Subj : Southern Ontario Weather
To   : All
From : Northern Realms
Date : Fri Sep 19 2025 15:35:00

FPCN11 CWTO 191930
Forecasts for Southern Ontario and the National Capital Region issued
by Environment Canada at 3:30 p.m. EDT Friday 19 September 2025 for
tonight Saturday and Saturday night.
The next scheduled forecast will be issued at 5:00 a.m. EDT Saturday.

City of Toronto.
Tonight..Clear. Low 10.
Saturday..A mix of sun and cloud. Becoming sunny late in the morning.
 Wind becoming east 20 km/h gusting to 40 in the morning. High 19. UV
 index 6 or high.
Saturday night..Clear. Wind east 20 km/h becoming light in the
 evening. Low 11.

Windsor - Leamington - Essex County.
Tonight..Partly cloudy. Wind northeast 20 km/h becoming light late
 this evening. Low 13.
Saturday..Mainly sunny. Wind becoming east 20 km/h gusting to 40 in
 the morning. High 24. Humidex 29. UV index 6 or high.
Saturday night..Clear. Becoming partly cloudy in the evening. Wind
 east 20 km/h becoming light in the evening. Low 15.

Chatham-Kent - Rondeau Park.
Tonight..A few clouds. Wind becoming east 20 km/h before morning.
 Low 12.
Saturday..Mainly sunny. Wind east 20 km/h gusting to 40. High 22.
 Humidex 27. UV index 6 or high.
Saturday night..Clear. Wind east 20 km/h gusting to 40 becoming light
 after midnight. Low 14.

Sarnia - Petrolia - Western Lambton County.
Tonight..A few clouds. Wind north 20 km/h becoming light this
 evening. Low 11.
Saturday..A mix of sun and cloud. Wind east 20 km/h becoming light
 late in the morning. High 24. Humidex 26. UV index 6 or high.
Saturday night..Clear. Becoming partly cloudy before morning. Low 12.

Watford - Pinery Park - Eastern Lambton County.
Tonight..Clear. Low 11.
Saturday..Sunny. Wind becoming east 20 km/h gusting to 40 in the
 morning. High 24. Humidex 26. UV index 6 or high.
Saturday night..A few clouds. Wind northeast 20 km/h becoming light
 in the evening. Low 12.

Rodney - Shedden - Western Elgin County.
Tonight..Clear. Low 10.
Saturday..Sunny. Wind becoming east 20 km/h gusting to 40 in the
 morning. High 22. UV index 6 or high.
Saturday night..Clear. Wind east 20 km/h becoming light in the
 evening. Low 13.

St. Thomas - Aylmer - Eastern Elgin County.
Tonight..Clear. Low 10.
Saturday..Sunny. Wind becoming east 20 km/h gusting to 40 in the
 morning. High 22. UV index 6 or high.
Saturday night..Clear. Wind east 20 km/h becoming light near
 midnight. Low 12.

Strathroy - Komoka - Western Middlesex County.
Tonight..A few clouds. Low 10.
Saturday..Sunny. Wind becoming east 20 km/h gusting to 40 in the
 morning then light in the afternoon. High 23. UV index 6 or high.
Saturday night..Clear. Low 12.

London - Parkhill - Eastern Middlesex County.
Tonight..Clear. Low 10.
Saturday..Sunny. Wind becoming east 20 km/h gusting to 40 in the
 morning. High 23. UV index 6 or high.
Saturday night..Clear. Wind east 20 km/h becoming light near
 midnight. Low 12.

Simcoe - Delhi - Norfolk.
Tonight..Clear. Low 8.
Saturday..Sunny. Wind becoming east 20 km/h gusting to 40 in the
 morning. High 22. UV index 6 or high.
Saturday night..Clear. Wind northeast 20 km/h becoming light near
 midnight. Low 10.

Dunnville - Caledonia - Haldimand.
Tonight..Clear. Low 9.
Saturday..Sunny. Wind becoming east 20 km/h gusting to 40 in the
 morning. High 21. UV index 6 or high.
Saturday night..A few clouds. Wind northeast 20 km/h becoming light
 near midnight. Low 10.

Woodstock - Tillsonburg - Oxford County.
Tonight..Clear. Low 9.
Saturday..Sunny. Wind becoming east 20 km/h gusting to 40 in the
 morning. High 22. UV index 6 or high.
Saturday night..Clear. Wind east 20 km/h becoming light in the
 evening. Low 11.

Brantford - County of Brant.
Tonight..Clear. Low 8.
Saturday..Sunny. Wind becoming east 20 km/h gusting to 40 in the
 morning. High 21. UV index 6 or high.
Saturday night..A few clouds. Wind east 20 km/h becoming light in the
 evening. Low 10.

Niagara Falls - Welland - Southern Niagara Region.
Tonight..Clear. Low 9.
Saturday..Sunny. Wind becoming east 20 km/h gusting to 40 in the
 morning. High 22. UV index 6 or high.
Saturday night..A few clouds. Wind northeast 20 km/h becoming light
 in the evening. Low 10.

St. Catharines - Grimsby - Northern Niagara Region.
Tonight..Clear. Low 9.
Saturday..Sunny. Wind becoming northeast 20 km/h gusting to 40 in the
 morning. High 20. UV index 6 or high.
Saturday night..Clear. Wind northeast 20 km/h gusting to 40 becoming
 light in the evening. Low 10.

City of Hamilton.
Tonight..Clear. Low 9.
Saturday..Mainly sunny. Wind becoming northeast 30 km/h gusting to 50
 in the morning. High 19. UV index 6 or high.
Saturday night..A few clouds. Wind northeast 20 km/h gusting to 40
 becoming light near midnight. Low 10.

Burlington - Oakville.
Tonight..Clear. Low 10.
Saturday..A mix of sun and cloud. Clearing near noon. Wind becoming
 east 30 km/h gusting to 50 in the morning. High 19. UV index 6 or
 high.
Saturday night..Clear. Becoming partly cloudy after midnight. Wind
 east 20 km/h gusting to 40 becoming light near midnight. Low 11.

Halton Hills - Milton.
Tonight..Clear. Becoming partly cloudy after midnight. Low 8.
Saturday..A mix of sun and cloud. Clearing near noon. Wind becoming
 east 20 km/h gusting to 40 in the morning. High 19. UV index 6 or
 high.
Saturday night..Clear. Wind east 20 km/h becoming light in the
 evening. Low 10.

Mississauga - Brampton.
Tonight..Clear. Low 9.
Saturday..A mix of sun and cloud. Clearing near noon. Wind becoming
 east 20 km/h gusting to 40 in the morning. High 19. UV index 6 or
 high.
Saturday night..Clear. Wind east 20 km/h becoming light in the
 evening. Low 11.

Caledon.
Tonight..Clear. Low 7.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low 9.

Vaughan - Richmond Hill - Markham.
Tonight..Clear. Low 7.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low 9.

Newmarket - Georgina - Northern York Region.
Tonight..Clear. Low 6.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low 8.

Pickering - Oshawa - Southern Durham Region.
Tonight..Clear. Low 6.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low 8.

Uxbridge - Beaverton - Northern Durham Region.
Tonight..Clear. Low plus 4 with risk of frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low 7.

Goderich - Bluewater - Southern Huron County.
Tonight..Clear. Low 9.
Saturday..Sunny. Wind becoming east 20 km/h in the morning. High 22.
 UV index 6 or high.
Saturday night..A few clouds. Wind southeast 20 km/h. Low 12.

Wingham - Blyth - Northern Huron County.
Tonight..Clear. Low 8.
Saturday..Sunny. High 23. UV index 6 or high.
Saturday night..Clear. Wind becoming southeast 20 km/h in the
 evening. Low 11.

Stratford - Mitchell - Southern Perth County.
Tonight..Clear. Low 8.
Saturday..Sunny. Wind becoming east 20 km/h gusting to 40 in the
 morning. High 22. UV index 6 or high.
Saturday night..Clear. Wind east 20 km/h becoming light near
 midnight. Low 11.

Listowel - Milverton - Northern Perth County.
Tonight..Clear. Low 7.
Saturday..Sunny. High 22. UV index 6 or high.
Saturday night..Clear. Low 10.

Kitchener - Cambridge - Region of Waterloo.
Tonight..Clear. Low 7.
Saturday..A mix of sun and cloud. Clearing near noon. Wind becoming
 east 20 km/h gusting to 40 in the morning. High 19. UV index 6 or
 high.
Saturday night..Clear. Wind east 20 km/h becoming light in the
 evening. Low 9.

Guelph - Erin - Southern Wellington County.
Tonight..Clear. Becoming partly cloudy after midnight. Low 7.
Saturday..A mix of sun and cloud. Clearing early in the afternoon.
 Wind becoming east 20 km/h gusting to 40 in the morning. High 19. UV
 index 6 or high.
Saturday night..Clear. Wind east 20 km/h becoming light in the
 evening. Low 9.

Mount Forest - Arthur - Northern Wellington County.
Tonight..Clear. Low 7.
Saturday..Sunny. High 20. UV index 6 or high.
Saturday night..Clear. Low 10.

Orangeville - Grand Valley - Southern Dufferin County.
Tonight..Clear. Low 6.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low 8.

Shelburne - Mansfield - Northern Dufferin County.
Tonight..Clear. Low 6.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low 8.

Innisfil - New Tecumseth - Angus.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 20. UV index 6 or high.
Saturday night..Clear. Low 6.

Saugeen Shores - Kincardine - Southern Bruce County.
Tonight..Clear. Low 8.
Saturday..Sunny. High 22. UV index 6 or high.
Saturday night..A few clouds. Low 10.

Bruce Peninsula - Sauble Beach - Tobermory.
Tonight..Clear. Low 8.
Saturday..Sunny. Wind becoming east 20 km/h in the morning. High 19.
 UV index 6 or high.
Saturday night..Clear. Becoming partly cloudy after midnight. Wind
 east 20 km/h becoming light in the evening. Low 10.

Hanover - Dundalk - Southern Grey County.
Tonight..Clear. Low 7.
Saturday..Sunny. High 20. UV index 6 or high.
Saturday night..Clear. Low 9.

Owen Sound - Blue Mountains - Northern Grey County.
Tonight..Clear. Low 7.
Saturday..Sunny. High 20. UV index 6 or high.
Saturday night..Clear. Low 9.

Barrie - Collingwood - Hillsdale.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low 8.

Midland - Coldwater - Orr Lake.
Tonight..Clear. Low plus 4 with risk of frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low 8.

Orillia - Lagoon City - Washago.
Tonight..Clear. Low plus 4 with risk of frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low 7.

Cobourg - Colborne - Western Northumberland County.
Tonight..Clear. Low plus 3 with risk of frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low plus 5.

Belleville - Quinte West - Eastern Northumberland County.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 20. UV index 6 or high.
Saturday night..Clear. Low plus 4 with risk of frost.

Picton - Sandbanks Park.
Tonight..Clear. Low plus 4 with risk of frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low 6.

Napanee - Consecon.
Tonight..Clear. Low plus 4 with risk of frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low plus 5.

Kingston - Odessa - Frontenac Islands.
Tonight..Clear. Low plus 4 with risk of frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low plus 4 with risk of frost.

Lindsay - Southern Kawartha Lakes.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low plus 5.

Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low plus 4 with risk of frost.

Peterborough City - Lakefield - Southern Peterborough County.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low plus 3 with risk of frost.

Apsley - Woodview - Northern Peterborough County.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low plus 3 with risk of frost.

Stirling - Tweed - Madoc.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low plus 3 with risk of frost.

Tamworth - Sydenham - South Frontenac.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low plus 3 with risk of frost.

Kaladar - Bannockburn - Bon Echo Park.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 2 with risk of frost.

Bancroft - Hastings Highlands - Denbigh.
Tonight..Clear. Low minus 1 with frost.
Saturday..Sunny. High 17. UV index 6 or high.
Saturday night..Clear. Low plus 1 with patchy frost.

Gananoque - Mallorytown.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 3 with risk of frost.

Brockville - Prescott.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 3 with risk of frost.

Westport - Charleston Lake.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 3 with risk of frost.

Merrickville-Wolford - Kemptville.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 2 with risk of frost.

Ottawa North - Kanata - Orl‚ans.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 1 with patchy frost.

Ottawa South - Richmond - Metcalfe.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 1 with patchy frost.

Gatineau.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 1 with patchy frost.

Prescott and Russell.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 1 with patchy frost.

Morrisburg - Long Sault.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 2 with risk of frost.

Cornwall - Lancaster.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 2 with risk of frost.

Winchester - Newington.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 1 with patchy frost.

Maxville - Alexandria.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 1 with patchy frost.

Plevna - Sharbot Lake - Western Lanark County.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 2 with risk of frost.

Smiths Falls - Perth - Eastern Lanark County.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 1 with patchy frost.

Port Carling - Port Severn.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low 7.

Bracebridge - Gravenhurst.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low plus 4 with risk of frost.

Town of Parry Sound - Rosseau - Killbear Park.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 19. UV index 6 or high.
Saturday night..Clear. Low 7.

Huntsville - Baysville.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 3 with risk of frost.

Haliburton - Minden - Southern Haliburton County.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 3 with risk of frost.

Oxtongue Lake - Fort Irwin - Northern Haliburton County.
Tonight..Clear. Low minus 1 with frost.
Saturday..Sunny. High 17. UV index 6 or high.
Saturday night..Clear. Low plus 1 with patchy frost.

Barry's Bay - Killaloe.
Tonight..Clear. Low zero with frost.
Saturday..Sunny. High 17. UV index 6 or high.
Saturday night..Clear. Low plus 1 with patchy frost.

Renfrew - Arnprior - Calabogie.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 17. UV index 6 or high.
Saturday night..Clear. Low plus 1 with patchy frost.

Petawawa - Pembroke - Cobden.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 17. UV index 6 or high.
Saturday night..Clear. Low plus 1 with patchy frost.

Western Algonquin Park - Lake of Two Rivers.
Tonight..Clear. Low minus 1 with frost.
Saturday..Sunny. High 17. UV index 6 or high.
Saturday night..Clear. Low plus 1 with patchy frost.

Deep River - Whitney - Eastern Algonquin Park.
Tonight..Clear. Low minus 1 with frost.
Saturday..Sunny. High 17. UV index 6 or high.
Saturday night..Clear. Low zero with patchy frost.

Bayfield Inlet - Dunchurch.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 4 with risk of frost.

South River - Burk's Falls.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 18. UV index 6 or high.
Saturday night..Clear. Low plus 3 with risk of frost.

End
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--- up 2 days, 23 hours, 27 minutes
 * Origin: Northern Realms (618:400/23)

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