Subj : Southern Ontario Weather To : All From : Northern Realms Date : Tue Oct 07 2025 05:05:02 FPCN11 CWTO 070900 Forecasts for Southern Ontario and the National Capital Region issued by Environment Canada at 5:00 a.m. EDT Tuesday 7 October 2025 for today and Wednesday. The next scheduled forecast will be issued at 11:00 a.m. EDT. City of Toronto. Today..Cloudy. 30 percent chance of showers early this morning. Showers beginning this morning. Risk of a thunderstorm. Local amount 10 to 20 mm. Wind becoming southwest 20 km/h this morning. High 21. Humidex 27. UV index 2 or low. Tonight..Clearing late this evening. Low 8. Wednesday..Sunny. Wind north 20 km/h. High 15. UV index 4 or moderate. Windsor - Essex - Chatham-Kent. Today..Cloudy. 40 percent chance of showers this morning. A few showers beginning this morning and ending this afternoon. Risk of a thunderstorm this morning and early this afternoon. Local amount 10 to 20 mm. Wind becoming north 20 km/h this afternoon. High 20. Humidex 26. UV index 2 or low. Tonight..Cloudy. Clearing before morning. Wind north 20 km/h becoming light this evening. Low 6. Wednesday..Sunny. High 16. UV index 5 or moderate. Sarnia - Lambton. Today..Cloudy. 40 percent chance of showers this morning. A few showers beginning this morning and ending this afternoon. Risk of a thunderstorm this morning and early this afternoon. Wind becoming north 20 km/h this afternoon. High 19 with temperature falling to 15 this afternoon. UV index 2 or low. Tonight..Partly cloudy. Clearing after midnight. Wind north 20 km/h. Low 7. Wednesday..Sunny. Wind north 20 km/h. High 15. UV index 4 or moderate. Elgin. Today..Cloudy. 40 percent chance of showers early this morning. A few showers beginning this morning and ending this afternoon. Risk of a thunderstorm this morning and early this afternoon. Local amount 10 to 20 mm. Wind southwest 20 km/h becoming northwest 20 late this morning. High 20 with temperature falling to 14 this afternoon. Humidex 27. UV index 2 or low. Tonight..Cloudy. Clearing after midnight. Wind northwest 20 km/h becoming light this evening. Low 6. Wednesday..Sunny. Wind becoming north 20 km/h late in the morning. High 15. UV index 4 or moderate. London - Middlesex. Today..Cloudy. 40 percent chance of showers this morning. A few showers beginning this morning and ending this afternoon. Risk of a thunderstorm this morning and early this afternoon. Wind becoming northwest 20 km/h this afternoon. High 19 with temperature falling to 14 this afternoon. UV index 2 or low. Tonight..Clearing late this evening. Wind north 20 km/h. Low 6. Wednesday..Sunny. Wind north 20 km/h. High 16. UV index 4 or moderate. Simcoe - Delhi - Norfolk. Today..Cloudy. 40 percent chance of showers early this morning. A few showers beginning this morning and ending this afternoon. Risk of a thunderstorm this morning and early this afternoon. Local amount 10 to 20 mm. Wind west 30 km/h. High 19. UV index 2 or low. Tonight..Cloudy. Clearing overnight. Wind west 30 km/h becoming light this evening. Low plus 5. Wednesday..Sunny. Wind north 20 km/h. High 16. UV index 4 or moderate. Dunnville - Caledonia - Haldimand. Today..Cloudy. 40 percent chance of showers this morning. Showers beginning this morning. Risk of a thunderstorm. Amount 15 to 25 mm. Wind west 30 km/h. High 20. Humidex 27. UV index 2 or low. Tonight..Cloudy. 40 percent chance of showers early this evening. Clearing before morning. Wind becoming northwest 20 km/h before morning. Low 6. Wednesday..Sunny. Wind north 20 km/h. High 15. UV index 4 or moderate. Oxford - Brant. Today..Cloudy. 40 percent chance of showers early this morning. A few showers beginning this morning and ending this afternoon. Risk of a thunderstorm this morning and early this afternoon. Wind southwest 30 km/h. High 22. Humidex 27. UV index 2 or low. Tonight..Mainly cloudy. Clearing before morning. Low plus 5. Wednesday..Sunny. Wind north 20 km/h. High 16. UV index 4 or moderate. Niagara Falls - Welland - Southern Niagara Region. Today..Cloudy. 40 percent chance of showers this morning. Showers beginning this morning. Risk of a thunderstorm. Amount 15 to 25 mm. Wind southwest 30 km/h. High 23. Humidex 30. UV index 2 or low. Tonight..Cloudy. 40 percent chance of showers early this evening. Clearing after midnight. Wind west 20 km/h becoming light this evening. Low 10. Wednesday..Sunny. Wind north 20 km/h. High 14. UV index 4 or moderate. St. Catharines - Grimsby - Northern Niagara Region. Today..Cloudy. 40 percent chance of showers this morning. Showers beginning this morning. Risk of a thunderstorm. Amount 15 to 25 mm. Wind southwest 20 km/h. High 23 with temperature falling to 15 this afternoon. Humidex 29. UV index 2 or low. Tonight..Cloudy. 40 percent chance of showers early this evening. Clearing after midnight. Wind northwest 20 km/h. Low 9. Wednesday..Sunny. Wind north 20 km/h. High 14. UV index 4 or moderate. City of Hamilton. Today..Cloudy. 40 percent chance of showers early this morning. A few showers beginning this morning and ending this afternoon. Risk of a thunderstorm this morning and early this afternoon. Local amount 10 to 20 mm. Wind southwest 20 km/h. High 21. Humidex 27. UV index 2 or low. Tonight..Cloudy. Becoming partly cloudy this evening. Wind southwest 20 km/h becoming light this evening. Low 6. Wednesday..Sunny. Wind becoming north 20 km/h in the morning. High 15. UV index 4 or moderate. Halton - Peel. Today..Cloudy. 30 percent chance of showers early this morning. Showers beginning this morning. Risk of a thunderstorm. Local amount 10 to 20 mm. Wind west 20 km/h. High 21. Humidex 26. UV index 2 or low. Tonight..Clearing after midnight. Wind west 20 km/h becoming light this evening. Low 7. Wednesday..Sunny. Wind becoming north 20 km/h in the morning. High 15. UV index 4 or moderate. York - Durham. Today..Cloudy. 30 percent chance of showers early this morning. Showers beginning this morning. Risk of a thunderstorm. Local amount 10 to 20 mm. Wind becoming west 20 km/h this morning. High 20 with temperature falling to 15 this afternoon. Humidex 25. UV index 2 or low. Tonight..Clearing late this evening. Low 6. Wednesday..Sunny. Wind becoming northwest 20 km/h late in the afternoon. High 15. UV index 4 or moderate. Goderich - Bluewater - Southern Huron County Stratford - Mitchell - Southern Perth County. Today..A few showers ending this afternoon then cloudy. Risk of a thunderstorm this morning and early this afternoon. Local amount 10 to 15 mm. Wind becoming northwest 20 km/h this afternoon. Temperature steady near 16. UV index 2 or low. Tonight..Clearing late this evening. Wind becoming north 20 km/h late this evening. Low plus 4. Wednesday..Sunny. Wind north 20 km/h. High 14. UV index 4 or moderate. Wingham - Blyth - Northern Huron County Listowel - Milverton - Northern Perth County. Today..A few showers ending this afternoon then cloudy. Risk of a thunderstorm this morning and early this afternoon. Local amount 10 to 15 mm. Wind becoming northwest 20 km/h this afternoon. Temperature steady near 16. UV index 2 or low. Tonight..Clearing late this evening. Wind becoming north 20 km/h late this evening. Low plus 4. Wednesday..Sunny. Wind north 20 km/h. High 14. UV index 4 or moderate. Kitchener - Cambridge - Region of Waterloo Guelph - Erin - Southern Wellington County. Today..Cloudy. 40 percent chance of showers early this morning. A few showers beginning this morning and ending this afternoon. Risk of a thunderstorm this morning and early this afternoon. High 20 with temperature falling to 13 this afternoon. Humidex 25. UV index 2 or low. Tonight..Clearing late this evening. Low plus 5. Wednesday..Sunny. Wind becoming north 20 km/h late in the morning. High 15. UV index 4 or moderate. Mount Forest - Arthur - Northern Wellington County. Today..A few showers ending this afternoon then cloudy. Risk of a thunderstorm this morning and early this afternoon. Local amount 10 to 15 mm. Temperature falling to 12 this afternoon. UV index 2 or low. Tonight..Clearing this evening. Low plus 4. Wednesday..Sunny. Wind becoming north 20 km/h late in the morning. High 13. UV index 4 or moderate. Dufferin - Innisfil. Today..A few showers ending this afternoon then cloudy. Risk of a thunderstorm this morning and early this afternoon. Local amount 10 to 15 mm. High 18. UV index 2 or low. Tonight..Clearing late this evening. Low plus 5. Wednesday..Sunny. Wind becoming northwest 20 km/h in the morning. High 13. UV index 4 or moderate. Saugeen Shores - Kincardine - Southern Bruce County. Today..Showers ending near noon then a mix of sun and cloud. Risk of a thunderstorm this morning. Local amount 10 to 20 mm. Wind north 20 km/h becoming light this afternoon. High 17. UV index 3 or moderate. Tonight..Clearing this evening. Wind becoming northwest 30 km/h this evening. Low 7. Wednesday..Sunny. Wind north 20 km/h. High 13. UV index 4 or moderate. Bruce Peninsula - Sauble Beach - Tobermory. Today..A few showers ending this morning then clearing. Risk of thunderstorms early this morning. Local amount 10 to 15 mm. Wind becoming northwest 30 km/h late this morning. High 16. UV index 3 or moderate. Tonight..Clear. Wind northwest 30 km/h. Low plus 4. Wednesday..Sunny. Wind becoming north 20 km/h late in the morning. High 11. UV index 4 or moderate. Hanover - Dundalk - Southern Grey County Owen Sound - Blue Mountains - Northern Grey County. Today..Showers ending near noon then a mix of sun and cloud. Risk of a thunderstorm this morning. Local amount 10 to 20 mm. Wind becoming northwest 20 km/h late this afternoon. High 16. UV index 3 or moderate. Tonight..Clearing this evening. Wind northwest 20 km/h. Low plus 5. Wednesday..Sunny. Wind north 20 km/h. High 12. UV index 4 or moderate. Barrie - Collingwood - Hillsdale. Today..Showers ending near noon then cloudy. Risk of a thunderstorm this morning. Local amount 10 to 20 mm. Wind becoming northwest 20 km/h late this morning. High 17. UV index 2 or low. Tonight..Clearing this evening. Wind northwest 20 km/h. Low plus 3. Wednesday..Sunny. Wind northwest 20 km/h. High 13. UV index 4 or moderate. Midland - Coldwater - Orr Lake Orillia - Lagoon City - Washago. Today..Showers ending near noon then cloudy. Risk of a thunderstorm this morning. Local amount 10 to 20 mm. Wind becoming northwest 20 km/h late this morning. Temperature steady near 16. UV index 2 or low. Tonight..Clearing late this evening. Wind northwest 20 km/h. Low plus 5. Wednesday..Sunny. Wind northwest 20 km/h. High 14. UV index 4 or moderate. Belleville - Quinte - Northumberland. Today..Increasing cloudiness. 40 percent chance of showers late this morning. Showers beginning near noon. Risk of a thunderstorm late this morning and this afternoon. Amount 10 to 15 mm. Wind becoming southwest 30 km/h late this morning. High 22 with temperature falling to 17 this afternoon. Humidex 27. UV index 3 or moderate. Tonight..Showers ending this evening then clearing. Risk of a thunderstorm early this evening. Low 7. Wednesday..Sunny. High 16. UV index 4 or moderate. Picton - Sandbanks Park Napanee - Consecon. Today..Increasing cloudiness. 40 percent chance of showers late this morning. Showers beginning near noon. Risk of a thunderstorm late this morning and this afternoon. Amount 10 to 15 mm. Wind becoming southwest 30 km/h late this morning. High 22 with temperature falling to 17 this afternoon. Humidex 27. UV index 3 or moderate. Tonight..Showers ending this evening then clearing. Risk of a thunderstorm early this evening. Low 7. Wednesday..Sunny. High 16. UV index 4 or moderate. Kingston - Odessa - Frontenac Islands. Today..Becoming cloudy this morning with 40 percent chance of showers late this morning. Showers beginning near noon. Risk of a thunderstorm late this morning and this afternoon. Amount 10 to 15 mm. Wind becoming southwest 20 km/h this morning. High 22 with temperature falling to 17 this afternoon. Humidex 27. UV index 2 or low. Tonight..Showers ending this evening then partly cloudy. Risk of a thunderstorm early this evening. Low 9. Wednesday..Sunny. High 15. UV index 4 or moderate. Lindsay - Southern Kawartha Lakes Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes. Today..Cloudy. 30 percent chance of showers this morning. Showers beginning this morning and ending this afternoon. Risk of a thunderstorm. Wind becoming west 20 km/h this morning. Temperature falling to 14 this afternoon. UV index 2 or low. Tonight..Clearing late this evening. Low plus 5. Wednesday..Sunny. High 13. UV index 4 or moderate. Peterborough City - Lakefield - Southern Peterborough County Apsley - Woodview - Northern Peterborough County. Today..Increasing cloudiness. 30 percent chance of showers this morning. Showers beginning this morning and ending this afternoon. Risk of a thunderstorm. Wind becoming west 20 km/h late this morning. High 20. Humidex 25. UV index 2 or low. Tonight..Clearing late this evening. Wind west 20 km/h becoming light this evening. Low plus 4. Wednesday..Sunny. High 15. UV index 4 or moderate. Stirling - Tweed - South Frontenac. Today..Increasing cloudiness. 40 percent chance of showers late this morning. A few showers beginning near noon. Risk of a thunderstorm late this morning and this afternoon. Amount 10 to 15 mm. Wind becoming southwest 20 km/h this morning. High 23 with temperature falling to 17 this afternoon. Humidex 28. UV index 3 or moderate. Tonight..A few showers ending this evening then clearing. Low 6. Wednesday..Sunny. High 14. UV index 4 or moderate. Bancroft - Bon Echo Park. Today..Increasing cloudiness. A few showers beginning early this morning and ending this afternoon. Risk of a thunderstorm this morning and early this afternoon. Wind becoming southwest 20 km/h this morning. High 19. UV index 2 or low. Tonight..Cloudy. Clearing near midnight. Low plus 3. Wednesday..Sunny. High 14. UV index 4 or moderate. Brockville - Leeds and Grenville. Today..Becoming cloudy this morning with a few showers. Risk of a thunderstorm this afternoon. Amount 10 to 20 mm. Wind becoming southwest 20 km/h this morning. High 23 with temperature falling to 17 this afternoon. Humidex 27. UV index 2 or low. Tonight..A few showers ending late this evening then partly cloudy. Risk of a thunderstorm early this evening. Low 7. Wednesday..Sunny. High 14. UV index 4 or moderate. City of Ottawa. Today..Increasing cloudiness. A few showers beginning this morning and ending this afternoon then 40 percent chance of showers late this afternoon. Risk of a thunderstorm late this morning and this afternoon. Amount 10 to 20 mm. Wind becoming southwest 20 km/h near noon. High 22 with temperature falling to 16 this afternoon. Humidex 27. UV index 2 or low. Tonight..Cloudy. 40 percent chance of showers early this evening. Clearing after midnight. Low 6. Wednesday..Sunny. Wind becoming northwest 20 km/h in the afternoon. High 13. UV index 4 or moderate. Gatineau. Today..Increasing cloudiness. A few showers beginning this morning and ending this afternoon then 40 percent chance of showers late this afternoon. Risk of a thunderstorm late this morning and this afternoon. Amount 10 to 20 mm. Wind becoming southwest 20 km/h this morning. High 23 with temperature falling to 16 this afternoon. Humidex 26. UV index 2 or low. Tonight..Cloudy. 40 percent chance of showers early this evening. Clearing after midnight. Wind southwest 20 km/h becoming light this evening. Low 6. Wednesday..Sunny. Wind becoming northwest 20 km/h in the afternoon. High 15. UV index 4 or moderate. Prescott and Russell. Today..Increasing cloudiness. A few showers beginning this morning and ending this afternoon then 40 percent chance of showers late this afternoon. Risk of a thunderstorm late this morning and this afternoon. Amount 10 to 20 mm. Wind becoming southwest 20 km/h this morning. High 23 with temperature falling to 16 this afternoon. Humidex 27. UV index 2 or low. Tonight..Cloudy. 40 percent chance of showers early this evening. Clearing after midnight. Low 6. Wednesday..Sunny. Wind becoming northwest 20 km/h late in the morning. High 13. UV index 4 or moderate. Cornwall - Morrisburg. Today..Increasing cloudiness. A few showers beginning late this morning. Risk of a thunderstorm this afternoon. Amount 10 to 20 mm. Wind becoming southwest 20 km/h this morning. High 24 with temperature falling to 17 this afternoon. Humidex 27. UV index 3 or moderate. Tonight..A few showers ending late this evening then partly cloudy. Risk of a thunderstorm early this evening. Low 6. Wednesday..Clearing in the morning. High 14. UV index 4 or moderate. Smiths Falls - Lanark - Sharbot Lake. Today..Increasing cloudiness. A few showers beginning this morning and ending this afternoon then 40 percent chance of showers late this afternoon. Risk of a thunderstorm late this morning and this afternoon. Amount 10 to 20 mm. Wind becoming southwest 20 km/h late this morning. High 21 with temperature falling to 16 this afternoon. Humidex 25. UV index 2 or low. Tonight..Cloudy. 40 percent chance of showers early this evening. Clearing near midnight. Low plus 5. Wednesday..Sunny. High 13. UV index 4 or moderate. Port Carling - Port Severn Bracebridge - Gravenhurst. Today..A few showers ending this morning then cloudy with 60 percent chance of showers. Risk of a thunderstorm early this morning. High 18. UV index 2 or low. Tonight..Clearing this evening. Wind northwest 20 km/h becoming light after midnight. Low plus 4. Wednesday..Sunny. High 13. UV index 4 or moderate. Town of Parry Sound - Rosseau - Killbear Park Huntsville - Baysville. Today..A few showers ending this morning then cloudy with 30 percent chance of showers. Clearing this afternoon. Risk of a thunderstorm early this morning. High 17. UV index 2 or low. Tonight..Clear. Wind northwest 20 km/h becoming light after midnight. Low plus 3. Wednesday..Sunny. High 13. UV index 4 or moderate. Haliburton. Today..Cloudy. A few showers beginning early this morning and ending this afternoon. Risk of a thunderstorm this morning and early this afternoon. High 16. UV index 2 or low. Tonight..Clearing this evening. Low plus 3. Wednesday..Sunny. High 12. UV index 4 or moderate. Renfrew - Pembroke - Barry's Bay. Today..Cloudy. A few showers beginning early this morning and ending this afternoon. Risk of a thunderstorm this morning and early this afternoon. High 19. UV index 2 or low. Tonight..Partly cloudy. Clearing late this evening. Low plus 3. Wednesday..Sunny. High 12. UV index 4 or moderate. Algonquin. Today..A few showers ending this morning then cloudy with 30 percent chance of showers. Clearing this afternoon. Risk of a thunderstorm early this morning. High 16. UV index 2 or low. Tonight..Partly cloudy. Becoming clear this evening. Low plus 3. Wednesday..Sunny. High 11. UV index 4 or moderate. Burk's Falls - Bayfield Inlet. Today..A few showers ending this morning then clearing. Risk of a thunderstorm early this morning. High 17. UV index 2 or low. Tonight..Clear. Low plus 3. Wednesday..Sunny. High 12. UV index 4 or moderate. End $$$$^^ --- up 1 day, 12 hours, 46 minutes * Origin: Northern Realms (618:400/23) .