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Extended Forecasts for Southern Ontario and the National Capital Region


* NOTE: Corrected and/or amended bulletins are listed first *

 
FPCN51 CWTO 190900
Extended forecasts from Wednesday night 20 May to Monday 25 May for
Southern Ontario and the National Capital Region issued by
Environment Canada at 5:00 a.m. EDT Tuesday 19 May 2026.
The next scheduled forecast will be issued at 11:00 a.m. EDT.

City of Toronto.
Wednesday night..Clear. Low 6.
Thursday..Sunny. High 16.
Thursday night..Cloudy. Low 9.
Friday..Cloudy. High 15.
Friday night..Cloudy with 40 percent chance of showers. Low 10.
Saturday..Cloudy with 40 percent chance of showers. High 13.
Saturday night..Cloudy with 40 percent chance of showers. Low 11.
Sunday..Cloudy with 40 percent chance of showers. High 20.
Sunday night..Cloudy periods. Low 12.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 10. High 20.

Windsor - Essex - Chatham-Kent.
Wednesday night..Clear. Low plus 3.
Thursday..Sunny. High 17.
Thursday night..Clear. Low 9.
Friday..Cloudy with 60 percent chance of showers. High 18.
Friday night..Cloudy with 60 percent chance of showers. Low 12.
Saturday..Cloudy with 40 percent chance of showers. High 18.
Saturday night..Cloudy. Low 13.
Sunday..A mix of sun and cloud. High 23.
Sunday night..Cloudy periods. Low 14.
Monday..Cloudy with 60 percent chance of showers. High 24.
Normals for the period..Low 10. High 22.

Sarnia - Lambton.
Wednesday night..Clear. Low plus 1.
Thursday..Sunny. High 17.
Thursday night..Cloudy periods. Low 8.
Friday..Cloudy with 40 percent chance of showers. High 18.
Friday night..Cloudy with 60 percent chance of showers. Low 12.
Saturday..Cloudy with 40 percent chance of showers. High 16.
Saturday night..Cloudy. Low 12.
Sunday..A mix of sun and cloud. High 20.
Sunday night..Cloudy periods. Low 13.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 9. High 21.

Elgin.
Wednesday night..Clear. Low plus 3.
Thursday..Sunny. High 17.
Thursday night..Cloudy periods. Low 9.
Friday..Cloudy with 60 percent chance of showers. High 17.
Friday night..Cloudy with 60 percent chance of showers. Low 12.
Saturday..Cloudy with 40 percent chance of showers. High 16.
Saturday night..Cloudy. Low 12.
Sunday..Cloudy. High 21.
Sunday night..Cloudy periods. Low 13.
Monday..A mix of sun and cloud. High 24.
Normals for the period..Low 9. High 20.

London - Middlesex.
Wednesday night..Clear. Low plus 1.
Thursday..Sunny. High 17.
Thursday night..Cloudy periods. Low 9.
Friday..Cloudy with 40 percent chance of showers. High 18.
Friday night..Cloudy with 60 percent chance of showers. Low 11.
Saturday..Cloudy with 40 percent chance of showers. High 16.
Saturday night..Cloudy. Low 12.
Sunday..Cloudy. High 21.
Sunday night..Cloudy periods. Low 13.
Monday..A mix of sun and cloud. High 24.
Normals for the period..Low 9. High 21.

Simcoe - Delhi - Norfolk.
Wednesday night..Clear. Low plus 3.
Thursday..Sunny. High 17.
Thursday night..Cloudy periods. Low 6.
Friday..Cloudy. High 18.
Friday night..Cloudy with 60 percent chance of showers. Low 11.
Saturday..Cloudy with 40 percent chance of showers. High 15.
Saturday night..Cloudy with 40 percent chance of showers. Low 12.
Sunday..Cloudy with 40 percent chance of showers. High 21.
Sunday night..Cloudy periods. Low 13.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 8. High 21.

Dunnville - Caledonia - Haldimand.
Wednesday night..Clear. Low plus 5.
Thursday..Sunny. High 14.
Thursday night..Cloudy periods. Low 8.
Friday..Cloudy. High 18.
Friday night..Cloudy with 60 percent chance of showers. Low 11.
Saturday..Cloudy with 40 percent chance of showers. High 14.
Saturday night..Cloudy with 40 percent chance of showers. Low 12.
Sunday..Cloudy with 40 percent chance of showers. High 20.
Sunday night..Cloudy periods. Low 13.
Monday..A mix of sun and cloud. High 22.
Normals for the period..Low 9. High 20.

Oxford - Brant.
Wednesday night..Clear. Low plus 2.
Thursday..Sunny. High 16.
Thursday night..Cloudy periods. Low 8.
Friday..Cloudy with 40 percent chance of showers. High 17.
Friday night..Cloudy with 60 percent chance of showers. Low 11.
Saturday..Cloudy with 40 percent chance of showers. High 15.
Saturday night..Cloudy. Low 11.
Sunday..Cloudy. High 21.
Sunday night..Cloudy periods. Low 12.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 9. High 21.

Niagara.
Wednesday night..Clear. Low 6.
Thursday..Sunny. High 14.
Thursday night..Increasing cloudiness. Low 9.
Friday..Cloudy. High 19.
Friday night..Cloudy with 60 percent chance of showers. Low 11.
Saturday..Cloudy with 40 percent chance of showers. High 13.
Saturday night..Cloudy with 40 percent chance of showers. Low 12.
Sunday..Cloudy with 40 percent chance of showers. High 19.
Sunday night..Cloudy periods with 30 percent chance of showers.
 Low 13.
Monday..A mix of sun and cloud. High 21.
Normals for the period..Low 10. High 20.

City of Hamilton.
Wednesday night..Clear. Low plus 4.
Thursday..Sunny. High 15.
Thursday night..Cloudy periods. Low 7.
Friday..Cloudy. High 15.
Friday night..Cloudy with 60 percent chance of showers. Low 9.
Saturday..Cloudy with 40 percent chance of showers. High 13.
Saturday night..Cloudy with 40 percent chance of showers. Low 12.
Sunday..Cloudy with 40 percent chance of showers. High 19.
Sunday night..Cloudy periods. Low 13.
Monday..A mix of sun and cloud. High 21.
Normals for the period..Low 8. High 20.

Halton - Peel.
Wednesday night..Clear. Low plus 3.
Thursday..Sunny. High 16.
Thursday night..Cloudy. Low 6.
Friday..Cloudy. High 15.
Friday night..Cloudy with 40 percent chance of showers. Low 10.
Saturday..Cloudy with 40 percent chance of showers. High 13.
Saturday night..Cloudy with 40 percent chance of showers. Low 10.
Sunday..Cloudy with 40 percent chance of showers. High 20.
Sunday night..Cloudy periods. Low 11.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 8. High 20.

York - Durham.
Wednesday night..Clear. Low plus 4.
Thursday..Sunny. High 15.
Thursday night..Cloudy. Low 6.
Friday..Cloudy. High 15.
Friday night..Cloudy with 40 percent chance of showers. Low 10.
Saturday..Cloudy with 40 percent chance of showers. High 12.
Saturday night..Cloudy with 40 percent chance of showers. Low 11.
Sunday..Cloudy with 40 percent chance of showers. High 18.
Sunday night..Cloudy periods. Low 12.
Monday..A mix of sun and cloud. High 21.
Normals for the period..Low 8. High 19.

Huron - Perth.
Wednesday night..Clear. Low zero.
Thursday..Sunny. High 17.
Thursday night..Cloudy. Low 7.
Friday..Cloudy. High 16.
Friday night..Cloudy with 60 percent chance of showers. Low 10.
Saturday..Cloudy with 40 percent chance of showers. High 15.
Saturday night..Cloudy. Low 10.
Sunday..Cloudy. High 20.
Sunday night..Cloudy periods. Low 11.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 8. High 20.

Waterloo - Wellington.
Wednesday night..Clear. Low plus 2.
Thursday..Sunny. High 15.
Thursday night..Cloudy. Low 6.
Friday..Cloudy. High 17.
Friday night..Cloudy with 60 percent chance of showers. Low 10.
Saturday..Cloudy with 40 percent chance of showers. High 14.
Saturday night..Cloudy. Low 11.
Sunday..Cloudy. High 20.
Sunday night..Cloudy periods. Low 12.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 8. High 20.

Dufferin - Innisfil.
Wednesday night..Clear. Low plus 2.
Thursday..Sunny. High 15.
Thursday night..Cloudy. Low plus 5.
Friday..Cloudy. High 16.
Friday night..Cloudy with 60 percent chance of showers. Low 9.
Saturday..Cloudy with 40 percent chance of showers. High 13.
Saturday night..Cloudy. Low 9.
Sunday..A mix of sun and cloud. High 19.
Sunday night..Cloudy periods. Low 10.
Monday..A mix of sun and cloud. High 22.
Normals for the period..Low 7. High 20.

Grey - Bruce.
Wednesday night..Clear. Low plus 1.
Thursday..Sunny. High 16.
Thursday night..Cloudy. Low 7.
Friday..Cloudy. High 17.
Friday night..Cloudy with 40 percent chance of showers. Low 9.
Saturday..Cloudy with 40 percent chance of showers. High 13.
Saturday night..Cloudy. Low 9.
Sunday..Cloudy. High 18.
Sunday night..Cloudy periods. Low 10.
Monday..A mix of sun and cloud. High 22.
Normals for the period..Low 7. High 18.

Barrie - Orillia - Midland.
Wednesday night..Clear. Low plus 2.
Thursday..Sunny. High 16.
Thursday night..Cloudy periods. Low 6.
Friday..Cloudy. High 17.
Friday night..Cloudy with 40 percent chance of showers. Low 9.
Saturday..Cloudy with 40 percent chance of showers. High 14.
Saturday night..Cloudy. Low 9.
Sunday..Cloudy. High 19.
Sunday night..Cloudy periods. Low 9.
Monday..A mix of sun and cloud. High 22.
Normals for the period..Low 7. High 20.

Belleville - Quinte - Northumberland.
Wednesday night..Clear. Low plus 5.
Thursday..Sunny. High 16.
Thursday night..Cloudy. Low 7.
Friday..Cloudy. High 18.
Friday night..Cloudy with 30 percent chance of showers. Low 9.
Saturday..Cloudy with 40 percent chance of showers. High 14.
Saturday night..Cloudy with 30 percent chance of showers. Low 11.
Sunday..Cloudy with 30 percent chance of showers. High 20.
Sunday night..Cloudy periods. Low 11.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 8. High 20.

Kingston - Prince Edward.
Wednesday night..Clear. Low plus 5.
Thursday..Sunny. High 16.
Thursday night..Cloudy. Low 7.
Friday..Cloudy. High 18.
Friday night..Cloudy with 30 percent chance of showers. Low 9.
Saturday..Cloudy with 40 percent chance of showers. High 14.
Saturday night..Cloudy with 30 percent chance of showers. Low 11.
Sunday..Cloudy with 30 percent chance of showers. High 20.
Sunday night..Cloudy periods. Low 11.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 8. High 20.

Peterborough - Kawartha Lakes.
Wednesday night..Clear. Low plus 1.
Thursday..Sunny. High 20.
Thursday night..Cloudy. Low plus 4.
Friday..Cloudy. High 18.
Friday night..Cloudy with 30 percent chance of showers. Low 8.
Saturday..Cloudy with 40 percent chance of showers. High 15.
Saturday night..Cloudy with 30 percent chance of showers. Low 9.
Sunday..Cloudy with 30 percent chance of showers. High 20.
Sunday night..Cloudy periods. Low 10.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 7. High 20.

Stirling - Tweed - South Frontenac.
Wednesday night..Clear. Low plus 3.
Thursday..Sunny. High 17.
Thursday night..Cloudy periods. Low 6.
Friday..Cloudy. High 17.
Friday night..Cloudy with 30 percent chance of showers. Low 9.
Saturday..Cloudy with 40 percent chance of showers. High 14.
Saturday night..Cloudy with 30 percent chance of showers. Low 10.
Sunday..Cloudy with 30 percent chance of showers. High 20.
Sunday night..Cloudy periods. Low 11.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 8. High 20.

Bancroft - Bon Echo Park.
Wednesday night..Clear. Low zero.
Thursday..Sunny. High 17.
Thursday night..Cloudy periods. Low plus 2.
Friday..A mix of sun and cloud. High 19.
Friday night..Cloudy. Low 8.
Saturday..Cloudy with 40 percent chance of showers. High 15.
Saturday night..Cloudy with 30 percent chance of showers. Low 10.
Sunday..Cloudy with 30 percent chance of showers. High 20.
Sunday night..Cloudy periods. Low 10.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 6. High 21.

Brockville - Leeds and Grenville.
Wednesday night..Clear. Low plus 5.
Thursday..Sunny. High 16.
Thursday night..Cloudy periods. Low 8.
Friday..A mix of sun and cloud. High 19.
Friday night..Cloudy. Low 9.
Saturday..Cloudy with 40 percent chance of showers. High 15.
Saturday night..Cloudy with 40 percent chance of showers. Low 10.
Sunday..Cloudy with 40 percent chance of showers. High 18.
Sunday night..Cloudy periods. Low 11.
Monday..A mix of sun and cloud. High 22.
Normals for the period..Low 9. High 20.

City of Ottawa.
Wednesday night..Cloudy periods. Low plus 4.
Thursday..Sunny. High 17.
Thursday night..Clear. Low 6.
Friday..Sunny. High 21.
Friday night..Cloudy periods. Low 9.
Saturday..Cloudy. High 16.
Saturday night..Cloudy with 40 percent chance of showers. Low 10.
Sunday..Cloudy with 40 percent chance of showers. High 19.
Sunday night..Cloudy periods. Low 11.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 9. High 21.

Gatineau.
Wednesday night..Cloudy periods. Low plus 3.
Thursday..Sunny. High 18.
Thursday night..Clear. Low plus 4.
Friday..Sunny. High 22.
Friday night..Clear. Low 8.
Saturday..Cloudy. High 16.
Saturday night..Cloudy with 40 percent chance of showers. Low 10.
Sunday..Cloudy with 40 percent chance of showers. High 19.
Sunday night..Cloudy periods. Low 11.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 9. High 21.

Prescott and Russell.
Wednesday night..Cloudy periods. Low plus 4.
Thursday..Sunny. High 16.
Thursday night..Clear. Low plus 5.
Friday..Sunny. High 22.
Friday night..Cloudy periods. Low 9.
Saturday..Cloudy. High 16.
Saturday night..Cloudy with 40 percent chance of showers. Low 10.
Sunday..Cloudy with 40 percent chance of showers. High 18.
Sunday night..Cloudy periods. Low 11.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 9. High 21.

Cornwall - Morrisburg.
Wednesday night..Clear. Low plus 5.
Thursday..Sunny. High 16.
Thursday night..Clear. Low 6.
Friday..Sunny. High 20.
Friday night..Cloudy periods. Low 9.
Saturday..Cloudy. High 16.
Saturday night..Cloudy with 40 percent chance of showers. Low 10.
Sunday..Cloudy with 40 percent chance of showers. High 18.
Sunday night..Cloudy periods. Low 11.
Monday..A mix of sun and cloud. High 22.
Normals for the period..Low 8. High 21.

Smiths Falls - Lanark - Sharbot Lake.
Wednesday night..Clear. Low plus 3.
Thursday..Sunny. High 16.
Thursday night..Cloudy periods. Low plus 5.
Friday..Increasing cloudiness. High 19.
Friday night..Cloudy. Low 9.
Saturday..Cloudy with 40 percent chance of showers. High 15.
Saturday night..Cloudy with 40 percent chance of showers. Low 10.
Sunday..Cloudy with 40 percent chance of showers. High 19.
Sunday night..Cloudy periods. Low 10.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 9. High 20.

Parry Sound - Muskoka.
Wednesday night..Clear. Low plus 1.
Thursday..Sunny. High 15.
Thursday night..Cloudy periods. Low plus 4.
Friday..Cloudy. High 18.
Friday night..Cloudy. Low 9.
Saturday..Cloudy with 40 percent chance of showers. High 14.
Saturday night..Cloudy with 30 percent chance of showers. Low 8.
Sunday..A mix of sun and cloud. High 19.
Sunday night..Cloudy periods. Low 9.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 6. High 19.

Haliburton.
Wednesday night..Clear. Low minus 1.
Thursday..Sunny. High 16.
Thursday night..Cloudy periods. Low plus 3.
Friday..Increasing cloudiness. High 16.
Friday night..Cloudy. Low 8.
Saturday..Cloudy with 40 percent chance of showers. High 15.
Saturday night..Cloudy with 30 percent chance of showers. Low 9.
Sunday..Cloudy with 30 percent chance of showers. High 19.
Sunday night..Cloudy periods. Low 9.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 6. High 21.

Renfrew - Pembroke - Barry's Bay.
Wednesday night..Cloudy periods. Low plus 2.
Thursday..Sunny. High 16.
Thursday night..Clear. Low plus 3.
Friday..Sunny. High 20.
Friday night..Cloudy periods. Low 7.
Saturday..Cloudy with 40 percent chance of showers. High 16.
Saturday night..Cloudy with 30 percent chance of showers. Low 9.
Sunday..Cloudy with 30 percent chance of showers. High 19.
Sunday night..Cloudy periods. Low 9.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 6. High 21.

Algonquin.
Wednesday night..Clear. Low minus 1.
Thursday..Sunny. High 16.
Thursday night..Clear. Low zero.
Friday..Increasing cloudiness. High 20.
Friday night..Cloudy. Low 8.
Saturday..Cloudy with 40 percent chance of showers. High 15.
Saturday night..Cloudy with 30 percent chance of showers. Low 9.
Sunday..Cloudy with 30 percent chance of showers. High 19.
Sunday night..Cloudy periods. Low 9.
Monday..A mix of sun and cloud. High 23.
Normals for the period..Low 6. High 20.

Burk's Falls - Bayfield Inlet.
Wednesday night..Clear. Low minus 1.
Thursday..Sunny. High 16.
Thursday night..Cloudy periods. Low plus 1.
Friday..Sunny. High 18.
Friday night..Cloudy. Low 8.
Saturday..Cloudy with 40 percent chance of showers. High 15.
Saturday night..Cloudy with 30 percent chance of showers. Low 8.
Sunday..A mix of sun and cloud. High 19.
Sunday night..Cloudy periods. Low 9.
Monday..A mix of sun and cloud. High 22.
Normals for the period..Low 6. High 19.

End
$$$$^^

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