Subj : Southern Ontario Weather
To   : All
From : Northern Realms
Date : Thu Sep 11 2025 15:35:00

FPCN11 CWTO 111930
Forecasts for Southern Ontario and the National Capital Region issued
by Environment Canada at 3:30 p.m. EDT Thursday 11 September 2025 for
tonight Friday and Friday night.
The next scheduled forecast will be issued at 5:00 a.m. EDT Friday.

City of Toronto.
Tonight..Partly cloudy. Fog patches developing after midnight.
 Low 13.
Friday..A mix of sun and cloud. Fog patches dissipating in the
 morning. High 23. Humidex 26. UV index 6 or high.
Friday night..Partly cloudy. Low 16.

Windsor - Leamington - Essex County.
Tonight..Clear. Fog patches developing after midnight. Low 12.
Friday..Mainly sunny. Fog patches dissipating in the morning.
 High 26. Humidex 29. UV index 7 or high.
Friday night..Clear. Low 13.

Chatham-Kent - Rondeau Park.
Tonight..Clear. Fog patches developing after midnight. Low 12.
Friday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 29. UV index 7 or high.
Friday night..Clear. Low 13.

Sarnia - Petrolia - Western Lambton County.
Tonight..Clear. Fog patches developing after midnight. Low 10.
Friday..Sunny. Fog patches dissipating in the morning. High 27.
 Humidex 30. UV index 7 or high.
Friday night..A few clouds. Low 12.

Watford - Pinery Park - Eastern Lambton County.
Tonight..A few clouds. Fog patches developing after midnight. Low 10.
Friday..Mainly sunny. Fog patches dissipating in the morning.
 High 27. Humidex 30. UV index 7 or high.
Friday night..Clear. Becoming partly cloudy after midnight. Low 12.

Rodney - Shedden - Western Elgin County.
Tonight..Clear. Fog patches developing after midnight. Low 11.
Friday..Mainly sunny. Fog patches dissipating in the morning.
 High 23. Humidex 29. UV index 7 or high.
Friday night..Clear. Becoming partly cloudy after midnight. Low 14.

St. Thomas - Aylmer - Eastern Elgin County.
Tonight..Clear. Fog patches developing after midnight. Low 11.
Friday..Mainly sunny. Fog patches dissipating in the morning.
 High 23. Humidex 29. UV index 7 or high.
Friday night..Clear. Becoming partly cloudy after midnight. Low 14.

Strathroy - Komoka - Western Middlesex County.
Tonight..Clear. Fog patches developing after midnight. Low 10.
Friday..Sunny. Fog patches dissipating in the morning. High 27.
 Humidex 29. UV index 7 or high.
Friday night..Clear. Becoming partly cloudy near midnight. Low 13.

London - Parkhill - Eastern Middlesex County.
Tonight..Clear. Fog patches developing after midnight. Low 10.
Friday..Mainly sunny. Fog patches dissipating in the morning.
 High 27. Humidex 29. UV index 7 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 13.

Simcoe - Delhi - Norfolk.
Tonight..Clear. Fog patches developing after midnight. Low 10.
Friday..Sunny. Becoming a mix of sun and cloud late in the morning.
 Fog patches dissipating in the morning. High 25. Humidex 28. UV
 index 7 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 11.

Dunnville - Caledonia - Haldimand.
Tonight..A few clouds. Fog patches developing after midnight. Low 12.
Friday..Sunny. Becoming a mix of sun and cloud late in the morning.
 Fog patches dissipating in the morning. High 25. Humidex 28. UV
 index 7 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 11.

Woodstock - Tillsonburg - Oxford County.
Tonight..Clear. Fog patches developing after midnight. Low 11.
Friday..Sunny. Becoming a mix of sun and cloud late in the morning.
 Fog patches dissipating in the morning. High 26. Humidex 28. UV
 index 7 or high.
Friday night..Clear. Becoming partly cloudy near midnight. Low 11.

Brantford - County of Brant.
Tonight..Partly cloudy. Clearing late this evening. Fog patches
 developing after midnight. Low 11.
Friday..Mainly sunny. Increasing cloudiness early in the afternoon.
 Fog patches dissipating in the morning. High 26. Humidex 28. UV
 index 7 or high.
Friday night..Partly cloudy. Low 11.

Niagara Falls - Welland - Southern Niagara Region.
Tonight..A few clouds. Fog patches developing after midnight. Low 11.
Friday..Mainly sunny. Fog patches dissipating in the morning.
 High 23. Humidex 26. UV index 7 or high.
Friday night..Clear. Becoming partly cloudy after midnight. Low 17.

St. Catharines - Grimsby - Northern Niagara Region.
Tonight..A few clouds. Fog patches developing after midnight. Low 11.
Friday..A mix of sun and cloud. Fog patches dissipating in the
 morning. High 24. Humidex 29. UV index 7 or high.
Friday night..A few clouds. Increasing cloudiness after midnight.
 Low 12.

City of Hamilton.
Tonight..Partly cloudy. Becoming clear near midnight. Fog patches
 developing after midnight. Low 12.
Friday..A mix of sun and cloud. Fog patches dissipating in the
 morning. High 23. Humidex 28. UV index 7 or high.
Friday night..A few clouds. Low 12.

Burlington - Oakville.
Tonight..Partly cloudy. Fog patches developing after midnight.
 Low 11.
Friday..A mix of sun and cloud. Fog patches dissipating in the
 morning. High 23. Humidex 26. UV index 7 or high.
Friday night..Partly cloudy. Low 13.

Halton Hills - Milton.
Tonight..Partly cloudy. Fog patches developing after midnight.
 Low 10.
Friday..A mix of sun and cloud. Fog patches dissipating in the
 morning. High 23. Humidex 26. UV index 7 or high.
Friday night..Partly cloudy. Low 13.

Mississauga - Brampton.
Tonight..Partly cloudy. Fog patches developing after midnight.
 Low 11.
Friday..A mix of sun and cloud. Fog patches dissipating in the
 morning. High 23. Humidex 26. UV index 7 or high.
Friday night..Partly cloudy. Low 13.

Caledon.
Tonight..A few clouds. Fog patches developing after midnight. Low 10.
Friday..Increasing cloudiness early in the morning. Fog patches
 dissipating in the morning. High 23. Humidex 26. UV index 6 or high.
Friday night..Partly cloudy. Low 13.

Vaughan - Richmond Hill - Markham.
Tonight..Partly cloudy. Fog patches developing after midnight. Low 9.
Friday..A mix of sun and cloud. Fog patches dissipating in the
 morning. High 23. Humidex 26. UV index 7 or high.
Friday night..Cloudy. Becoming partly cloudy in the evening. Low 13.

Newmarket - Georgina - Northern York Region.
Tonight..Partly cloudy. Fog patches developing after midnight. Low 9.
Friday..A mix of sun and cloud. Becoming cloudy in the afternoon. Fog
 patches dissipating in the morning. High 23. Humidex 26. UV index 7
 or high.
Friday night..Mainly cloudy. Low 13.

Pickering - Oshawa - Southern Durham Region.
Tonight..Partly cloudy. Fog patches developing after midnight. Low 9.
Friday..A mix of sun and cloud. Fog patches dissipating in the
 morning. High 23. Humidex 26. UV index 7 or high.
Friday night..Mainly cloudy. Low 13.

Uxbridge - Beaverton - Northern Durham Region.
Tonight..Partly cloudy. Fog patches developing after midnight. Low 9.
Friday..Mainly cloudy. Fog patches dissipating in the morning.
 High 23. Humidex 26. UV index 7 or high.
Friday night..Mainly cloudy. Low 13.

Goderich - Bluewater - Southern Huron County.
Tonight..Clear. Fog patches developing after midnight. Wind north
 20 km/h becoming light this evening. Low 9.
Friday..Sunny. Fog patches dissipating in the morning. High 26.
 Humidex 28. UV index 6 or high.
Friday night..Increasing cloudiness. Low 14.

Wingham - Blyth - Northern Huron County.
Tonight..A few clouds. Fog patches developing after midnight. Low 9.
Friday..Mainly sunny. Fog patches dissipating in the morning.
 High 26. Humidex 28. UV index 6 or high.
Friday night..Increasing cloudiness. Low 14.

Stratford - Mitchell - Southern Perth County.
Tonight..Clear. Fog patches developing after midnight. Low 9.
Friday..Mainly sunny. Fog patches dissipating in the morning.
 High 26. Humidex 28. UV index 6 or high.
Friday night..Increasing cloudiness. Low 14.

Listowel - Milverton - Northern Perth County.
Tonight..Partly cloudy. Clearing late this evening. Fog patches
 developing after midnight. Low 9.
Friday..Sunny. Becoming a mix of sun and cloud late in the morning.
 Fog patches dissipating in the morning. High 26. Humidex 28. UV
 index 6 or high.
Friday night..Increasing cloudiness. Low 14.

Kitchener - Cambridge - Region of Waterloo.
Tonight..Partly cloudy. Clearing late this evening. Fog patches
 developing after midnight. Low 10.
Friday..Sunny. Becoming a mix of sun and cloud in the morning. Fog
 patches dissipating in the morning. High 26. Humidex 28. UV index 7
 or high.
Friday night..Partly cloudy. Low 12.

Guelph - Erin - Southern Wellington County.
Tonight..Mainly cloudy. Clearing this evening. Fog patches developing
 after midnight. Low 10.
Friday..A mix of sun and cloud. Fog patches dissipating in the
 morning. High 26. Humidex 28. UV index 7 or high.
Friday night..Increasing cloudiness. Low 12.

Mount Forest - Arthur - Northern Wellington County.
Tonight..A few clouds. Fog patches developing after midnight. Low 10.
Friday..A mix of sun and cloud. Fog patches dissipating in the
 morning. High 26. Humidex 28. UV index 7 or high.
Friday night..Increasing cloudiness. Low 12.

Orangeville - Grand Valley - Southern Dufferin County.
Tonight..Partly cloudy. Fog patches developing after midnight. Low 8.
Friday..A mix of sun and cloud. Becoming cloudy late in the morning.
 Fog patches dissipating in the morning. High 24. Humidex 28. UV
 index 6 or high.
Friday night..Partly cloudy. Low 14.

Shelburne - Mansfield - Northern Dufferin County.
Tonight..Clearing early this evening. Fog patches developing after
 midnight. Low 8.
Friday..A mix of sun and cloud. Fog patches dissipating in the
 morning. High 24. Humidex 28. UV index 6 or high.
Friday night..Increasing cloudiness. Low 14.

Innisfil - New Tecumseth - Angus.
Tonight..Partly cloudy. Fog patches developing after midnight. Low 8.
Friday..Mainly cloudy. Fog patches dissipating in the morning.
 High 24. Humidex 28. UV index 6 or high.
Friday night..Increasing cloudiness. Low 14.

Saugeen Shores - Kincardine - Southern Bruce County.
Tonight..Clear. Fog patches developing after midnight. Low 9.
Friday..Mainly sunny. Fog patches dissipating in the morning.
 High 24. Humidex 27. UV index 6 or high.
Friday night..Increasing cloudiness early in the evening. Low 15.

Bruce Peninsula - Sauble Beach - Tobermory.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing after midnight. Low 9.
Friday..Sunny. Becoming a mix of sun and cloud late in the morning.
 Fog patches dissipating in the morning. High 24. Humidex 27. UV
 index 6 or high.
Friday night..Partly cloudy. Becoming cloudy in the evening. Low 15.

Hanover - Dundalk - Southern Grey County.
Tonight..A few clouds. Fog patches developing after midnight. Low 9.
Friday..Mainly sunny. Fog patches dissipating in the morning.
 High 24. Humidex 27. UV index 6 or high.
Friday night..Increasing cloudiness. Low 15.

Owen Sound - Blue Mountains - Northern Grey County.
Tonight..Clear. Fog patches developing after midnight. Low 9.
Friday..Mainly sunny. Fog patches dissipating in the morning.
 High 23. Humidex 27. UV index 6 or high.
Friday night..Increasing cloudiness early in the evening. Low 15.

Barrie - Collingwood - Hillsdale.
Tonight..Partly cloudy. Fog patches developing after midnight. Low 9.
Friday..A mix of sun and cloud. Fog patches dissipating in the
 morning. High 23. Humidex 25. UV index 6 or high.
Friday night..Increasing cloudiness. Low 12.

Midland - Coldwater - Orr Lake.
Tonight..Partly cloudy. Fog patches developing after midnight. Low 9.
Friday..Mainly sunny. Fog patches dissipating in the morning.
 High 23. Humidex 25. UV index 6 or high.
Friday night..Increasing cloudiness. Low 12.

Orillia - Lagoon City - Washago.
Tonight..Partly cloudy. Fog patches developing after midnight. Low 9.
Friday..A mix of sun and cloud. Fog patches dissipating in the
 morning. High 23. Humidex 25. UV index 6 or high.
Friday night..Increasing cloudiness. Low 12.

Cobourg - Colborne - Western Northumberland County.
Tonight..Cloudy. Becoming partly cloudy this evening. Low 9.
Friday..A mix of sun and cloud. Becoming sunny in the morning.
 High 22. Humidex 25. UV index 6 or high.
Friday night..Increasing cloudiness. Low 11.

Belleville - Quinte West - Eastern Northumberland County.
Tonight..Cloudy. Becoming partly cloudy this evening. Low 9.
Friday..A mix of sun and cloud. Becoming sunny in the morning.
 High 22. Humidex 25. UV index 6 or high.
Friday night..Increasing cloudiness. Low 11.

Picton - Sandbanks Park.
Tonight..Cloudy. Becoming partly cloudy this evening. Low 9.
Friday..A mix of sun and cloud. Becoming sunny in the morning.
 High 22. Humidex 25. UV index 6 or high.
Friday night..Increasing cloudiness. Low 11.

Napanee - Consecon.
Tonight..Cloudy. Becoming partly cloudy this evening. Low 9.
Friday..A mix of sun and cloud. Becoming sunny in the morning.
 High 22. Humidex 25. UV index 6 or high.
Friday night..Increasing cloudiness. Low 11.

Kingston - Odessa - Frontenac Islands.
Tonight..Mainly cloudy. Clearing this evening. Low 9.
Friday..Sunny. High 22. Humidex 25. UV index 6 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 11.

Lindsay - Southern Kawartha Lakes.
Tonight..Cloudy. Becoming partly cloudy this evening. Low 7.
Friday..A mix of sun and cloud. High 23. Humidex 26. UV index 6 or
 high.
Friday night..Partly cloudy. Becoming cloudy near midnight. Low 11.

Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes.
Tonight..Partly cloudy. Low 6.
Friday..Mainly sunny. High 23. Humidex 26. UV index 6 or high.
Friday night..Partly cloudy. Becoming cloudy near midnight. Low 11.

Peterborough City - Lakefield - Southern Peterborough County.
Tonight..Cloudy. Becoming partly cloudy this evening. Low 7.
Friday..A mix of sun and cloud. High 23. Humidex 26. UV index 6 or
 high.
Friday night..Mainly cloudy. Low 11.

Apsley - Woodview - Northern Peterborough County.
Tonight..Clearing early this evening. Low 6.
Friday..Sunny. High 23. Humidex 26. UV index 6 or high.
Friday night..Increasing cloudiness. Low 11.

Stirling - Tweed - Madoc.
Tonight..Clearing early this evening. Low 8.
Friday..Sunny. High 23. UV index 6 or high.
Friday night..Increasing cloudiness. Low 10.

Tamworth - Sydenham - South Frontenac.
Tonight..Clearing early this evening. Low 8.
Friday..Sunny. High 23. UV index 6 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 10.

Kaladar - Bannockburn - Bon Echo Park.
Tonight..Clearing early this evening. Low plus 3 with risk of frost.
Friday..Sunny. High 23. UV index 6 or high.
Friday night..Clear. Increasing cloudiness near midnight. Low 11.

Bancroft - Hastings Highlands - Denbigh.
Tonight..Clearing early this evening. Low plus 3 with risk of frost.
Friday..Sunny. High 23. UV index 6 or high.
Friday night..Clear. Increasing cloudiness late in the evening then
 30 percent chance of showers overnight. Low 8.

Gananoque - Mallorytown.
Tonight..Clearing early this evening. Low 7.
Friday..Sunny. High 23. UV index 6 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 9.

Brockville - Prescott.
Tonight..Clearing early this evening. Low 7.
Friday..Sunny. High 23. UV index 6 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 9.

Westport - Charleston Lake.
Tonight..Clearing early this evening. Low 7.
Friday..Sunny. High 23. UV index 6 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 9.

Merrickville-Wolford - Kemptville.
Tonight..Clearing early this evening. Low 7.
Friday..Sunny. High 23. UV index 6 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 9.

Ottawa North - Kanata - Orl‚ans.
Tonight..Clearing early this evening. Low 6.
Friday..Sunny. High 22. UV index 6 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 10.

Ottawa South - Richmond - Metcalfe.
Tonight..Clearing early this evening. Low 6.
Friday..Sunny. High 22. UV index 6 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 10.

Gatineau.
Tonight..Clearing early this evening. Wind north 20 km/h becoming
 light early this evening. Low 6.
Friday..Sunny. High 22. UV index 6 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 11.

Prescott and Russell.
Tonight..Clearing early this evening. Low 6.
Friday..Sunny. High 22. UV index 6 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 9.

Morrisburg - Long Sault.
Tonight..Clearing early this evening. Low 7.
Friday..Sunny. High 21. UV index 6 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 10.

Cornwall - Lancaster.
Tonight..Clearing early this evening. Wind north 20 km/h becoming
 light early this evening. Low 7.
Friday..Sunny. High 21. UV index 6 or high.
Friday night..Clear. Increasing cloudiness overnight. Low 10.

Winchester - Newington.
Tonight..Clearing early this evening. Low 6.
Friday..Sunny. High 21. UV index 6 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 10.

Maxville - Alexandria.
Tonight..Clearing early this evening. Low 6.
Friday..Sunny. High 20. UV index 6 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 9.

Plevna - Sharbot Lake - Western Lanark County.
Tonight..Clearing early this evening. Low plus 5.
Friday..Sunny. High 23. UV index 6 or high.
Friday night..Clear. Increasing cloudiness near midnight. Low 11.

Smiths Falls - Perth - Eastern Lanark County.
Tonight..Clearing early this evening. Low plus 5.
Friday..Sunny. High 23. UV index 6 or high.
Friday night..Clear. Increasing cloudiness after midnight. Low 11.

Port Carling - Port Severn.
Tonight..Partly cloudy. Low 9.
Friday..A mix of sun and cloud. Becoming sunny late in the morning.
 High 23. Humidex 26. UV index 6 or high.
Friday night..A few clouds. Increasing cloudiness late in the evening
 then 30 percent chance of showers overnight. Low 15.

Bracebridge - Gravenhurst.
Tonight..A few clouds. Low plus 5.
Friday..Sunny. High 23. UV index 6 or high.
Friday night..A few clouds. Increasing cloudiness late in the evening
 then 30 percent chance of showers overnight. Low 13.

Town of Parry Sound - Rosseau - Killbear Park.
Tonight..Clearing early this evening. Low 6.
Friday..Sunny. High 23. UV index 6 or high.
Friday night..Increasing cloudiness early in the evening. 30 percent
 chance of showers overnight. Low 13.

Huntsville - Baysville.
Tonight..Clearing early this evening. Low 6.
Friday..Sunny. High 23. UV index 6 or high.
Friday night..Partly cloudy. Becoming cloudy near midnight with
 30 percent chance of showers overnight. Low 13.

Haliburton - Minden - Southern Haliburton County.
Tonight..Clearing early this evening. Low plus 3 with risk of frost.
Friday..Sunny. High 21. UV index 6 or high.
Friday night..Clear. Increasing cloudiness late in the evening then
 30 percent chance of showers overnight. Low 11.

Oxtongue Lake - Fort Irwin - Northern Haliburton County.
Tonight..Clearing early this evening. Low plus 3 with risk of frost.
Friday..Sunny. High 21. UV index 6 or high.
Friday night..A few clouds. Increasing cloudiness late in the evening
 then 30 percent chance of showers overnight. Low 11.

Barry's Bay - Killaloe.
Tonight..Clear. Low plus 3 with risk of frost.
Friday..Sunny. High 22. UV index 6 or high.
Friday night..A few clouds. Increasing cloudiness late in the evening
 then 30 percent chance of showers overnight. Low 11.

Renfrew - Arnprior - Calabogie.
Tonight..Clearing early this evening. Low plus 4 with risk of frost.
Friday..Sunny. High 22. UV index 6 or high.
Friday night..A few clouds. Increasing cloudiness late in the evening
 then 30 percent chance of showers overnight. Low 11.

Petawawa - Pembroke - Cobden.
Tonight..Clearing early this evening. Low plus 4 with risk of frost.
Friday..Sunny. High 22. UV index 6 or high.
Friday night..Increasing cloudiness. 30 percent chance of showers
 overnight. Low 11.

Western Algonquin Park - Lake of Two Rivers.
Tonight..Clearing early this evening. Low plus 3 with risk of frost.
Friday..Sunny. High 21. UV index 6 or high.
Friday night..Partly cloudy. Becoming cloudy near midnight with
 30 percent chance of showers overnight. Low 10.

Deep River - Whitney - Eastern Algonquin Park.
Tonight..Clearing early this evening. Low plus 3 with risk of frost.
Friday..Sunny. High 21. UV index 6 or high.
Friday night..Partly cloudy. Becoming cloudy near midnight with
 30 percent chance of showers overnight. Low 10.

Bayfield Inlet - Dunchurch.
Tonight..Clear. Low plus 5.
Friday..Sunny. Becoming a mix of sun and cloud in the morning.
 High 22. UV index 6 or high.
Friday night..Becoming cloudy in the evening. 30 percent chance of
 showers overnight. Low 12.

South River - Burk's Falls.
Tonight..Clearing early this evening. Low plus 5.
Friday..Sunny. Becoming a mix of sun and cloud in the morning.
 High 22. UV index 6 or high.
Friday night..Becoming cloudy in the evening. 30 percent chance of
 showers overnight. Low 12.

End
$$$$^^

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

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