Subj : Southern Ontario Weather
To   : All
From : Northern Realms
Date : Mon Jul 21 2025 15:35:00

FPCN11 CWTO 211930
Forecasts for Southern Ontario and the National Capital Region issued
by Environment Canada at 3:30 p.m. EDT Monday 21 July 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..Clear. Low 15.
Tuesday..Sunny. High 25. Humidex 26. UV index 9 or very high.
Tuesday night..Clear. Low 16.

Windsor - Leamington - Essex County.
Tonight..Clear. Low 11.
Tuesday..Sunny. High 26. Humidex 29. UV index 10 or very high.
Tuesday night..Clear. Low 14.

Chatham-Kent - Rondeau Park.
Tonight..Clear. Low 11.
Tuesday..Sunny. High 26. Humidex 29. UV index 9 or very high.
Tuesday night..Clear. Low 14.

Sarnia - Petrolia - Western Lambton County.
Tonight..Clear. Wind north 20 km/h becoming light this evening.
 Low 12.
Tuesday..Sunny. High 27. Humidex 33. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Watford - Pinery Park - Eastern Lambton County.
Tonight..Clear. Wind north 20 km/h becoming light this evening.
 Low 12.
Tuesday..Sunny. High 27. Humidex 33. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Rodney - Shedden - Western Elgin County.
Tonight..Clear. Low 14.
Tuesday..Sunny. High 26. Humidex 29. UV index 9 or very high.
Tuesday night..Clear. Low 13.

St. Thomas - Aylmer - Eastern Elgin County.
Tonight..Clear. Low 14.
Tuesday..Sunny. High 26. Humidex 29. UV index 9 or very high.
Tuesday night..Clear. Low 13.

Strathroy - Komoka - Western Middlesex County.
Tonight..Clear. Low 13.
Tuesday..Sunny. High 27. Humidex 30. UV index 9 or very high.
Tuesday night..Clear. Low 12.

London - Parkhill - Eastern Middlesex County.
Tonight..Clear. Low 13.
Tuesday..Sunny. High 27. Humidex 30. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Simcoe - Delhi - Norfolk.
Tonight..Clear. Low 12.
Tuesday..Sunny. High 26. Humidex 28. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Dunnville - Caledonia - Haldimand.
Tonight..Clear. Low 12.
Tuesday..Sunny. High 26. Humidex 29. UV index 9 or very high.
Tuesday night..Clear. Low 13.

Woodstock - Tillsonburg - Oxford County.
Tonight..Clear. Low 12.
Tuesday..Sunny. High 27. Humidex 29. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Brantford - County of Brant.
Tonight..Clear. Low 12.
Tuesday..Sunny. High 27. Humidex 29. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Niagara Falls - Welland - Southern Niagara Region.
Tonight..Clear. Low 16.
Tuesday..Sunny. High 25. Humidex 28. UV index 9 or very high.
Tuesday night..Clear. Low 21.

St. Catharines - Grimsby - Northern Niagara Region.
Tonight..Clear. Low 13.
Tuesday..Sunny. High 25. Humidex 28. UV index 9 or very high.
Tuesday night..Clear. Low 15.

City of Hamilton.
Tonight..Clear. Low 12.
Tuesday..Sunny. High 25. Humidex 28. UV index 9 or very high.
Tuesday night..Clear. Fog patches developing before morning. Low 14.

Burlington - Oakville.
Tonight..Clear. Low 12.
Tuesday..Sunny. High 25. Humidex 27. UV index 9 or very high.
Tuesday night..Clear. Fog patches developing before morning. Low 15.

Halton Hills - Milton.
Tonight..Clear. Low 12.
Tuesday..Sunny. High 25. Humidex 27. UV index 9 or very high.
Tuesday night..Clear. Fog patches developing before morning. Low 15.

Mississauga - Brampton.
Tonight..Clear. Low 12.
Tuesday..Sunny. High 25. Humidex 27. UV index 9 or very high.
Tuesday night..Clear. Fog patches developing before morning. Low 15.

Caledon.
Tonight..Clear. Low 12.
Tuesday..Sunny. High 25. Humidex 27. UV index 9 or very high.
Tuesday night..Clear. Fog patches developing before morning. Low 15.

Vaughan - Richmond Hill - Markham.
Tonight..Clear. Low 11.
Tuesday..Sunny. High 25. Humidex 27. UV index 9 or very high.
Tuesday night..Clear. Low 15.

Newmarket - Georgina - Northern York Region.
Tonight..Clear. Low 11.
Tuesday..Sunny. High 25. Humidex 27. UV index 9 or very high.
Tuesday night..Clear. Low 15.

Pickering - Oshawa - Southern Durham Region.
Tonight..Clear. Low 12.
Tuesday..Sunny. High 24. Humidex 26. UV index 9 or very high.
Tuesday night..Clear. Low 14.

Uxbridge - Beaverton - Northern Durham Region.
Tonight..Clear. Low 12.
Tuesday..Sunny. High 24. Humidex 26. UV index 9 or very high.
Tuesday night..Clear. Low 14.

Goderich - Bluewater - Southern Huron County.
Tonight..Clear. Low 8.
Tuesday..Sunny. High 26. Humidex 29. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Wingham - Blyth - Northern Huron County.
Tonight..Clear. Low 8.
Tuesday..Sunny. High 26. Humidex 29. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Stratford - Mitchell - Southern Perth County.
Tonight..Clear. Low 8.
Tuesday..Sunny. High 26. Humidex 29. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Listowel - Milverton - Northern Perth County.
Tonight..Clear. Low 8.
Tuesday..Sunny. High 26. Humidex 29. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Kitchener - Cambridge - Region of Waterloo.
Tonight..Clear. Low 10.
Tuesday..Sunny. High 26. Humidex 28. UV index 9 or very high.
Tuesday night..Clear. Fog patches developing before morning. Low 12.

Guelph - Erin - Southern Wellington County.
Tonight..Clear. Low 10.
Tuesday..Sunny. High 26. Humidex 28. UV index 9 or very high.
Tuesday night..Clear. Fog patches developing before morning. Low 12.

Mount Forest - Arthur - Northern Wellington County.
Tonight..Clear. Low 10.
Tuesday..Sunny. High 26. Humidex 28. UV index 9 or very high.
Tuesday night..Clear. Fog patches developing before morning. Low 12.

Orangeville - Grand Valley - Southern Dufferin County.
Tonight..Clear. Low 8.
Tuesday..Sunny. High 26. Humidex 29. UV index 9 or very high.
Tuesday night..Clear. Low 11.

Shelburne - Mansfield - Northern Dufferin County.
Tonight..Clear. Low 8.
Tuesday..Sunny. High 26. Humidex 29. UV index 9 or very high.
Tuesday night..Clear. Low 11.

Innisfil - New Tecumseth - Angus.
Tonight..Clear. Low 8.
Tuesday..Sunny. High 26. Humidex 29. UV index 9 or very high.
Tuesday night..Clear. Low 11.

Saugeen Shores - Kincardine - Southern Bruce County.
Tonight..Clear. Low 11.
Tuesday..Sunny. High 23. Humidex 25. UV index 9 or very high.
Tuesday night..Clear. Low 16.

Bruce Peninsula - Sauble Beach - Tobermory.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing before morning. Low 14.
Tuesday..Sunny. Fog patches dissipating early in the morning.
 High 24. Humidex 27. UV index 9 or very high.
Tuesday night..Clear. Low 16 with temperature rising to 20 by
 morning.

Hanover - Dundalk - Southern Grey County.
Tonight..Clear. Low 9.
Tuesday..Sunny. High 26. UV index 9 or very high.
Tuesday night..Clear. Low 15.

Owen Sound - Blue Mountains - Northern Grey County.
Tonight..Clear. Low 9.
Tuesday..Sunny. High 26. UV index 9 or very high.
Tuesday night..Clear. Low 15.

Barrie - Collingwood - Hillsdale.
Tonight..Clear. Low 11.
Tuesday..Sunny. High 25. Humidex 28. UV index 9 or very high.
Tuesday night..Clear. Low 13.

Midland - Coldwater - Orr Lake.
Tonight..Clear. Low 15.
Tuesday..Sunny. High 25. Humidex 27. UV index 9 or very high.
Tuesday night..Clear. Low 18.

Orillia - Lagoon City - Washago.
Tonight..Clear. Low 15.
Tuesday..Sunny. High 25. Humidex 27. UV index 8 or very high.
Tuesday night..Clear. Low 18.

Cobourg - Colborne - Western Northumberland County.
Tonight..Clear. Low 13.
Tuesday..Sunny. High 24. Humidex 26. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Belleville - Quinte West - Eastern Northumberland County.
Tonight..Clear. Low 13.
Tuesday..Sunny. High 24. Humidex 26. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Picton - Sandbanks Park.
Tonight..Clear. Low 13.
Tuesday..Sunny. High 24. Humidex 26. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Napanee - Consecon.
Tonight..Clear. Low 13.
Tuesday..Sunny. High 24. Humidex 26. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Kingston - Odessa - Frontenac Islands.
Tonight..Clear. Low 13.
Tuesday..Sunny. High 24. Humidex 26. UV index 9 or very high.
Tuesday night..Clear. Low 12.

Lindsay - Southern Kawartha Lakes.
Tonight..Clear. Low 10.
Tuesday..Sunny. High 25. Humidex 28. UV index 9 or very high.
Tuesday night..Clear. Low 10.

Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes.
Tonight..Clear. Low 10.
Tuesday..Sunny. High 25. Humidex 28. UV index 9 or very high.
Tuesday night..Clear. Low 10.

Peterborough City - Lakefield - Southern Peterborough County.
Tonight..Clear. Low 10.
Tuesday..Sunny. High 25. Humidex 28. UV index 9 or very high.
Tuesday night..Clear. Low 10.

Apsley - Woodview - Northern Peterborough County.
Tonight..Clear. Low 10.
Tuesday..Sunny. High 25. Humidex 28. UV index 9 or very high.
Tuesday night..Clear. Low 10.

Stirling - Tweed - Madoc.
Tonight..Partly cloudy. Becoming clear this evening. Low 11.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 Humidex 27. UV index 9 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 11.

Tamworth - Sydenham - South Frontenac.
Tonight..Partly cloudy. Becoming clear this evening. Low 11.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 Humidex 27. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 11.

Kaladar - Bannockburn - Bon Echo Park.
Tonight..Partly cloudy. Becoming clear this evening. Low 7.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 Humidex 27. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 9.

Bancroft - Hastings Highlands - Denbigh.
Tonight..Partly cloudy. Becoming clear this evening. Low 7.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 Humidex 27. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 9.

Gananoque - Mallorytown.
Tonight..Partly cloudy. Becoming clear this evening. Low 11.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 Humidex 26. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 12.

Brockville - Prescott.
Tonight..Partly cloudy. Becoming clear this evening. Low 11.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 Humidex 26. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 12.

Westport - Charleston Lake.
Tonight..Partly cloudy. Becoming clear this evening. Low 11.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 Humidex 26. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 12.

Merrickville-Wolford - Kemptville.
Tonight..Partly cloudy. Becoming clear this evening. Low 11.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 Humidex 26. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 12.

Ottawa North - Kanata - Orl‚ans.
Tonight..Partly cloudy. Becoming clear this evening. Low 10.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 24.
 Humidex 25. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 11.

Ottawa South - Richmond - Metcalfe.
Tonight..Partly cloudy. Becoming clear this evening. Low 10.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 24.
 Humidex 25. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 11.

Gatineau.
Tonight..Partly cloudy. Becoming clear this evening. Low 11.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 Humidex 27. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 12.

Prescott and Russell.
Tonight..Partly cloudy. Becoming clear this evening. Low 10.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 24.
 Humidex 26. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 11.

Morrisburg - Long Sault.
Tonight..Partly cloudy. Becoming clear this evening. Low 9.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 24.
 Humidex 25. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 11.

Cornwall - Lancaster.
Tonight..Partly cloudy. Becoming clear this evening. Low 9.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 24.
 Humidex 25. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 11.

Winchester - Newington.
Tonight..Partly cloudy. Becoming clear this evening. Low 9.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 24.
 Humidex 25. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 11.

Maxville - Alexandria.
Tonight..Partly cloudy. Becoming clear this evening. Low 9.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 24.
 Humidex 25. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 11.

Plevna - Sharbot Lake - Western Lanark County.
Tonight..Partly cloudy. Becoming clear this evening. Low 9.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 Humidex 26. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 11.

Smiths Falls - Perth - Eastern Lanark County.
Tonight..Partly cloudy. Becoming clear this evening. Low 9.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 Humidex 26. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 11.

Port Carling - Port Severn.
Tonight..Partly cloudy. Becoming clear this evening. Low 13.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 Humidex 27. UV index 9 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 17.

Bracebridge - Gravenhurst.
Tonight..Partly cloudy. Becoming clear this evening. Low 9.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 UV index 9 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 12.

Town of Parry Sound - Rosseau - Killbear Park.
Tonight..Partly cloudy. Becoming clear this evening. Low 9.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 UV index 9 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 12.

Huntsville - Baysville.
Tonight..Partly cloudy. Becoming clear this evening. Low 9.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 25.
 UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 12.

Haliburton - Minden - Southern Haliburton County.
Tonight..Partly cloudy. Becoming clear this evening. Low 8.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 24.
 Humidex 26. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 11.

Oxtongue Lake - Fort Irwin - Northern Haliburton County.
Tonight..Partly cloudy. Becoming clear this evening. Low 8.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 24.
 Humidex 26. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 11.

Barry's Bay - Killaloe.
Tonight..Partly cloudy. Becoming clear this evening. Low 9.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 24.
 Humidex 26. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 12.

Renfrew - Arnprior - Calabogie.
Tonight..Partly cloudy. Becoming clear this evening. Low 9.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 24.
 Humidex 26. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 12.

Petawawa - Pembroke - Cobden.
Tonight..Partly cloudy. Becoming clear this evening. Low 9.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. High 24.
 Humidex 26. UV index 8 or very high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 12.

Western Algonquin Park - Lake of Two Rivers.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing before morning. Low 6.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. Fog
 patches dissipating in the morning. High 24. UV index 8 or very
 high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 9.

Deep River - Whitney - Eastern Algonquin Park.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing before morning. Low 6.
Tuesday..Sunny. Becoming a mix of sun and cloud near noon. Fog
 patches dissipating in the morning. High 24. UV index 8 or very
 high.
Tuesday night..Partly cloudy. Becoming clear in the evening. Low 9.

Bayfield Inlet - Dunchurch.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing before morning. Low 10.
Tuesday..Sunny. Fog patches dissipating early in the morning.
 High 24. Humidex 26. UV index 8 or very high.
Tuesday night..Clear. Low 14.

South River - Burk's Falls.
Tonight..Partly cloudy. Becoming clear this evening. Fog patches
 developing before morning. Low 10.
Tuesday..Sunny. Fog patches dissipating early in the morning.
 High 24. Humidex 26. UV index 8 or very high.
Tuesday night..Clear. Low 14.

End
$$$$^^

--- up 3 days, 10 hours, 37 minutes
 * Origin: Northern Realms (1:229/664)

.