FPCN11 CWTO 151500
Forecasts for Southern Ontario and the National Capital Region issued
by Environment Canada at 11:00 a.m. EDT Monday 15 September 2025 for
today and Tuesday.
The next scheduled forecast will be issued at 3:30 p.m. EDT.

City of Toronto.
Today..Mainly sunny. High 24. Humidex 26. UV index 6 or high.
Tonight..A few clouds. Low 14.
Tuesday..Sunny. High 24. Humidex 27. UV index 6 or high.

Windsor - Leamington - Essex County.
Today..Mainly sunny. Wind becoming east 20 km/h this afternoon.
 High 27. Humidex 32. UV index 7 or high.
Tonight..A few clouds. Wind east 20 km/h becoming light this evening.
 Low 13.
Tuesday..Sunny. High 27. Humidex 33. UV index 7 or high.

Chatham-Kent - Rondeau Park.
Today..Mainly sunny. Wind east 20 km/h becoming light this afternoon.
 High 26. Humidex 31. UV index 7 or high.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 27. Humidex 33. UV index 7 or high.

Sarnia - Petrolia - Western Lambton County.
Today..Mainly sunny. High 27. Humidex 30. UV index 7 or high.
Tonight..A few clouds. Low 11.
Tuesday..Sunny. High 26. Humidex 31. UV index 7 or high.

Watford - Pinery Park - Eastern Lambton County.
Today..Mainly sunny. High 27. Humidex 30. UV index 7 or high.
Tonight..A few clouds. Low 11.
Tuesday..Sunny. High 27. Humidex 32. UV index 7 or high.

Rodney - Shedden - Western Elgin County.
Today..Mainly sunny. High 26. Humidex 29. UV index 7 or high.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 27. Humidex 31. UV index 7 or high.

St. Thomas - Aylmer - Eastern Elgin County.
Today..Mainly sunny. High 26. Humidex 29. UV index 7 or high.
Tonight..A few clouds. Low 13.
Tuesday..Sunny. High 27. Humidex 31. UV index 7 or high.

Strathroy - Komoka - Western Middlesex County.
Today..Mainly sunny. High 27. Humidex 29. UV index 7 or high.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 28. Humidex 33. UV index 7 or high.

London - Parkhill - Eastern Middlesex County.
Today..Mainly sunny. High 27. Humidex 29. UV index 7 or high.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 28. Humidex 33. UV index 7 or high.

Simcoe - Delhi - Norfolk.
Today..Mainly sunny. High 26. Humidex 29. UV index 7 or high.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 26. Humidex 30. UV index 7 or high.

Dunnville - Caledonia - Haldimand.
Today..Mainly sunny. High 25. Humidex 29. UV index 7 or high.
Tonight..A few clouds. Low 13.
Tuesday..Sunny. High 26. Humidex 31. UV index 7 or high.

Woodstock - Tillsonburg - Oxford County.
Today..Mainly sunny. High 26. Humidex 29. UV index 7 or high.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 27. Humidex 32. UV index 7 or high.

Brantford - County of Brant.
Today..Mainly sunny. High 26. Humidex 29. UV index 7 or high.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 27. Humidex 32. UV index 7 or high.

Niagara Falls - Welland - Southern Niagara Region.
Today..Mainly sunny. High 24. Humidex 28. UV index 7 or high.
Tonight..A few clouds. Low 14.
Tuesday..Sunny. High 25. Humidex 31. UV index 7 or high.

St. Catharines - Grimsby - Northern Niagara Region.
Today..Mainly sunny. Wind becoming northeast 20 km/h this afternoon.
 High 24. Humidex 29. UV index 6 or high.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 25. Humidex 31. UV index 7 or high.

City of Hamilton.
Today..Mainly sunny. High 23. Humidex 28. UV index 7 or high.
Tonight..A few clouds. Low 13.
Tuesday..Sunny. High 23. Humidex 27. UV index 7 or high.

Burlington - Oakville.
Today..Mainly sunny. High 24. Humidex 27. UV index 7 or high.
Tonight..A few clouds. Low 11.
Tuesday..Sunny. High 24. Humidex 28. UV index 7 or high.

Halton Hills - Milton.
Today..Mainly sunny. High 24. Humidex 27. UV index 7 or high.
Tonight..A few clouds. Low 11.
Tuesday..Sunny. High 24. Humidex 28. UV index 7 or high.

Mississauga - Brampton.
Today..Mainly sunny. High 24. Humidex 27. UV index 7 or high.
Tonight..A few clouds. Low 11.
Tuesday..Sunny. High 24. Humidex 28. UV index 7 or high.

Caledon.
Today..Mainly sunny. High 24. Humidex 27. UV index 7 or high.
Tonight..A few clouds. Fog patches developing overnight. Low 11.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 28. UV index 6 or high.

Vaughan - Richmond Hill - Markham.
Today..Mainly sunny. High 25. Humidex 28. UV index 7 or high.
Tonight..A few clouds. Fog patches developing overnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 29. UV index 7 or high.

Newmarket - Georgina - Northern York Region.
Today..Mainly sunny. High 25. Humidex 28. UV index 7 or high.
Tonight..Clear. Fog patches developing overnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 29. UV index 7 or high.

Pickering - Oshawa - Southern Durham Region.
Today..Mainly sunny. High 25. Humidex 28. UV index 7 or high.
Tonight..A few clouds. Fog patches developing overnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 29. UV index 7 or high.

Uxbridge - Beaverton - Northern Durham Region.
Today..Mainly sunny. High 25. Humidex 28. UV index 7 or high.
Tonight..Clear. Fog patches developing overnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 29. UV index 7 or high.

Goderich - Bluewater - Southern Huron County.
Today..Mainly sunny. High 27. Humidex 30. UV index 6 or high.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 27. Humidex 30. UV index 6 or high.

Wingham - Blyth - Northern Huron County.
Today..Mainly sunny. High 27. Humidex 30. UV index 6 or high.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 27. Humidex 30. UV index 6 or high.

Stratford - Mitchell - Southern Perth County.
Today..Mainly sunny. High 27. Humidex 30. UV index 6 or high.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 27. Humidex 30. UV index 6 or high.

Listowel - Milverton - Northern Perth County.
Today..Mainly sunny. High 27. Humidex 30. UV index 6 or high.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 27. Humidex 30. UV index 6 or high.

Kitchener - Cambridge - Region of Waterloo.
Today..Mainly sunny. High 25. Humidex 27. UV index 7 or high.
Tonight..A few clouds. Fog patches developing overnight. Low 11.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 30. UV index 6 or high.

Guelph - Erin - Southern Wellington County.
Today..Mainly sunny. High 25. Humidex 27. UV index 7 or high.
Tonight..A few clouds. Fog patches developing overnight. Low 11.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 30. UV index 6 or high.

Mount Forest - Arthur - Northern Wellington County.
Today..Mainly sunny. High 25. Humidex 27. UV index 7 or high.
Tonight..A few clouds. Fog patches developing overnight. Low 11.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 30. UV index 6 or high.

Orangeville - Grand Valley - Southern Dufferin County.
Today..Mainly sunny. High 25. Humidex 30. UV index 7 or high.
Tonight..A few clouds. Fog patches developing overnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 29. UV index 6 or high.

Shelburne - Mansfield - Northern Dufferin County.
Today..Mainly sunny. High 25. Humidex 30. UV index 7 or high.
Tonight..Clear. Fog patches developing overnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 29. UV index 6 or high.

Innisfil - New Tecumseth - Angus.
Today..Mainly sunny. High 25. Humidex 30. UV index 7 or high.
Tonight..Clear. Fog patches developing overnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 29. UV index 6 or high.

Saugeen Shores - Kincardine - Southern Bruce County.
Today..Mainly sunny. High 26. Humidex 29. UV index 6 or high.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 26. Humidex 28. UV index 6 or high.

Bruce Peninsula - Sauble Beach - Tobermory.
Today..Mainly sunny. High 26. Humidex 29. UV index 6 or high.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 26. Humidex 28. UV index 6 or high.

Hanover - Dundalk - Southern Grey County.
Today..Mainly sunny. High 26. Humidex 29. UV index 6 or high.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 26. Humidex 28. UV index 6 or high.

Owen Sound - Blue Mountains - Northern Grey County.
Today..Mainly sunny. High 26. Humidex 29. UV index 6 or high.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 25. Humidex 27. UV index 6 or high.

Barrie - Collingwood - Hillsdale.
Today..Mainly sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.

Midland - Coldwater - Orr Lake.
Today..Mainly sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.

Orillia - Lagoon City - Washago.
Today..Mainly sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.

Cobourg - Colborne - Western Northumberland County.
Today..Mainly sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing overnight. Low 11.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 29. UV index 6 or high.

Belleville - Quinte West - Eastern Northumberland County.
Today..Sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing overnight. Low 11.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 29. UV index 6 or high.

Picton - Sandbanks Park.
Today..Sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing overnight. Low 11.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.

Napanee - Consecon.
Today..Sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing overnight. Low 11.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 29. UV index 6 or high.

Kingston - Odessa - Frontenac Islands.
Today..Mainly sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 11.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 29. UV index 6 or high.

Lindsay - Southern Kawartha Lakes.
Today..Mainly sunny. High 25. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing overnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 28. UV index 6 or high.

Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes.
Today..Mainly sunny. High 25. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low plus 5.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 27. UV index 6 or high.

Peterborough City - Lakefield - Southern Peterborough County.
Today..Mainly sunny. High 25. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing overnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 28. UV index 6 or high.

Apsley - Woodview - Northern Peterborough County.
Today..Mainly sunny. High 25. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low plus 5.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 27. UV index 6 or high.

Stirling - Tweed - Madoc.
Today..Mainly sunny. High 25. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 10.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 28. UV index 6 or high.

Tamworth - Sydenham - South Frontenac.
Today..Mainly sunny. High 25. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 10.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 28. UV index 6 or high.

Kaladar - Bannockburn - Bon Echo Park.
Today..Mainly sunny. High 25. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 26. UV index 6 or high.

Bancroft - Hastings Highlands - Denbigh.
Today..Mainly sunny. High 25. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 26. UV index 6 or high.

Gananoque - Mallorytown.
Today..Mainly sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 28. UV index 6 or high.

Brockville - Prescott.
Today..Mainly sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 28. UV index 6 or high.

Westport - Charleston Lake.
Today..Mainly sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 28. UV index 6 or high.

Merrickville-Wolford - Kemptville.
Today..Mainly sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 28. UV index 6 or high.

Ottawa North - Kanata - Orl�ans.
Today..Mainly sunny. High 24. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 28. UV index 6 or high.

Ottawa South - Richmond - Metcalfe.
Today..Mainly sunny. High 24. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 28. UV index 6 or high.

Gatineau.
Today..Mainly sunny. High 25. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 28. UV index 6 or high.

Prescott and Russell.
Today..Mainly sunny. High 24. Humidex 26. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 27. UV index 6 or high.

Morrisburg - Long Sault.
Today..Mainly sunny. High 24. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 28. UV index 6 or high.

Cornwall - Lancaster.
Today..Mainly sunny. High 24. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 28. UV index 6 or high.

Winchester - Newington.
Today..Mainly sunny. High 24. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 28. UV index 6 or high.

Maxville - Alexandria.
Today..Mainly sunny. High 24. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 28. UV index 6 or high.

Plevna - Sharbot Lake - Western Lanark County.
Today..Mainly sunny. High 24. Humidex 26. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 26. UV index 6 or high.

Smiths Falls - Perth - Eastern Lanark County.
Today..Mainly sunny. High 24. Humidex 26. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 26. UV index 6 or high.

Port Carling - Port Severn.
Today..Mainly sunny. High 24. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 29. UV index 6 or high.

Bracebridge - Gravenhurst.
Today..Mainly sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 28. UV index 6 or high.

Town of Parry Sound - Rosseau - Killbear Park.
Today..Mainly sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 28. UV index 6 or high.

Huntsville - Baysville.
Today..Mainly sunny. High 25. Humidex 28. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 28. UV index 6 or high.

Haliburton - Minden - Southern Haliburton County.
Today..Mainly sunny. High 23. Humidex 25. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low plus 5.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.

Oxtongue Lake - Fort Irwin - Northern Haliburton County.
Today..Mainly sunny. High 23. Humidex 25. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.

Barry's Bay - Killaloe.
Today..Mainly sunny. High 23. Humidex 25. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low plus 5.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 26. UV index 6 or high.

Renfrew - Arnprior - Calabogie.
Today..Mainly sunny. High 23. Humidex 25. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 26. UV index 6 or high.

Petawawa - Pembroke - Cobden.
Today..Mainly sunny. High 23. Humidex 25. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 26. UV index 6 or high.

Western Algonquin Park - Lake of Two Rivers.
Today..Mainly sunny. High 23. Humidex 25. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low plus 3
 with risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.

Deep River - Whitney - Eastern Algonquin Park.
Today..Mainly sunny. High 23. Humidex 25. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low plus 3
 with risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.

Bayfield Inlet - Dunchurch.
Today..Mainly sunny. High 24. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.

South River - Burk's Falls.
Today..Mainly sunny. High 24. Humidex 27. UV index 6 or high.
Tonight..Clear. Fog patches developing after midnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.

End
$$$$^^

--- up 4 days, 13 hours, 40 minutes
 * Origin: Northern Realms (618:400/23)