. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 in the morning. High 16. UV index 5 or moderate. Wednesday night..Clear. Low plus 2 with risk of frost. Elgin. Tonight..A few showers ending this evening then clearing. Wind north 20 km/h gusting to 40 becoming light late this evening. Low 8. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 in the morning. High 17. UV index 5 or moderate. Wednesday night..Clear. Low plus 3 with risk of frost. London - Middlesex. Tonight..A few showers ending this evening then clearing. Wind north 20 km/h gusting to 40 becoming light this evening. Low 8. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 in the morning. High 16. UV index 4 or moderate. Wednesday night..Clear. Low plus 2 with risk of frost. Simcoe - Delhi - Norfolk. Tonight..A few showers ending late this evening then clearing. Wind west 20 km/h becoming north 20 gusting to 40 early this evening. Low 7. Wednesday..Sunny. Wind north 20 km/h gusting to 40. High 17. UV index 4 or moderate. Wednesday night..Clear. Low plus 2 with risk of frost. Dunnville - Caledonia - Haldimand. Tonight..Showers ending late this evening then clearing. Risk of a thunderstorm early this evening. Wind west 30 km/h becoming light after midnight. Low 6. Wednesday..Sunny. Wind northwest 20 km/h gusting to 40. High 17. UV index 4 or moderate. Wednesday night..Clear. Low plus 3 with risk of frost. Oxford - Brant. Tonight..A few showers ending late this evening then clearing. Wind west 20 km/h becoming light early this evening. Low 6. Wednesday..Sunny. Wind northwest 20 km/h gusting to 40. High 17. UV index 4 or moderate. Wednesday night..Clear. Low plus 2 with risk of frost. Niagara Falls - Welland - Southern Niagara Region. Tonight..Showers ending near midnight then partly cloudy. Wind west 20 km/h becoming light this evening. Low 11. Wednesday..Sunny. Wind northwest 20 km/h. High 16. UV index 4 or moderate. Wednesday night..Clear. Low 7. St. Catharines - Grimsby - Northern Niagara Region. Tonight..Showers ending late this evening then clearing. Wind northwest 20 km/h. Low 11. Wednesday..Sunny. Wind northwest 20 km/h. High 16. UV index 4 or moderate. Wednesday night..Clear. Low plus 5. City of Hamilton. Tonight..A few showers ending late this evening then partly cloudy. Wind southwest 20 km/h becoming light early this evening. Low 7. Wednesday..Sunny. Wind becoming north 20 km/h in the morning. High 17. UV index 4 or moderate. Wednesday night..Clear. Low plus 3 with risk of frost. Halton - Peel. Tonight..Showers ending this evening then clearing. Low 7. Wednesday..Sunny. Wind becoming north 20 km/h in the morning. High 17. UV index 4 or moderate. Wednesday night..Clear. Low plus 2 with risk of frost. York - Durham. Tonight..A few showers ending this evening then clearing. Wind west 20 km/h becoming light early this evening. Low 7. Wednesday..Sunny. High 17. UV index 4 or moderate. Wednesday night..Clear. Low plus 1 with risk of frost. Goderich - Bluewater - Southern Huron County Stratford - Mitchell - Southern Perth County. Tonight..A few showers ending early this evening then clearing. Wind north 20 km/h. Low plus 5. Wednesday..Sunny. Wind north 20 km/h gusting to 40. High 16. UV index 4 or moderate. Wednesday night..Clear. Wind north 20 km/h becoming light in the evening. Low zero. Wingham - Blyth - Northern Huron County Listowel - Milverton - Northern Perth County. Tonight..A few showers ending early this evening then clearing. Wind north 20 km/h. Low plus 5. Wednesday..Sunny. Wind north 20 km/h gusting to 40. High 16. UV index 4 or moderate. Wednesday night..Clear. Wind north 20 km/h becoming light in the evening. Low zero. Kitchener - Cambridge - Region of Waterloo Guelph - Erin - Southern Wellington County. Tonight..A few showers ending early this evening then clearing. Low 6. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 in the morning. High 16. UV index 4 or moderate. Wednesday night..Clear. Wind north 20 km/h becoming light in the evening. Low plus 1. Mount Forest - Arthur - Northern Wellington County. Tonight..A few showers ending early this evening then clearing. Low plus 5. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 in the morning. High 13. UV index 4 or moderate. Wednesday night..Clear. Low plus 1. Dufferin - Innisfil. Tonight..A few showers ending early this evening then clearing. Low plus 5. Wednesday..Sunny. Wind becoming northwest 20 km/h gusting to 40 in the morning. High 15. UV index 4 or moderate. Wednesday night..Clear. Low minus 1. Saugeen Shores - Kincardine - Southern Bruce County. Tonight..Showers ending early this evening then clearing. Wind northwest 30 km/h. Low 6. Wednesday..Sunny. Wind north 20 km/h. High 14. UV index 4 or moderate. Wednesday night..Clear. Becoming partly cloudy in the evening. Wind north 20 km/h becoming light in the evening. Low plus 2. Bruce Peninsula - Sauble Beach - Tobermory. Tonight..Clearing early this evening. Wind northwest 30 km/h. Low 6. Wednesday..Sunny. Wind north 20 km/h. High 14. UV index 4 or moderate. Wednesday night..Clear. Becoming partly cloudy in the evening. Wind becoming east 20 km/h overnight. Low plus 2. Hanover - Dundalk - Southern Grey County Owen Sound - Blue Mountains - Northern Grey County. Tonight..Showers ending early this evening then clearing. Wind northwest 20 km/h becoming light overnight. Low plus 4. Wednesday..Sunny. Wind becoming north 30 km/h in the morning. High 13. UV index 4 or moderate. Wednesday night..Clear. Low zero. Barrie - Collingwood - Hillsdale. Tonight..Showers ending early this evening then clearing. Wind northwest 20 km/h gusting to 40. Low 6. Wednesday..Sunny. Wind north 20 km/h. High 15. UV index 4 or moderate. Wednesday night..Clear. Low plus 1. Midland - Coldwater - Orr Lake Orillia - Lagoon City - Washago. Tonight..Showers ending early this evening then clearing. Wind northwest 20 km/h gusting to 40. Low 6. Wednesday..Sunny. Wind north 30 km/h. High 15. UV index 4 or moderate. Wednesday night..Clear. Low plus 1. Belleville - Quinte - Northumberland. Tonight..Showers ending this evening then clearing. Risk of a thunderstorm early this evening. Wind southwest 30 km/h becoming light early this evening. Low 10. Wednesday..Sunny. Wind becoming north 20 km/h near noon. High 17. UV index 4 or moderate. Wednesday night..Clear. Low plus 2 with risk of frost. Picton - Sandbanks Park Napanee - Consecon. Tonight..Showers ending late this evening then partly cloudy. Risk of a thunderstorm early this evening. Wind southwest 30 km/h becoming light this evening. Low 10. Wednesday..Sunny. Wind becoming north 20 km/h in the afternoon. High 17. UV index 4 or moderate. Wednesday night..Clear. Wind north 20 km/h becoming light in the evening. Low plus 2 with risk of frost. Kingston - Odessa - Frontenac Islands. Tonight..Showers ending late this evening then partly cloudy. Risk of a thunderstorm early this evening. Amount 15 to 25 mm. Wind southwest 20 km/h gusting to 40 becoming light this evening. Low 10. Wednesday..Sunny. Wind becoming north 20 km/h in the afternoon. High 17. UV index 4 or moderate. Wednesday night..Clear. Wind north 20 km/h becoming light in the evening. Low plus 3 with risk of frost. Lindsay - Southern Kawartha Lakes Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes. Tonight..Showers ending this evening then clearing. Wind northwest 20 km/h becoming light early this evening. Low 6. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 near noon. High 16. UV index 4 or moderate. Wednesday night..Clear. Low minus 1. Peterborough City - Lakefield - Southern Peterborough County Apsley - Woodview - Northern Peterborough County. Tonight..Showers ending this evening then clearing. Wind west 20 km/h becoming light this evening. Low 6. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 near noon. High 16. UV index 4 or moderate. Wednesday night..Clear. Wind north 20 km/h becoming light in the evening. Low minus 1. Stirling - Tweed - South Frontenac. Tonight..A few showers ending late this evening then clearing. Risk of a thunderstorm early this evening. Amount 10 to 15 mm. Wind southwest 20 km/h becoming light early this evening. Low 8. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 in the afternoon. High 16. UV index 4 or moderate. Wednesday night..Clear. Wind north 20 km/h becoming light in the evening. Low zero. Bancroft - Bon Echo Park. Tonight..A few showers ending this evening then clearing. Risk of a thunderstorm early this evening. Wind southwest 20 km/h becoming light early this evening. Low plus 5. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 in the afternoon. High 12. UV index 4 or moderate. Wednesday night..Clear. Wind north 20 km/h becoming light in the evening. Low minus 4. Wind chill minus 6 overnight. Gananoque - Mallorytown. Tonight..A few showers ending near midnight then partly cloudy. Risk of a thunderstorm early this evening. Amount 15 to 25 mm. Wind southwest 20 km/h becoming light this evening. Low 9. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 near noon. High 16. UV index 4 or moderate. Wednesday night..Clear. Wind north 20 km/h becoming light near midnight. Low plus 1 with risk of frost. Brockville - Prescott. Tonight..A few showers ending near midnight then partly cloudy. Risk of a thunderstorm early this evening. Amount 15 to 25 mm. Wind southwest 20 km/h becoming light this evening. Low 9. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 near noon. High 16. UV index 4 or moderate. Wednesday night..Clear. Low plus 1 with risk of frost. Westport - Charleston Lake Merrickville-Wolford - Kemptville. Tonight..A few showers ending near midnight then partly cloudy. Risk of a thunderstorm early this evening. Amount 10 to 20 mm. Wind southwest 20 km/h becoming light this evening. Low 9. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 near noon. High 16. UV index 4 or moderate. Wednesday night..Clear. Low plus 1. City of Ottawa. Tonight..A few showers ending this evening then clearing. Risk of a thunderstorm early this evening. Wind southwest 20 km/h becoming light early this evening. Low 8. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 near noon. High 15. UV index 4 or moderate. Wednesday night..Clear. Wind northwest 20 km/h becoming light in the evening. Low zero. Gatineau. Tonight..A few showers ending this evening then clearing. Risk of a thunderstorm early this evening. Wind southwest 20 km/h becoming light early this evening. Low 8. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 near noon. High 16. UV index 4 or moderate. Wednesday night..Clear. Low plus 1. Prescott and Russell. Tonight..A few showers ending near midnight then clearing. Risk of a thunderstorm early this evening. Wind southwest 20 km/h becoming light this evening. Low 8. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 near noon. High 15. UV index 4 or moderate. Wednesday night..Clear. Low zero. Cornwall - Morrisburg. Tonight..A few showers ending after midnight then partly cloudy. Risk of a thunderstorm early this evening. Amount 10 to 20 mm. Low 9. Wednesday..Clearing in the morning. Wind becoming north 20 km/h gusting to 40 near noon. High 16. UV index 4 or moderate. Wednesday night..Clear. Low zero. Smiths Falls - Lanark - Sharbot Lake. Tonight..A few showers ending late this evening then clearing. Risk of a thunderstorm early this evening. Wind southwest 20 km/h becoming light early this evening. Low 8. Wednesday..Sunny. High 16. UV index 4 or moderate. Wednesday night..Clear. Low plus 1. Port Carling - Port Severn Bracebridge - Gravenhurst. Tonight..A few showers ending early this evening then clearing. Wind northwest 20 km/h becoming light after midnight. Low plus 5. Wednesday..Sunny. Wind north 20 km/h. High 15. UV index 4 or moderate. Wednesday night..Clear. Wind up to 15 km/h. Low minus 3. Wind chill minus 5 overnight. Town of Parry Sound - Rosseau - Killbear Park Huntsville - Baysville. Tonight..Cloudy with 30 percent chance of showers early this evening. Clearing this evening. Wind northwest 20 km/h becoming light after midnight. Low plus 5. Wednesday..Sunny. Wind north 20 km/h. High 14. UV index 4 or moderate. Wednesday night..Clear. Low minus 2. Haliburton. Tonight..A few showers ending early this evening then clearing. Low plus 5. Wednesday..Sunny. Wind north 20 km/h becoming light in the afternoon. High 13. UV index 4 or moderate. Wednesday night..Clear. Low minus 2. Renfrew - Pembroke - Barry's Bay. Tonight..A few showers ending this evening then clearing. Low 8. Wednesday..Sunny. Wind becoming north 20 km/h gusting to 40 near noon. High 13. UV index 4 or moderate. Wednesday night..Clear. Low minus 2. Algonquin. Tonight..Cloudy with 30 percent chance of showers early this evening. Clearing this evening. Low plus 4. Wednesday..Sunny. High 11. UV index 4 or moderate. Wednesday night..Clear. Low minus 6. Burk's Falls - Bayfield Inlet. Tonight..Clearing early this evening. Low plus 5. Wednesday..Sunny. High 14. UV index 4 or moderate. Wednesday night..Clear. Low minus 3. End $$$$^^ --- up 1 day, 23 hours, 16 minutes * Origin: Northern Realms (1:229/664) .