Subj : Southern Ontario Weather To : All From : Northern Realms Date : Tue Jul 07 2026 05:05:06 FPCN11 CWTO 070900 Forecasts for Southern Ontario and the National Capital Region issued by Environment Canada at 5:00 a.m. EDT Tuesday 7 July 2026 for today and Wednesday. The next scheduled forecast will be issued at 11:00 a.m. EDT. City of Toronto. Today..Sunny. Fog patches dissipating early this morning. High 28. Humidex 34. UV index 8 or very high. Tonight..Clear. Low 19. Wednesday..A mix of sun and cloud. High 30. Humidex 38. UV index 9 or very high. Windsor - Leamington - Essex County. Today..A mix of sun and cloud. Clearing late this morning. High 29. Humidex 37. UV index 9 or very high. Tonight..Clear. Low 18. Wednesday..Sunny. High 30. Humidex 36. UV index 9 or very high. Chatham-Kent - Rondeau Park. Today..A mix of sun and cloud. Clearing late this morning. High 29. Humidex 37. UV index 9 or very high. Tonight..Clear. Low 18. Wednesday..Sunny. High 30. Humidex 36. UV index 9 or very high. Sarnia - Petrolia - Western Lambton County. Today..Mainly sunny. High 29. Humidex 37. UV index 9 or very high. Tonight..A few clouds. Wind north 20 km/h becoming light late this evening. Low 18. Wednesday..Mainly sunny. High 30. Humidex 36. UV index 9 or very high. Watford - Pinery Park - Eastern Lambton County. Today..Mainly sunny. High 29. Humidex 37. UV index 9 or very high. Tonight..A few clouds. Wind north 20 km/h becoming light late this evening. Low 18. Wednesday..Mainly sunny. High 30. Humidex 36. UV index 9 or very high. Rodney - Shedden - Western Elgin County. Today..A mix of sun and cloud. 30 percent chance of showers this afternoon. High 29. Humidex 37. UV index 9 or very high. Tonight..Partly cloudy with 30 percent chance of showers early this evening then clear. Low 17. Wednesday..Sunny. High 29. Humidex 38. UV index 9 or very high. St. Thomas - Aylmer - Eastern Elgin County. Today..A mix of sun and cloud. 30 percent chance of showers this afternoon. High 29. Humidex 37. UV index 9 or very high. Tonight..Partly cloudy with 30 percent chance of showers early this evening then clear. Low 17. Wednesday..Mainly sunny. High 29. Humidex 38. UV index 9 or very high. Strathroy - Komoka - Western Middlesex County. Today..A mix of sun and cloud. 30 percent chance of showers this afternoon. High 29. Humidex 37. UV index 9 or very high. Tonight..Partly cloudy with 30 percent chance of showers early this evening then clear. Low 16. Wednesday..Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers late in the afternoon. High 31. Humidex 37. UV index 9 or very high. London - Parkhill - Eastern Middlesex County. Today..A mix of sun and cloud. 30 percent chance of showers this afternoon. High 29. Humidex 37. UV index 9 or very high. Tonight..Partly cloudy with 30 percent chance of showers early this evening then clear. Low 16. Wednesday..A mix of sun and cloud. 30 percent chance of showers late in the afternoon. High 31. Humidex 37. UV index 9 or very high. Simcoe - Delhi - Norfolk. Today..Becoming a mix of sun and cloud this morning. 30 percent chance of showers late this afternoon. Fog patches dissipating early this morning. High 28. Humidex 36. UV index 9 or very high. Tonight..Partly cloudy with 30 percent chance of showers early this evening then clear. Low 15. Wednesday..Sunny. Becoming a mix of sun and cloud in the morning. High 30. Humidex 38. UV index 9 or very high. Dunnville - Caledonia - Haldimand. Today..A mix of sun and cloud. 30 percent chance of showers late this afternoon. Fog patches dissipating early this morning. High 27. Humidex 36. UV index 9 or very high. Tonight..Partly cloudy with 30 percent chance of showers early this evening then clear. Low 16. Wednesday..Mainly sunny. High 30. Humidex 38. UV index 9 or very high. Woodstock - Tillsonburg - Oxford County. Today..Mainly cloudy. Clearing this afternoon. Wind becoming east 20 km/h late this afternoon. High 28. Humidex 36. UV index 8 or very high. Tonight..Clear. Wind east 20 km/h becoming light this evening. Low 16. Wednesday..Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers late in the afternoon. High 30. Humidex 38. UV index 9 or very high. Brantford - County of Brant. Today..Mainly cloudy. Clearing this afternoon. Fog patches dissipating early this morning. Wind becoming east 20 km/h late this afternoon. High 28. Humidex 36. UV index 8 or very high. Tonight..Clear. Wind east 20 km/h becoming light this evening. Low 16. Wednesday..Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers late in the afternoon. High 30. Humidex 38. UV index 9 or very high. Niagara Falls - Welland - Southern Niagara Region. Today..A mix of sun and cloud. 30 percent chance of showers late this afternoon. High 26. Humidex 36. UV index 8 or very high. Tonight..Partly cloudy with 30 percent chance of showers early this evening then clear. Low 23. Wednesday..A mix of sun and cloud. Clearing late in the morning. High 30. Humidex 38. UV index 9 or very high. St. Catharines - Grimsby - Northern Niagara Region. Today..A mix of sun and cloud. 30 percent chance of showers late this afternoon. Fog patches dissipating early this morning. Wind becoming northeast 20 km/h late this morning. High 26. Humidex 34. UV index 8 or very high. Tonight..Partly cloudy with 30 percent chance of showers early this evening then clear. Wind northeast 20 km/h becoming light this evening. Low 18. Wednesday..A mix of sun and cloud. High 30. Humidex 38. UV index 9 or very high. City of Hamilton. Today..Clearing late this morning. Fog patches dissipating early this morning. Wind becoming northeast 20 km/h late this morning. High 25. Humidex 32. UV index 8 or very high. Tonight..Clear. Wind northeast 20 km/h becoming light this evening. Low 17. Wednesday..Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers late in the afternoon. High 30. Humidex 38. UV index 9 or very high. Burlington - Oakville. Today..Clearing late this morning. Fog patches dissipating early this morning. Wind becoming northeast 20 km/h this afternoon. High 24. Humidex 31. UV index 8 or very high. Tonight..Clear. Low 17. Wednesday..A mix of sun and cloud. High 29. Humidex 37. UV index 9 or very high. Halton Hills - Milton. Today..Mainly cloudy. Clearing near noon. Fog patches dissipating early this morning. High 27. Humidex 33. UV index 7 or high. Tonight..Clear. Low 16. Wednesday..A mix of sun and cloud. High 30. Humidex 38. UV index 9 or very high. Mississauga - Brampton. Today..Mainly cloudy. Clearing near noon. Fog patches dissipating early this morning. High 28. Humidex 34. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..A mix of sun and cloud. High 30. Humidex 38. UV index 9 or very high. Caledon. Today..Mainly cloudy. Clearing near noon. High 28. Humidex 34. UV index 7 or high. Tonight..Clear. Low 16. Wednesday..A mix of sun and cloud. 30 percent chance of showers late in the afternoon. High 30. Humidex 38. UV index 9 or very high. Vaughan - Richmond Hill - Markham. Today..A mix of sun and cloud. Becoming sunny near noon. Fog patches dissipating early this morning. High 29. Humidex 35. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..A mix of sun and cloud. 30 percent chance of showers late in the afternoon. High 30. Humidex 36. UV index 9 or very high. Newmarket - Georgina - Northern York Region. Today..A mix of sun and cloud. Becoming sunny near noon. High 29. Humidex 35. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..A mix of sun and cloud. 30 percent chance of showers late in the afternoon. High 30. Humidex 36. UV index 9 or very high. Pickering - Oshawa - Southern Durham Region. Today..Sunny. High 29. Humidex 35. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..Mainly sunny. High 30. Humidex 36. UV index 9 or very high. Uxbridge - Beaverton - Northern Durham Region. Today..Sunny. High 29. Humidex 35. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..A mix of sun and cloud. 30 percent chance of showers late in the afternoon. High 30. Humidex 36. UV index 9 or very high. Goderich - Bluewater - Southern Huron County. Today..A mix of sun and cloud. 40 percent chance of showers late this afternoon. High 29. Humidex 36. UV index 9 or very high. Tonight..Partly cloudy with 40 percent chance of showers early this evening. Clearing this evening. Low 18. Wednesday..Sunny. High 31. Humidex 34. UV index 9 or very high. Wingham - Blyth - Northern Huron County. Today..A mix of sun and cloud. 40 percent chance of showers late this afternoon. High 29. Humidex 36. UV index 9 or very high. Tonight..Partly cloudy with 40 percent chance of showers early this evening then clear. Low 18. Wednesday..Sunny. High 30. Humidex 34. UV index 9 or very high. Stratford - Mitchell - Southern Perth County. Today..A mix of sun and cloud. High 29. Humidex 37. UV index 8 or very high. Tonight..Partly cloudy with 30 percent chance of showers this evening. Becoming clear late this evening and overnight. Low 16. Wednesday..Sunny in the morning then a mix of sun and cloud with 40 percent chance of showers in the afternoon. High 30. Humidex 36. UV index 9 or very high. Listowel - Milverton - Northern Perth County. Today..Mainly sunny. High 29. Humidex 37. UV index 8 or very high. Tonight..Partly cloudy with 30 percent chance of showers this evening. Becoming clear late this evening and overnight. Low 16. Wednesday..Sunny in the morning and early in the afternoon then a mix of sun and cloud with 40 percent chance of showers in the afternoon. High 30. Humidex 36. UV index 9 or very high. Kitchener - Cambridge - Region of Waterloo. Today..Mainly cloudy. Clearing near noon. Wind becoming east 20 km/h late this afternoon. High 28. Humidex 35. UV index 7 or high. Tonight..Clear. Wind east 20 km/h becoming light this evening. Low 15. Wednesday..Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers late in the afternoon. High 30. Humidex 38. UV index 9 or very high. Guelph - Erin - Southern Wellington County. Today..Mainly cloudy. Clearing near noon. Wind becoming east 20 km/h late this afternoon. High 27. Humidex 34. UV index 7 or high. Tonight..Clear. Wind east 20 km/h becoming light this evening. Low 15. Wednesday..Sunny early in the morning then a mix of sun and cloud with 30 percent chance of showers late in the afternoon. High 30. Humidex 38. UV index 9 or very high. Mount Forest - Arthur - Northern Wellington County. Today..A mix of sun and cloud. Becoming sunny near noon. High 28. Humidex 34. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..Sunny in the morning and early in the afternoon then a mix of sun and cloud with 40 percent chance of showers in the afternoon. High 29. Humidex 32. UV index 9 or very high. Orangeville - Grand Valley - Southern Dufferin County. Today..Mainly cloudy. Clearing near noon. High 27. Humidex 36. UV index 7 or high. Tonight..Clear. Low 16. Wednesday..A mix of sun and cloud. 40 percent chance of showers in the afternoon. High 29. Humidex 35. UV index 9 or very high. Shelburne - Mansfield - Northern Dufferin County. Today..A mix of sun and cloud. Clearing this afternoon. High 27. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..Sunny in the morning and early in the afternoon then a mix of sun and cloud with 40 percent chance of showers in the afternoon. High 29. Humidex 35. UV index 9 or very high. Innisfil - New Tecumseth - Angus. Today..Mainly cloudy. Clearing near noon. High 29. Humidex 38. UV index 7 or high. Tonight..Clear. Low 16. Wednesday..A mix of sun and cloud. 40 percent chance of showers in the afternoon. High 30. Humidex 36. UV index 9 or very high. Saugeen Shores - Kincardine - Southern Bruce County. Today..Sunny. A mix of sun and cloud late this afternoon with 40 percent chance of showers. Wind becoming northwest 20 km/h this afternoon. High 28. Humidex 36. UV index 9 or very high. Tonight..Partly cloudy with 40 percent chance of showers early this evening then clear. Wind northwest 20 km/h becoming light this evening. Low 19. Wednesday..Sunny. High 28. Humidex 31. UV index 9 or very high. Bruce Peninsula - Sauble Beach - Tobermory. Today..Mainly sunny. High 28. Humidex 37. UV index 9 or very high. Tonight..Clear. Low 17. Wednesday..Mainly sunny. Increasing cloudiness late in the morning. High 30. Humidex 33. UV index 8 or very high. Hanover - Dundalk - Southern Grey County. Today..A mix of sun and cloud. 40 percent chance of showers late this afternoon. High 28. Humidex 37. UV index 8 or very high. Tonight..Partly cloudy with 40 percent chance of showers early this evening then clear. Low 17. Wednesday..Sunny. High 29. Humidex 33. UV index 8 or very high. Owen Sound - Blue Mountains - Northern Grey County. Today..Sunny. High 28. Humidex 36. UV index 9 or very high. Tonight..Clear. Low 17. Wednesday..Sunny. High 28. Humidex 33. UV index 9 or very high. Barrie - Collingwood - Hillsdale. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..Sunny. High 29. Humidex 36. UV index 9 or very high. Midland - Coldwater - Orr Lake. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..A mix of sun and cloud. Becoming sunny in the morning. High 29. Humidex 36. UV index 9 or very high. Orillia - Lagoon City - Washago. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..Mainly sunny. High 29. Humidex 36. UV index 9 or very high. Cobourg - Colborne - Western Northumberland County. Today..A mix of sun and cloud. Becoming sunny this morning. High 29. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 17. Wednesday..Clearing. High 29. Humidex 36. UV index 9 or very high. Belleville - Quinte West - Eastern Northumberland County. Today..A mix of sun and cloud. Becoming sunny this morning. High 29. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 17. Wednesday..Clearing. High 29. Humidex 36. UV index 9 or very high. Picton - Sandbanks Park. Today..A mix of sun and cloud. Becoming sunny this morning. High 29. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 17. Wednesday..Clearing. High 29. Humidex 36. UV index 9 or very high. Napanee - Consecon. Today..A mix of sun and cloud. Becoming sunny this morning. High 29. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 17. Wednesday..Clearing. High 29. Humidex 36. UV index 9 or very high. Kingston - Odessa - Frontenac Islands. Today..A mix of sun and cloud. Becoming sunny this morning. High 29. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 17. Wednesday..A mix of sun and cloud. Clearing late in the morning. High 29. Humidex 36. UV index 9 or very high. Lindsay - Southern Kawartha Lakes. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 15. Wednesday..Mainly sunny. High 30. Humidex 36. UV index 9 or very high. Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 15. Wednesday..Mainly sunny. High 30. Humidex 36. UV index 9 or very high. Peterborough City - Lakefield - Southern Peterborough County. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 15. Wednesday..Mainly sunny. High 30. Humidex 36. UV index 9 or very high. Apsley - Woodview - Northern Peterborough County. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 15. Wednesday..A mix of sun and cloud. High 30. Humidex 36. UV index 9 or very high. Stirling - Tweed - Madoc. Today..Sunny. High 30. Humidex 37. UV index 8 or very high. Tonight..A few clouds. Low 18. Wednesday..A mix of sun and cloud. High 30. Humidex 36. UV index 9 or very high. Tamworth - Sydenham - South Frontenac. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..A few clouds. Low 18. Wednesday..A mix of sun and cloud. High 30. Humidex 36. UV index 9 or very high. Kaladar - Bannockburn - Bon Echo Park. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 15. Wednesday..A mix of sun and cloud. High 30. Humidex 36. UV index 9 or very high. Bancroft - Hastings Highlands - Denbigh. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 15. Wednesday..Mainly sunny. High 30. Humidex 36. UV index 9 or very high. Gananoque - Mallorytown. Today..Sunny. High 30. Humidex 37. UV index 8 or very high. Tonight..Clear. Low 18. Wednesday..A mix of sun and cloud. High 30. Humidex 36. UV index 9 or very high. Brockville - Prescott. Today..Sunny. High 30. Humidex 37. UV index 8 or very high. Tonight..Clear. Low 18. Wednesday..Mainly sunny. High 30. Humidex 36. UV index 9 or very high. Westport - Charleston Lake. Today..Sunny. High 30. Humidex 37. UV index 8 or very high. Tonight..Clear. Low 18. Wednesday..A mix of sun and cloud. High 30. Humidex 36. UV index 9 or very high. Merrickville-Wolford - Kemptville. Today..Sunny. High 30. Humidex 37. UV index 8 or very high. Tonight..Clear. Low 18. Wednesday..A mix of sun and cloud. High 31. Humidex 37. UV index 9 or very high. Ottawa North - Kanata - Orl‚ans. Today..Sunny. High 29. Humidex 35. UV index 8 or very high. Tonight..Clear. Low 18. Wednesday..A mix of sun and cloud. High 30. Humidex 37. UV index 9 or very high. Ottawa South - Richmond - Metcalfe. Today..Sunny. High 29. Humidex 35. UV index 8 or very high. Tonight..Clear. Low 18. Wednesday..A mix of sun and cloud. High 30. Humidex 37. UV index 9 or very high. Gatineau. Today..Sunny. High 29. Humidex 35. UV index 7 or high. Tonight..Clear. Low 17. Wednesday..A mix of sun and cloud. High 30. Humidex 37. UV index 9 or very high. Prescott and Russell. Today..Sunny. High 29. Humidex 37. UV index 8 or very high. Tonight..Clear. Low 19. Wednesday..A mix of sun and cloud. High 30. Humidex 37. UV index 9 or very high. Morrisburg - Long Sault. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..A few clouds. Low 19. Wednesday..Mainly sunny. High 30. Humidex 36. UV index 9 or very high. Cornwall - Lancaster. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..A few clouds. Low 19. Wednesday..Mainly sunny. High 30. Humidex 36. UV index 9 or very high. Winchester - Newington. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..A few clouds. Low 19. Wednesday..Mainly sunny. High 30. Humidex 36. UV index 9 or very high. Maxville - Alexandria. Today..Sunny. High 29. Humidex 35. UV index 7 or high. Tonight..Clear. Low 17. Wednesday..Mainly sunny. High 30. Humidex 37. UV index 9 or very high. Plevna - Sharbot Lake - Western Lanark County. Today..Sunny. High 30. Humidex 37. UV index 8 or very high. Tonight..Clear. Low 18. Wednesday..A mix of sun and cloud. High 30. Humidex 36. UV index 9 or very high. Smiths Falls - Perth - Eastern Lanark County. Today..Sunny. High 30. Humidex 37. UV index 8 or very high. Tonight..Clear. Low 18. Wednesday..A mix of sun and cloud. High 30. Humidex 36. UV index 9 or very high. Port Carling - Port Severn. Today..Sunny. High 29. Humidex 35. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..A mix of sun and cloud. Becoming sunny in the morning. High 30. Humidex 34. UV index 9 or very high. Bracebridge - Gravenhurst. Today..Sunny. High 29. Humidex 35. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..Mainly sunny. High 30. Humidex 34. UV index 9 or very high. Town of Parry Sound - Rosseau - Killbear Park. Today..Sunny. High 29. Humidex 35. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..Sunny. Increasing cloudiness in the afternoon. High 30. Humidex 34. UV index 9 or very high. Huntsville - Baysville. Today..Sunny. High 30. Humidex 36. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..Mainly sunny. High 30. Humidex 34. UV index 9 or very high. Haliburton - Minden - Southern Haliburton County. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..A few clouds. Low 18. Wednesday..Mainly sunny. High 29. Humidex 34. UV index 9 or very high. Oxtongue Lake - Fort Irwin - Northern Haliburton County. Today..Sunny. High 29. Humidex 36. UV index 8 or very high. Tonight..A few clouds. Low 18. Wednesday..Mainly sunny. High 29. Humidex 34. UV index 9 or very high. Barry's Bay - Killaloe. Today..Sunny. High 29. Humidex 34. UV index 8 or very high. Tonight..Clear. Low 18. Wednesday..Sunny. Becoming a mix of sun and cloud late in the morning. High 30. Humidex 35. UV index 9 or very high. Renfrew - Arnprior - Calabogie. Today..Sunny. High 29. Humidex 34. UV index 8 or very high. Tonight..Clear. Low 18. Wednesday..A mix of sun and cloud. High 30. Humidex 35. UV index 9 or very high. Petawawa - Pembroke - Cobden. Today..Sunny. High 29. Humidex 34. UV index 8 or very high. Tonight..Clear. Low 18. Wednesday..Mainly sunny. Increasing cloudiness late in the morning. High 30. Humidex 35. UV index 9 or very high. Western Algonquin Park - Lake of Two Rivers. Today..Sunny. High 29. Humidex 34. UV index 8 or very high. Tonight..Partly cloudy. Becoming clear near midnight. Low 14. Wednesday..Mainly sunny. High 30. Humidex 35. UV index 9 or very high. Deep River - Whitney - Eastern Algonquin Park. Today..Sunny. High 29. Humidex 34. UV index 8 or very high. Tonight..Partly cloudy. Becoming clear near midnight. Low 14. Wednesday..Sunny. High 30. Humidex 35. UV index 9 or very high. Bayfield Inlet - Dunchurch. Today..Sunny. High 29. Humidex 33. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..Mainly sunny. Increasing cloudiness early in the afternoon. High 29. Humidex 33. UV index 9 or very high. South River - Burk's Falls. Today..Sunny. High 29. Humidex 33. UV index 8 or very high. Tonight..Clear. Low 16. Wednesday..Mainly sunny. Increasing cloudiness early in the afternoon. High 29. Humidex 33. UV index 9 or very high. End $$$$^^ --- up 18 hours, 41 minutes * Origin: Northern Realms (618:400/23) .