FPCN11 CWTO 151930
Forecasts for Southern Ontario and the National Capital Region issued
by Environment Canada at 3:30 p.m. EDT Monday 15 September 2025 for
tonight Tuesday and Tuesday night.
The next scheduled forecast will be issued at 5:00 a.m. EDT Tuesday.

City of Toronto.
Tonight..A few clouds. Low 13.
Tuesday..Sunny. High 25. Humidex 27. UV index 6 or high.
Tuesday night..Clear. Low 13.

Windsor - Leamington - Essex County.
Tonight..A few clouds. Low 13.
Tuesday..Sunny. High 27. Humidex 33. UV index 7 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 13.

Chatham-Kent - Rondeau Park.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 27. Humidex 33. UV index 7 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 13.

Sarnia - Petrolia - Western Lambton County.
Tonight..A few clouds. Low 11.
Tuesday..Sunny. High 26. Humidex 29. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 12.

Watford - Pinery Park - Eastern Lambton County.
Tonight..A few clouds. Low 11.
Tuesday..Sunny. High 27. Humidex 30. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 11.

Rodney - Shedden - Western Elgin County.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 27. Humidex 30. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 12.

St. Thomas - Aylmer - Eastern Elgin County.
Tonight..A few clouds. Low 13.
Tuesday..Sunny. High 27. Humidex 30. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 12.

Strathroy - Komoka - Western Middlesex County.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 28. Humidex 31. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 11.

London - Parkhill - Eastern Middlesex County.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 28. Humidex 31. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 10.

Simcoe - Delhi - Norfolk.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 27. Humidex 31. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 11.

Dunnville - Caledonia - Haldimand.
Tonight..A few clouds. Low 13.
Tuesday..Sunny. High 26. Humidex 31. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 12.

Woodstock - Tillsonburg - Oxford County.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 26. Humidex 29. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 10.

Brantford - County of Brant.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 26. Humidex 29. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 10.

Niagara Falls - Welland - Southern Niagara Region.
Tonight..A few clouds. Low 14.
Tuesday..Sunny. High 25. Humidex 30. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 14.

St. Catharines - Grimsby - Northern Niagara Region.
Tonight..A few clouds. Low 12.
Tuesday..Mainly sunny. High 25. Humidex 30. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 12.

City of Hamilton.
Tonight..A few clouds. Low 12.
Tuesday..Sunny. High 24. Humidex 27. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 12.

Burlington - Oakville.
Tonight..A few clouds. Low 11.
Tuesday..A mix of sun and cloud. Becoming sunny in the morning.
 High 25. Humidex 27. UV index 6 or high.
Tuesday night..Clear. Low 11.

Halton Hills - Milton.
Tonight..A few clouds. Low 11.
Tuesday..Sunny. High 25. Humidex 27. UV index 6 or high.
Tuesday night..Clear. Low 11.

Mississauga - Brampton.
Tonight..A few clouds. Low 11.
Tuesday..Sunny. High 25. Humidex 27. UV index 6 or high.
Tuesday night..Clear. Low 11.

Caledon.
Tonight..A few clouds. Fog patches developing overnight. Low 11.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 10.

Vaughan - Richmond Hill - Markham.
Tonight..A few clouds. Fog patches developing overnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 26. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 10.

Newmarket - Georgina - Northern York Region.
Tonight..A few clouds. Fog patches developing overnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 26. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Pickering - Oshawa - Southern Durham Region.
Tonight..A few clouds. Fog patches developing overnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Uxbridge - Beaverton - Northern Durham Region.
Tonight..A few clouds. Fog patches developing overnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 8.

Goderich - Bluewater - Southern Huron County.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 27. Humidex 29. UV index 6 or high.
Tuesday night..Clear. Low 9.

Wingham - Blyth - Northern Huron County.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 26. Humidex 28. UV index 6 or high.
Tuesday night..Clear. Low 9.

Stratford - Mitchell - Southern Perth County.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 27. Humidex 29. UV index 6 or high.
Tuesday night..Clear. Low 9.

Listowel - Milverton - Northern Perth County.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 26. Humidex 28. UV index 6 or high.
Tuesday night..Clear. Low 9.

Kitchener - Cambridge - Region of Waterloo.
Tonight..A few clouds. Fog patches developing overnight. Low 11.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 29. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Guelph - Erin - Southern Wellington County.
Tonight..A few clouds. Fog patches developing overnight. Low 11.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 28. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 10.

Mount Forest - Arthur - Northern Wellington County.
Tonight..A few clouds. Fog patches developing overnight. Low 11.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 28. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Orangeville - Grand Valley - Southern Dufferin County.
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.
Tuesday night..Clear. Fog patches developing overnight. Low 8.

Shelburne - Mansfield - Northern Dufferin County.
Tonight..A few clouds. Fog patches developing overnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 28. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 8.

Innisfil - New Tecumseth - Angus.
Tonight..A few clouds. Fog patches developing overnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 28. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 8.

Saugeen Shores - Kincardine - Southern Bruce County.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 25. Humidex 27. UV index 6 or high.
Tuesday night..Clear. Low 11.

Bruce Peninsula - Sauble Beach - Tobermory.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 25. Humidex 27. UV index 6 or high.
Tuesday night..Clear. Low 11.

Hanover - Dundalk - Southern Grey County.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 25. Humidex 27. UV index 6 or high.
Tuesday night..Clear. Low 10.

Owen Sound - Blue Mountains - Northern Grey County.
Tonight..A few clouds. Low 10.
Tuesday..Sunny. High 25. Humidex 27. UV index 6 or high.
Tuesday night..Clear. Low 11.

Barrie - Collingwood - Hillsdale.
Tonight..Clear. Fog patches developing after midnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 26. UV index 6 or high.
Tuesday night..Clear. Fog patches developing after midnight. Low 10.

Midland - Coldwater - Orr Lake.
Tonight..Clear. Fog patches developing after midnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 26. UV index 6 or high.
Tuesday night..Clear. Fog patches developing after midnight. Low 10.

Orillia - Lagoon City - Washago.
Tonight..Clear. Fog patches developing after midnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 26. UV index 6 or high.
Tuesday night..Clear. Fog patches developing after midnight. Low 10.

Cobourg - Colborne - Western Northumberland County.
Tonight..A few clouds. Fog patches developing overnight. Low 10.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 10.

Belleville - Quinte West - Eastern Northumberland County.
Tonight..Clear. Fog patches developing overnight. Low 10.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 28. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 10.

Picton - Sandbanks Park.
Tonight..Clear. Low 11.
Tuesday..Sunny. High 24. Humidex 27. UV index 6 or high.
Tuesday night..Clear. Low 10.

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

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

Lindsay - Southern Kawartha Lakes.
Tonight..A few clouds. Fog patches developing overnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 28. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 7.

Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 7.

Peterborough City - Lakefield - Southern Peterborough County.
Tonight..A few clouds. Fog patches developing overnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 28. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 7.

Apsley - Woodview - Northern Peterborough County.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 7.

Stirling - Tweed - Madoc.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 10.

Tamworth - Sydenham - South Frontenac.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 10.

Kaladar - Bannockburn - Bon Echo Park.
Tonight..Clear. Fog patches developing after midnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 27. UV index 6 or high.
Tuesday night..Clear. Fog patches developing after midnight. Low 9.

Bancroft - Hastings Highlands - Denbigh.
Tonight..Clear. Fog patches developing after midnight. Low plus 3
 with risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 27. UV index 6 or high.
Tuesday night..Clear. Fog patches developing after midnight. Low 6.

Gananoque - Mallorytown.
Tonight..Clear. Fog patches developing after midnight. Low 10.
Tuesday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 29. UV index 6 or high.
Tuesday night..Clear. Fog patches developing after midnight. Low 9.

Brockville - Prescott.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 9.

Westport - Charleston Lake.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 9.

Merrickville-Wolford - Kemptville.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 9.

Ottawa North - Kanata - Orl�ans.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 9.

Ottawa South - Richmond - Metcalfe.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 9.

Gatineau.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 10.

Prescott and Russell.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 9.

Morrisburg - Long Sault.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 9.

Cornwall - Lancaster.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 8.

Winchester - Newington.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 9.

Maxville - Alexandria.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 8.

Plevna - Sharbot Lake - Western Lanark County.
Tonight..Clear. Fog patches developing after midnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 27. UV index 6 or high.
Tuesday night..Clear. Fog patches developing after midnight. Low 9.

Smiths Falls - Perth - Eastern Lanark County.
Tonight..Clear. Fog patches developing after midnight. Low 9.
Tuesday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 27. UV index 6 or high.
Tuesday night..Clear. Fog patches developing after midnight. Low 9.

Port Carling - Port Severn.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 8.

Bracebridge - Gravenhurst.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 8.

Town of Parry Sound - Rosseau - Killbear Park.
Tonight..A few clouds. Fog patches developing after midnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 27. UV index 6 or high.
Tuesday night..Clear. Fog patches developing after midnight. Low 10.

Huntsville - Baysville.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 10.

Haliburton - Minden - Southern Haliburton County.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 6.

Oxtongue Lake - Fort Irwin - Northern Haliburton County.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 6.

Barry's Bay - Killaloe.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 7.

Renfrew - Arnprior - Calabogie.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 8.

Petawawa - Pembroke - Cobden.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 7.

Western Algonquin Park - Lake of Two Rivers.
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 26. UV index 6 or high.
Tuesday night..Clear. Fog patches developing after midnight. Low
 plus 5.

Deep River - Whitney - Eastern Algonquin Park.
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 26. UV index 6 or high.
Tuesday night..Clear. Fog patches developing after midnight. Low
 plus 5.

Bayfield Inlet - Dunchurch.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 8.

South River - Burk's Falls.
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.
Tuesday night..Clear. Fog patches developing after midnight. Low 8.

End
$$$$^^

--- up 4 days, 18 hours, 10 minutes
 * Origin: Northern Realms (618:400/23)