FPCN11 CWTO 171930
Forecasts for Southern Ontario and the National Capital Region issued
by Environment Canada at 3:30 p.m. EDT Thursday 17 July 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..Clear. Wind northwest 30 km/h becoming light early this
 evening. Low 14.
Friday..Sunny. High 24. UV index 9 or very high.
Friday night..Clear. Low 15.

Windsor - Essex - Chatham-Kent.
Tonight..Partly cloudy. 30 percent chance of showers early this
 evening. Low 14.
Friday..A mix of sun and cloud. Becoming sunny in the morning.
 High 26. Humidex 31. UV index 10 or very high.
Friday night..Clear. Low 14.

Sarnia - Petrolia - Western Lambton County.
Tonight..Cloudy. 30 percent chance of showers early this evening.
 Clearing near midnight. Wind northwest 20 km/h becoming light late
 this evening. Low 17.
Friday..Sunny. High 25. Humidex 29. UV index 9 or very high.
Friday night..Clear. Low 15.

Watford - Pinery Park - Eastern Lambton County.
Tonight..Partly cloudy. 30 percent chance of showers early this
 evening. Clearing before morning. Wind north 20 km/h becoming light
 late this evening. Low 12.
Friday..Sunny. High 26. Humidex 30. UV index 9 or very high.
Friday night..Clear. Low 13.

Elgin.
Tonight..Partly cloudy with 30 percent chance of showers early this
 evening. Otherwise clear. Wind north 20 km/h becoming light late
 this evening. Low 13.
Friday..Sunny. High 25. Humidex 28. UV index 9 or very high.
Friday night..Clear. Low 13.

London - Middlesex.
Tonight..Partly cloudy. 30 percent chance of showers early this
 evening. Clearing before morning. Low 12.
Friday..Sunny. High 26. Humidex 29. UV index 9 or very high.
Friday night..Clear. Low 13.

Simcoe - Delhi - Norfolk.
Tonight..Partly cloudy. 30 percent chance of showers early this
 evening. Wind northwest 20 km/h becoming light early this evening.
 Low 12.
Friday..Sunny. High 26. Humidex 29. UV index 9 or very high.
Friday night..Clear. Low 11.

Dunnville - Caledonia - Haldimand.
Tonight..Clear. Wind west 30 km/h becoming light early this evening.
 Low 14.
Friday..Sunny. High 25. Humidex 28. UV index 9 or very high.
Friday night..Clear. Low 12.

Oxford - Brant.
Tonight..Partly cloudy. Becoming clear this evening. Wind northwest
 20 km/h becoming light this evening. Low 12.
Friday..Sunny. High 25. Humidex 28. UV index 9 or very high.
Friday night..Clear. Low 11.

Niagara.
Tonight..Clearing early this evening. Wind west 40 km/h gusting to 60
 becoming light this evening. Low 17.
Friday..A mix of sun and cloud. Becoming sunny in the morning.
 High 25. Humidex 28. UV index 9 or very high.
Friday night..Clear. Low 16.

City of Hamilton.
Tonight..Clear. Wind west 30 km/h becoming light early this evening.
 Low 14.
Friday..Sunny. High 24. Humidex 26. UV index 9 or very high.
Friday night..Clear. Low 13.

Burlington - Oakville
Halton Hills - Milton
Mississauga - Brampton.
Tonight..A few clouds. Wind northwest 30 km/h becoming light early
 this evening. Low 13.
Friday..Sunny. High 23. Humidex 25. UV index 9 or very high.
Friday night..Clear. Low 14.

Caledon.
Tonight..Partly cloudy. Clearing after midnight. Low 12.
Friday..Sunny. High 23. Humidex 25. UV index 9 or very high.
Friday night..Clear. Low 14.

Vaughan - Richmond Hill - Markham
Newmarket - Georgina - Northern York Region.
Tonight..Partly cloudy. Clearing this evening. Wind northwest 30 km/h
 becoming light late this evening. Low 13.
Friday..Sunny. High 25. Humidex 26. UV index 9 or very high.
Friday night..Clear. Low 13.

Pickering - Oshawa - Southern Durham Region.
Tonight..Clearing early this evening. Wind northwest 40 km/h gusting
 to 60 diminishing to 20 early this evening then becoming light late
 this evening. Low 14.
Friday..Sunny. High 23. Humidex 25. UV index 9 or very high.
Friday night..Clear. Low 13.

Uxbridge - Beaverton - Northern Durham Region.
Tonight..Mainly cloudy. Clearing after midnight. Wind northwest
 30 km/h becoming light this evening. Low 12.
Friday..Sunny. High 24. Humidex 26. UV index 9 or very high.
Friday night..Clear. Low 14.

Goderich - Bluewater - Southern Huron County
Wingham - Blyth - Northern Huron County.
Tonight..Mainly cloudy. 30 percent chance of showers early this
 evening. Clearing near midnight. Fog patches developing before
 morning. Low 9.
Friday..Sunny. Fog patches dissipating in the morning. High 25.
 Humidex 28. UV index 9 or very high.
Friday night..Clear. Low 14.

Stratford - Mitchell - Southern Perth County.
Tonight..Partly cloudy. 30 percent chance of showers early this
 evening. Clearing near midnight. Fog patches developing before
 morning. Wind northwest 20 km/h becoming light this evening. Low 11.
Friday..Sunny. Fog patches dissipating in the morning. High 24.
 Humidex 26. UV index 9 or very high.
Friday night..Clear. Low 13.

Listowel - Milverton - Northern Perth County.
Tonight..Cloudy with 30 percent chance of showers early this evening.
 Clearing this evening. Fog patches developing before morning.
 Low 10.
Friday..Sunny. Fog patches dissipating in the morning. High 24. UV
 index 9 or very high.
Friday night..Clear. Low 14.

Kitchener - Cambridge - Region of Waterloo
Guelph - Erin - Southern Wellington County.
Tonight..Clearing early this evening. Fog patches developing before
 morning. Wind northwest 30 km/h becoming light late this evening.
 Low 13.
Friday..Sunny. Fog patches dissipating early in the morning. High 23.
 UV index 9 or very high.
Friday night..Clear. Low 10.

Mount Forest - Arthur - Northern Wellington County.
Tonight..Cloudy. Clearing this evening. Fog patches developing before
 morning. Wind northwest 20 km/h becoming light early this evening.
 Low 10.
Friday..Sunny. Fog patches dissipating early in the morning. High 23.
 Humidex 25. UV index 9 or very high.
Friday night..Clear. Becoming partly cloudy after midnight. Low 14.

Dufferin - Innisfil.
Tonight..Partly cloudy. Clearing after midnight. Fog patches
 developing before morning. Low 8.
Friday..Sunny. Fog patches dissipating early in the morning. High 24.
 Humidex 26. UV index 9 or very high.
Friday night..Clear. Becoming partly cloudy after midnight. Low 10.

Saugeen Shores - Kincardine - Southern Bruce County.
Tonight..Mainly cloudy with 30 percent chance of showers early this
 evening. Clearing near midnight. Fog patches developing before
 morning. Wind northwest 20 km/h becoming light this evening. Low 12.
Friday..Sunny. Fog patches dissipating early in the morning. High 24.
 UV index 8 or very high.
Friday night..Clear. Increasing cloudiness before morning. Low 15.

Bruce Peninsula - Sauble Beach - Tobermory.
Tonight..Cloudy with 30 percent chance of showers early this evening.
 Clearing this evening. Fog patches developing before morning.
 Low 13.
Friday..Sunny. Fog patches dissipating early in the morning. High 22.
 UV index 8 or very high.
Friday night..Clear. Increasing cloudiness after midnight. Low 15.

Hanover - Dundalk - Southern Grey County.
Tonight..Cloudy with 30 percent chance of showers early this evening.
 Clearing near midnight. Fog patches developing before morning.
 Low 9.
Friday..Sunny. Fog patches dissipating early in the morning. High 24.
 Humidex 25. UV index 8 or very high.
Friday night..Clear. Becoming partly cloudy near midnight. Low 14.

Owen Sound - Blue Mountains - Northern Grey County.
Tonight..Mainly cloudy with 30 percent chance of showers early this
 evening. Clearing near midnight. Fog patches developing before
 morning. Low 11.
Friday..Sunny. Fog patches dissipating early in the morning. High 22.
 Humidex 25. UV index 8 or very high.
Friday night..Clear. Increasing cloudiness after midnight. Low 14.

Barrie - Collingwood - Hillsdale.
Tonight..Cloudy. Clearing late this evening. Fog patches developing
 before morning. Wind west 30 km/h becoming light this evening.
 Low 10.
Friday..Sunny. Fog patches dissipating early in the morning. High 24.
 UV index 9 or very high.
Friday night..Clear. Becoming partly cloudy after midnight. Low 13.

Midland - Coldwater - Orr Lake.
Tonight..Cloudy. Clearing late this evening. Fog patches developing
 before morning. Wind northwest 20 km/h becoming light this evening.
 Low 14.
Friday..Sunny. Fog patches dissipating early in the morning. High 22.
 Humidex 25. UV index 8 or very high.
Friday night..Clear. Increasing cloudiness before morning. Low 17.

Orillia - Lagoon City - Washago.
Tonight..Cloudy. Clearing late this evening. Fog patches developing
 before morning. Wind west 30 km/h becoming light this evening.
 Low 14.
Friday..Sunny. Fog patches dissipating early in the morning. High 23.
 UV index 8 or very high.
Friday night..Clear. Becoming partly cloudy after midnight. Low 17.

Belleville - Quinte - Northumberland.
Tonight..Partly cloudy with 40 percent chance of showers early this
 evening and risk of a thunderstorm. Clearing this evening. Wind
 southwest 30 km/h becoming light this evening. Low 14.
Friday..Sunny. High 24. Humidex 26. UV index 9 or very high.
Friday night..Clear. Low 12.

Kingston - Prince Edward.
Tonight..Cloudy. 40 percent chance of showers early this evening with
 risk of a thunderstorm. Clearing this evening. Wind southwest
 30 km/h becoming light this evening. Low 13.
Friday..Sunny. High 24. Humidex 26. UV index 9 or very high.
Friday night..Clear. Low 12.

Lindsay - Southern Kawartha Lakes
Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes.
Tonight..Cloudy. 30 percent chance of showers early this evening with
 risk of a thunderstorm. Clearing after midnight. Wind northwest
 30 km/h becoming light early this evening. Low 11.
Friday..Sunny. High 25. UV index 9 or very high.
Friday night..Clear. Low 12.

Peterborough City - Lakefield - Southern Peterborough County.
Tonight..Partly cloudy. 40 percent chance of showers early this
 evening with risk of a thunderstorm. Clearing before morning. Wind
 west 40 km/h gusting to 60 becoming northwest 20 early this evening
 then light late this evening. Low 12.
Friday..Sunny. High 25. Humidex 26. UV index 9 or very high.
Friday night..Clear. Low 10.

Apsley - Woodview - Northern Peterborough County.
Tonight..Cloudy. 30 percent chance of showers early this evening with
 risk of a thunderstorm. Clearing after midnight. Low 9.
Friday..Sunny. High 24. Humidex 26. UV index 8 or very high.
Friday night..Clear. Becoming partly cloudy near midnight. Low 11.

Stirling - Tweed - Madoc.
Tonight..Mainly cloudy. 40 percent chance of showers early this
 evening with risk of a thunderstorm. Clearing before morning. Wind
 west 20 km/h becoming light early this evening. Low 12.
Friday..Sunny. High 25. Humidex 26. UV index 8 or very high.
Friday night..Clear. Low 12.

Tamworth - Sydenham - South Frontenac.
Tonight..Mainly cloudy. 40 percent chance of showers early this
 evening with risk of a thunderstorm. Clearing before morning. Wind
 southwest 20 km/h becoming light early this evening. Low 12.
Friday..Sunny. High 24. Humidex 26. UV index 9 or very high.
Friday night..A few clouds. Low 12.

Kaladar - Bannockburn - Bon Echo Park.
Tonight..Cloudy with 30 percent chance of showers early this evening
 and risk of a thunderstorm. Clearing this evening. Low 10.
Friday..Sunny. High 25. UV index 8 or very high.
Friday night..Clear. Low 11.

Bancroft - Hastings Highlands - Denbigh.
Tonight..Cloudy with 40 percent chance of showers early this evening.
 Clearing near midnight. Risk of a thunderstorm early this evening.
 Low 8.
Friday..Sunny. High 23. Humidex 25. UV index 8 or very high.
Friday night..Clear. Increasing cloudiness before morning. Low 9.

Brockville - Leeds and Grenville.
Tonight..Showers ending early this evening then clearing. Risk of a
 thunderstorm early this evening. Wind southwest 20 km/h becoming
 light early this evening. Low 12.
Friday..Sunny. High 25. Humidex 26. UV index 9 or very high.
Friday night..Clear. Low 12.

City of Ottawa.
Tonight..Showers ending early this evening then clearing. Risk of a
 thunderstorm early this evening. Wind southwest 30 km/h becoming
 northwest 30 early this evening. Low 12.
Friday..Sunny. High 24. Humidex 26. UV index 8 or very high.
Friday night..Clear. Becoming partly cloudy after midnight. Low 14.

Gatineau.
Tonight..Showers ending early this evening then clearing. Risk of a
 thunderstorm early this evening. Wind southwest 30 km/h becoming
 light early this evening. Low 11.
Friday..Sunny. High 25. Humidex 27. UV index 8 or very high.
Friday night..Clear. Becoming partly cloudy after midnight. Low 13.

Prescott and Russell.
Tonight..Showers ending early this evening then mainly cloudy with
 40 percent chance of showers. Clearing before morning. Risk of a
 thunderstorm early this evening. Wind southwest 20 km/h becoming
 northwest 20 early this evening. Low 12.
Friday..Sunny. High 24. Humidex 26. UV index 8 or very high.
Friday night..Clear. Low 13.

Morrisburg - Long Sault.
Tonight..A few showers ending early this evening then cloudy with
 40 percent chance of showers. Clearing before morning. Risk of a
 thunderstorm early this evening. Wind southwest 20 km/h becoming
 northwest 20 early this evening. Low 13.
Friday..Sunny. High 24. Humidex 26. UV index 8 or very high.
Friday night..Clear. Low 12.

Cornwall - Lancaster
Winchester - Newington.
Tonight..A few showers ending early this evening then cloudy with
 40 percent chance of showers. Clearing before morning. Risk of a
 thunderstorm early this evening. Wind west 30 km/h gusting to 50
 becoming light late this evening. Low 13.
Friday..Sunny. High 24. Humidex 26. UV index 8 or very high.
Friday night..Clear. Low 12.

Maxville - Alexandria.
Tonight..A few showers ending early this evening then cloudy with
 40 percent chance of showers. Clearing before morning. Risk of a
 thunderstorm early this evening. Low 12.
Friday..Sunny. High 24. Humidex 26. UV index 8 or very high.
Friday night..Clear. Low 12.

Smiths Falls - Lanark - Sharbot Lake.
Tonight..Showers ending early this evening then clearing. Risk of a
 thunderstorm early this evening. Low 10.
Friday..Sunny. High 24. Humidex 25. UV index 8 or very high.
Friday night..Clear. Becoming partly cloudy near midnight. Low 12.

Port Carling - Port Severn.
Tonight..Cloudy. Clearing late this evening. Wind northwest 30 km/h
 becoming light early this evening. Low 14.
Friday..Sunny. High 23. Humidex 25. UV index 8 or very high.
Friday night..Clear. Increasing cloudiness before morning. Low 17.

Bracebridge - Gravenhurst.
Tonight..Cloudy. Clearing late this evening. Wind northwest 20 km/h
 becoming light this evening. Low 8.
Friday..Sunny. High 24. Humidex 25. UV index 8 or very high.
Friday night..Clear. Increasing cloudiness before morning. Low 11.

Town of Parry Sound - Rosseau - Killbear Park
Huntsville - Baysville.
Tonight..Clearing this evening. Wind north 20 km/h becoming light
 early this evening. Low 9.
Friday..Sunny. High 23. Humidex 25. UV index 8 or very high.
Friday night..Clear. Increasing cloudiness after midnight. Low 13.

Haliburton.
Tonight..Cloudy with 40 percent chance of showers early this evening.
 Clearing near midnight. Risk of a thunderstorm early this evening.
 Low 8.
Friday..Sunny. High 23. Humidex 25. UV index 8 or very high.
Friday night..Clear. Increasing cloudiness after midnight. Low 11.

Barry's Bay - Killaloe.
Tonight..Cloudy with 40 percent chance of showers early this evening.
 Clearing near midnight. Risk of a thunderstorm early this evening.
 Low 9.
Friday..Sunny. High 24. Humidex 26. UV index 8 or very high.
Friday night..Clear. Increasing cloudiness before morning. Low 12.

Renfrew - Arnprior - Calabogie.
Tonight..Cloudy with 40 percent chance of showers early this evening.
 Clearing near midnight. Risk of a thunderstorm early this evening.
 Wind northwest 20 km/h becoming light this evening. Low 11.
Friday..Sunny. High 25. Humidex 27. UV index 8 or very high.
Friday night..A few clouds. Increasing cloudiness before morning.
 Low 13.

Petawawa - Pembroke - Cobden.
Tonight..Mainly cloudy with 40 percent chance of showers early this
 evening. Clearing near midnight. Risk of a thunderstorm early this
 evening. Wind northwest 20 km/h becoming light this evening. Low 10.
Friday..Sunny. High 25. Humidex 28. UV index 8 or very high.
Friday night..Clear. Increasing cloudiness after midnight. Low 12.

Algonquin.
Tonight..Cloudy with 40 percent chance of showers early this evening.
 Clearing near midnight. Risk of a thunderstorm early this evening.
 Low 6.
Friday..Sunny. High 24. UV index 8 or very high.
Friday night..Clear. Becoming partly cloudy near midnight. Low 9.

Burk's Falls - Bayfield Inlet.
Tonight..Cloudy. Clearing this evening. Wind northwest 20 km/h
 becoming light early this evening. Low 9.
Friday..Sunny. High 23. Humidex 26. UV index 8 or very high.
Friday night..Clear. Increasing cloudiness after midnight. Low 13.

End
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 * Origin: Northern Realms (618:400/23)