FPCN11 CWTO 081930
Forecasts for Southern Ontario and the National Capital Region issued
by Environment Canada at 3:30 p.m. EDT Monday 8 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..Clearing early this evening. Low 9.
Tuesday..Sunny. High 23. UV index 6 or high.
Tuesday night..Clear. Low 11.

Windsor - Leamington - Essex County.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 24. UV
 index 7 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 11.

Chatham-Kent - Rondeau Park.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 7 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 11.

Sarnia - Petrolia - Western Lambton County.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23.
 Humidex 25. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 10.

Watford - Pinery Park - Eastern Lambton County.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 7 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Rodney - Shedden - Western Elgin County.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 7 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 11.

St. Thomas - Aylmer - Eastern Elgin County.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 7 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 11.

Strathroy - Komoka - Western Middlesex County.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 7 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

London - Parkhill - Eastern Middlesex County.
Tonight..Clearing. Fog patches developing overnight. Low plus 5.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 7 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Simcoe - Delhi - Norfolk.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 7 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 8.

Dunnville - Caledonia - Haldimand.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 7 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Woodstock - Tillsonburg - Oxford County.
Tonight..Partly cloudy. Clearing this evening. Fog patches developing
 overnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 7.

Brantford - County of Brant.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 7.

Niagara Falls - Welland - Southern Niagara Region.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 7 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 12.

St. Catharines - Grimsby - Northern Niagara Region.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23.
 Humidex 25. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 11.

City of Hamilton.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 8.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 7 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Burlington - Oakville.
Tonight..Clearing early this evening. Low 8.
Tuesday..Sunny. High 23. Humidex 25. UV index 6 or high.
Tuesday night..Clear. Low 9.

Halton Hills - Milton.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23.
 Humidex 25. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Mississauga - Brampton.
Tonight..Clearing early this evening. Low 8.
Tuesday..Sunny. High 23. Humidex 25. UV index 6 or high.
Tuesday night..Clear. Low 9.

Caledon.
Tonight..Clearing. Fog patches developing overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Vaughan - Richmond Hill - Markham.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing overnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Low 9.

Newmarket - Georgina - Northern York Region.
Tonight..Partly cloudy. Clearing this evening. Fog patches developing
 overnight. Low plus 5.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Pickering - Oshawa - Southern Durham Region.
Tonight..Clear. Fog patches developing overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Low 9.

Uxbridge - Beaverton - Northern Durham Region.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing overnight. Low plus 5.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Goderich - Bluewater - Southern Huron County.
Tonight..Clear. Fog patches developing overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. Wind becoming
 southwest 20 km/h late in the morning. High 23. UV index 6 or high.
Tuesday night..Clear. Low 7.

Wingham - Blyth - Northern Huron County.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Becoming a mix of sun and cloud in the afternoon. Fog
 patches dissipating in the morning. Wind becoming southwest 20 km/h
 late in the morning. High 22. UV index 6 or high.
Tuesday night..Clear. Low 7.

Stratford - Mitchell - Southern Perth County.
Tonight..Partly cloudy. Clearing this evening. Fog patches developing
 overnight. Low plus 5.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 7.

Listowel - Milverton - Northern Perth County.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 5.
Tuesday..Sunny. Becoming a mix of sun and cloud in the afternoon. Fog
 patches dissipating in the morning. High 22. UV index 6 or high.
Tuesday night..Clear. Low 7.

Kitchener - Cambridge - Region of Waterloo.
Tonight..Partly cloudy. Clearing this evening. Fog patches developing
 overnight. Low plus 4.
Tuesday..Sunny. Becoming a mix of sun and cloud in the afternoon. Fog
 patches dissipating in the morning. High 23. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 7.

Guelph - Erin - Southern Wellington County.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing overnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 7.

Mount Forest - Arthur - Northern Wellington County.
Tonight..Clearing. Fog patches developing overnight. Low plus 5.
Tuesday..Sunny. Becoming a mix of sun and cloud in the afternoon. Fog
 patches dissipating in the morning. High 22. UV index 6 or high.
Tuesday night..Clear. Low 7.

Orangeville - Grand Valley - Southern Dufferin County.
Tonight..Partly cloudy. Clearing this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Low 8.

Shelburne - Mansfield - Northern Dufferin County.
Tonight..Partly cloudy. Clearing this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Becoming a mix of sun and cloud in the afternoon. Fog
 patches dissipating in the morning. High 22. UV index 6 or high.
Tuesday night..Clear. Low 8.

Innisfil - New Tecumseth - Angus.
Tonight..Partly cloudy. Clearing this evening. Fog patches developing
 overnight. Low plus 5.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 8.

Saugeen Shores - Kincardine - Southern Bruce County.
Tonight..Clear. Fog patches developing overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. Wind becoming
 south 20 km/h late in the morning. High 22. UV index 6 or high.
Tuesday night..Clear. Wind becoming south 20 km/h near midnight.
 Low 10.

Bruce Peninsula - Sauble Beach - Tobermory.
Tonight..Clear. Wind southwest 20 km/h becoming light early this
 evening. Low 8.
Tuesday..Sunny. Wind becoming south 20 km/h gusting to 40 in the
 morning. High 21. UV index 6 or high.
Tuesday night..Clear. Wind becoming south 20 km/h near midnight.
 Low 12.

Hanover - Dundalk - Southern Grey County.
Tonight..Partly cloudy. Clearing this evening. Fog patches developing
 overnight. Low plus 5.
Tuesday..Sunny. Becoming a mix of sun and cloud in the afternoon. Fog
 patches dissipating in the morning. High 21. UV index 6 or high.
Tuesday night..Clear. Low 10.

Owen Sound - Blue Mountains - Northern Grey County.
Tonight..Clear. Fog patches developing overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. Wind becoming
 southwest 20 km/h gusting to 40 late in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Low 10.

Barrie - Collingwood - Hillsdale.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 8.

Midland - Coldwater - Orr Lake.
Tonight..Clear. Fog patches developing overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Low 8.

Orillia - Lagoon City - Washago.
Tonight..Clear. Fog patches developing overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Low 8.

Cobourg - Colborne - Western Northumberland County.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 21. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Belleville - Quinte West - Eastern Northumberland County.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Picton - Sandbanks Park.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Napanee - Consecon.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Kingston - Odessa - Frontenac Islands.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Wind southwest 20 km/h becoming light early this evening.
 Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Low 9.

Lindsay - Southern Kawartha Lakes.
Tonight..Clear. Fog patches developing overnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. 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 overnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 7.

Peterborough City - Lakefield - Southern Peterborough County.
Tonight..Clear. Fog patches developing overnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 7.

Apsley - Woodview - Northern Peterborough County.
Tonight..Clear. Fog patches developing overnight. Low plus 3 with
 risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 7.

Stirling - Tweed - Madoc.
Tonight..Clear. Fog patches developing overnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 8.

Tamworth - Sydenham - South Frontenac.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 8.

Kaladar - Bannockburn - Bon Echo Park.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 3 with risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low plus 5.

Bancroft - Hastings Highlands - Denbigh.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 2 with risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low plus 5.

Gananoque - Mallorytown.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 7.

Brockville - Prescott.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 7.

Westport - Charleston Lake.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 5.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 7.

Merrickville-Wolford - Kemptville.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 7.

Ottawa North - Kanata - Orl�ans.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 7.

Ottawa South - Richmond - Metcalfe.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 7.

Gatineau.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 5.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 7.

Prescott and Russell.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing overnight. Low plus 5.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 7.

Morrisburg - Long Sault.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 9.

Cornwall - Lancaster.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 9.

Winchester - Newington.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 5.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 9.

Maxville - Alexandria.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 5.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 6.

Plevna - Sharbot Lake - Western Lanark County.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing overnight. Low plus 3 with risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 9.

Smiths Falls - Perth - Eastern Lanark County.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing overnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Low 9.

Port Carling - Port Severn.
Tonight..Clear. Fog patches developing overnight. Low 6.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Low 10.

Bracebridge - Gravenhurst.
Tonight..Clear. Fog patches developing overnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Low 8.

Town of Parry Sound - Rosseau - Killbear Park.
Tonight..Clear. Fog patches developing overnight. Low 7.
Tuesday..Sunny. Fog patches dissipating in the morning. Wind becoming
 southwest 20 km/h late in the morning. High 21. UV index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 10.

Huntsville - Baysville.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 3 with risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 8.

Haliburton - Minden - Southern Haliburton County.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 3 with risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 6.

Oxtongue Lake - Fort Irwin - Northern Haliburton County.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 2 with risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 21. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 6.

Barry's Bay - Killaloe.
Tonight..Clearing. Fog patches developing overnight. Low plus 2 with
 risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 7.

Renfrew - Arnprior - Calabogie.
Tonight..Partly cloudy. Clearing this evening. Fog patches developing
 overnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 8.

Petawawa - Pembroke - Cobden.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing overnight. Low plus 3 with risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 23. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 8.

Western Algonquin Park - Lake of Two Rivers.
Tonight..Clearing. Fog patches developing overnight. Low plus 2 with
 risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 21. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 6.

Deep River - Whitney - Eastern Algonquin Park.
Tonight..Clearing. Fog patches developing overnight. Low plus 2 with
 risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 22. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 6.

Bayfield Inlet - Dunchurch.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 4.
Tuesday..Sunny. Fog patches dissipating in the morning. High 21. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 10.

South River - Burk's Falls.
Tonight..Clearing early this evening. Fog patches developing
 overnight. Low plus 3 with risk of frost.
Tuesday..Sunny. Fog patches dissipating in the morning. High 21. UV
 index 6 or high.
Tuesday night..Clear. Fog patches developing overnight. Low 8.

End
$$$$^^

--- up 1 week, 2 hours, 49 minutes
 * Origin: Northern Realms (618:400/23)