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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 160900
Extended forecasts from Sunday night 17 May to Friday 22 May for
Southern Ontario and the National Capital Region issued by
Environment Canada at 5:00 a.m. EDT Saturday 16 May 2026.
The next scheduled forecast will be issued at 11:00 a.m. EDT.

City of Toronto.
Sunday night..Cloudy periods. Low 14.
Monday..Sunny. High 28.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 18.
Tuesday..A mix of sun and cloud with 40 percent chance of showers.
 High 28.
Tuesday night..Cloudy periods with 60 percent chance of showers.
 Low 15.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 22.
Wednesday night..Clear. Low 6.
Thursday..Sunny. High 16.
Thursday night..Clear. Low 6.
Friday..A mix of sun and cloud with 60 percent chance of showers.
 High 16.
Normals for the period..Low 9. High 19.

Windsor - Essex - Chatham-Kent.
Sunday night..Clear. Low 13.
Monday..Sunny. High 31.
Monday night..Clear. Low 20.
Tuesday..A mix of sun and cloud with 40 percent chance of showers.
 High 31.
Tuesday night..Cloudy with 60 percent chance of showers. Low 16.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 25.
Wednesday night..Cloudy periods. Low plus 5.
Thursday..A mix of sun and cloud. High 17.
Thursday night..Cloudy periods. Low 8.
Friday..Cloudy. High 16.
Normals for the period..Low 9. High 21.

Sarnia - Lambton.
Sunday night..Clear. Low 14.
Monday..A mix of sun and cloud with 30 percent chance of showers.
 High 31.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 20.
Tuesday..A mix of sun and cloud with 30 percent chance of showers.
 High 31.
Tuesday night..Cloudy with 60 percent chance of showers. Low 14.
Wednesday..A mix of sun and cloud with 60 percent chance of showers.
 High 22.
Wednesday night..Cloudy periods. Low plus 5.
Thursday..A mix of sun and cloud. High 15.
Thursday night..Cloudy periods. Low 6.
Friday..Cloudy with 60 percent chance of showers. High 15.
Normals for the period..Low 8. High 21.

Elgin.
Sunday night..Clear. Low 12.
Monday..A mix of sun and cloud with 30 percent chance of showers.
 High 29.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 19.
Tuesday..A mix of sun and cloud with 30 percent chance of showers.
 High 29.
Tuesday night..Cloudy with 60 percent chance of showers. Low 15.
Wednesday..A mix of sun and cloud with 60 percent chance of showers.
 High 22.
Wednesday night..Cloudy periods. Low plus 5.
Thursday..A mix of sun and cloud. High 17.
Thursday night..Cloudy periods. Low plus 5.
Friday..Cloudy with 60 percent chance of showers. High 16.
Normals for the period..Low 9. High 20.

London - Middlesex.
Sunday night..Clear. Low 14.
Monday..A mix of sun and cloud with 30 percent chance of showers.
 Windy. High 30.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 19.
Tuesday..A mix of sun and cloud with 30 percent chance of showers.
 Windy. High 30.
Tuesday night..Cloudy with 60 percent chance of showers. Low 14.
Wednesday..A mix of sun and cloud with 60 percent chance of showers.
 High 22.
Wednesday night..Cloudy periods. Low plus 4.
Thursday..A mix of sun and cloud. High 17.
Thursday night..Cloudy periods. Low plus 5.
Friday..Cloudy with 60 percent chance of showers. High 16.
Normals for the period..Low 8. High 20.

Simcoe - Delhi - Norfolk.
Sunday night..Clearing. Low 12.
Monday..Sunny. High 29.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 18.
Tuesday..A mix of sun and cloud with 40 percent chance of showers.
 Windy. High 29.
Tuesday night..Cloudy with 60 percent chance of showers. Low 15.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 20.
Wednesday night..Cloudy periods. Low plus 5.
Thursday..A mix of sun and cloud. High 17.
Thursday night..Cloudy periods. Low plus 5.
Friday..Cloudy with 60 percent chance of showers. High 16.
Normals for the period..Low 8. High 20.

Dunnville - Caledonia - Haldimand.
Sunday night..Clearing. Low 14.
Monday..Sunny. High 30.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 19.
Tuesday..A mix of sun and cloud with 40 percent chance of showers.
 Windy. High 29.
Tuesday night..Cloudy with 60 percent chance of showers. Low 15.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 21.
Wednesday night..Cloudy periods. Low plus 5.
Thursday..A mix of sun and cloud. High 16.
Thursday night..Cloudy periods. Low 6.
Friday..Cloudy with 60 percent chance of showers. High 15.
Normals for the period..Low 8. High 19.

Oxford - Brant.
Sunday night..Clearing. Low 12.
Monday..Sunny. High 30.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 19.
Tuesday..A mix of sun and cloud with 40 percent chance of showers.
 Windy. High 30.
Tuesday night..Cloudy with 60 percent chance of showers. Low 14.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 21.
Wednesday night..Cloudy periods. Low plus 4.
Thursday..A mix of sun and cloud. High 16.
Thursday night..Cloudy periods. Low plus 5.
Friday..Cloudy with 60 percent chance of showers. High 16.
Normals for the period..Low 8. High 20.

Niagara.
Sunday night..Cloudy periods. Low 16.
Monday..Sunny. High 28.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 17.
Tuesday..A mix of sun and cloud with 40 percent chance of showers.
 High 28.
Tuesday night..Cloudy with 60 percent chance of showers. Low 15.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 21.
Wednesday night..Cloudy periods. Low 7.
Thursday..A mix of sun and cloud. High 15.
Thursday night..Cloudy periods. Low 8.
Friday..Cloudy with 60 percent chance of showers. High 14.
Normals for the period..Low 9. High 19.

City of Hamilton.
Sunday night..Cloudy periods. Low 14.
Monday..Sunny. High 29.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 18.
Tuesday..A mix of sun and cloud with 40 percent chance of showers.
 Windy. High 29.
Tuesday night..Cloudy with 60 percent chance of showers. Low 15.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 21.
Wednesday night..Clear. Low 6.
Thursday..Sunny. High 15.
Thursday night..Clear. Low 7.
Friday..A mix of sun and cloud with 60 percent chance of showers.
 High 14.
Normals for the period..Low 8. High 19.

Halton - Peel.
Sunday night..Cloudy periods. Low 12.
Monday..Sunny. High 29.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 18.
Tuesday..A mix of sun and cloud with 40 percent chance of showers.
 High 29.
Tuesday night..Cloudy with 60 percent chance of showers. Low 14.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 22.
Wednesday night..Cloudy periods. Low plus 4.
Thursday..A mix of sun and cloud. High 16.
Thursday night..Cloudy periods. Low plus 4.
Friday..A mix of sun and cloud with 60 percent chance of showers.
 High 17.
Normals for the period..Low 7. High 19.

York - Durham.
Sunday night..Cloudy periods. Low 13.
Monday..Sunny. High 29.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 18.
Tuesday..A mix of sun and cloud with 40 percent chance of showers.
 High 29.
Tuesday night..Cloudy with 60 percent chance of showers. Low 14.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 21.
Wednesday night..Cloudy periods. Low plus 5.
Thursday..Sunny. High 16.
Thursday night..Clear. Low plus 5.
Friday..A mix of sun and cloud with 60 percent chance of showers.
 High 15.
Normals for the period..Low 8. High 19.

Huron - Perth.
Sunday night..Clearing. Low 15.
Monday..A mix of sun and cloud with 30 percent chance of showers.
 Windy. High 30.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 19.
Tuesday..A mix of sun and cloud with 30 percent chance of showers.
 Windy. High 30.
Tuesday night..Cloudy with 60 percent chance of showers. Low 11.
Wednesday..A mix of sun and cloud with 60 percent chance of showers.
 High 17.
Wednesday night..Cloudy periods. Low plus 3.
Thursday..A mix of sun and cloud. High 15.
Thursday night..Cloudy periods. Low plus 4.
Friday..Cloudy with 60 percent chance of showers. High 15.
Normals for the period..Low 7. High 19.

Waterloo - Wellington.
Sunday night..Clear. Low 12.
Monday..Sunny. High 29.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 18.
Tuesday..A mix of sun and cloud with 40 percent chance of showers.
 Windy. High 29.
Tuesday night..Cloudy with 60 percent chance of showers. Low 13.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 18.
Wednesday night..Cloudy periods. Low plus 1.
Thursday..A mix of sun and cloud. High 16.
Thursday night..Cloudy periods. Low plus 3.
Friday..Cloudy with 60 percent chance of showers. High 16.
Normals for the period..Low 7. High 19.

Dufferin - Innisfil.
Sunday night..Clearing. Low 14.
Monday..Sunny. High 28.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 18.
Tuesday..A mix of sun and cloud with 40 percent chance of showers.
 High 28.
Tuesday night..Cloudy periods with 60 percent chance of showers.
 Low 12.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 18.
Wednesday night..Cloudy periods. Low plus 3.
Thursday..A mix of sun and cloud. High 15.
Thursday night..Cloudy periods. Low plus 4.
Friday..A mix of sun and cloud with 60 percent chance of showers.
 High 17.
Normals for the period..Low 6. High 19.

Grey - Bruce.
Sunday night..Clearing. Low 16.
Monday..A mix of sun and cloud with 30 percent chance of showers.
 High 28.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 18.
Tuesday..A mix of sun and cloud with 30 percent chance of showers.
 High 28.
Tuesday night..Cloudy with 60 percent chance of showers. Low 11.
Wednesday..A mix of sun and cloud with 60 percent chance of showers.
 High 16.
Wednesday night..Cloudy periods. Low plus 2.
Thursday..A mix of sun and cloud. High 14.
Thursday night..Clear. Low plus 3.
Friday..A mix of sun and cloud with 60 percent chance of showers.
 High 16.
Normals for the period..Low 7. High 18.

Barrie - Orillia - Midland.
Sunday night..Cloudy periods. Low 12.
Monday..Sunny. High 27.
Monday night..Cloudy periods with 40 percent chance of showers.
 Low 16.
Tuesday..Cloudy with 40 percent chance of showers. High 26.
Tuesday night..Cloudy with 60 percent chance of showers. Low 11.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 17.
Wednesday night..Cloudy periods. Low plus 2.
Thursday..A mix of sun and cloud. High 15.
Thursday night..Cloudy periods. Low plus 3.
Friday..A mix of sun and cloud with 60 percent chance of showers.
 High 17.
Normals for the period..Low 6. High 19.

Belleville - Quinte - Northumberland.
Sunday night..Cloudy periods. Low 12.
Monday..Sunny. High 27.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 15.
Tuesday..A mix of sun and cloud with 40 percent chance of showers.
 High 27.
Tuesday night..Cloudy periods with 60 percent chance of showers.
 Low 15.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 20.
Wednesday night..Clear. Low 6.
Thursday..Sunny. High 17.
Thursday night..Clear. Low plus 5.
Friday..A mix of sun and cloud. High 18.
Normals for the period..Low 8. High 19.

Kingston - Prince Edward.
Sunday night..Cloudy periods. Low 11.
Monday..Sunny. High 27.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 14.
Tuesday..A mix of sun and cloud with 30 percent chance of showers.
 High 27.
Tuesday night..Cloudy with 60 percent chance of showers. Low 15.
Wednesday..A mix of sun and cloud. High 20.
Wednesday night..Clear. Low 6.
Thursday..Sunny. High 17.
Thursday night..Clear. Low plus 5.
Friday..A mix of sun and cloud. High 18.
Normals for the period..Low 8. High 19.

Peterborough - Kawartha Lakes.
Sunday night..Cloudy periods. Low 13.
Monday..Sunny. High 27.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 15.
Tuesday..A mix of sun and cloud with 40 percent chance of showers.
 High 28.
Tuesday night..Cloudy with 60 percent chance of showers. Low 13.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 18.
Wednesday night..Cloudy periods. Low plus 3.
Thursday..Sunny. High 18.
Thursday night..Clear. Low plus 3.
Friday..A mix of sun and cloud. High 19.
Normals for the period..Low 7. High 20.

Stirling - Tweed - South Frontenac.
Sunday night..Cloudy periods. Low 11.
Monday..Sunny. High 27.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 17.
Tuesday..A mix of sun and cloud with 30 percent chance of showers.
 High 27.
Tuesday night..Cloudy periods with 60 percent chance of showers.
 Low 15.
Wednesday..A mix of sun and cloud. High 21.
Wednesday night..Clear. Low plus 5.
Thursday..Sunny. High 18.
Thursday night..Clear. Low plus 4.
Friday..A mix of sun and cloud. High 18.
Normals for the period..Low 7. High 20.

Bancroft - Bon Echo Park.
Sunday night..Cloudy periods. Low 8.
Monday..Sunny. High 27.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 13.
Tuesday..A mix of sun and cloud with 30 percent chance of showers.
 High 27.
Tuesday night..Cloudy with 60 percent chance of showers. Low 14.
Wednesday..A mix of sun and cloud. High 19.
Wednesday night..Cloudy periods. Low plus 4.
Thursday..Sunny. High 18.
Thursday night..Clear. Low plus 3.
Friday..Sunny. High 19.
Normals for the period..Low 7. High 20.

Brockville - Leeds and Grenville.
Sunday night..Increasing cloudiness. Low 10.
Monday..Sunny. High 27.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 16.
Tuesday..A mix of sun and cloud with 30 percent chance of showers.
 High 28.
Tuesday night..Cloudy with 40 percent chance of showers. Low 15.
Wednesday..A mix of sun and cloud. High 24.
Wednesday night..Clear. Low 7.
Thursday..Sunny. High 18.
Thursday night..Clear. Low 6.
Friday..A mix of sun and cloud. High 19.
Normals for the period..Low 8. High 19.

City of Ottawa.
Sunday night..Clear. Low 10.
Monday..Sunny. High 28.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 16.
Tuesday..A mix of sun and cloud with 30 percent chance of showers.
 High 29.
Tuesday night..Cloudy with 40 percent chance of showers. Low 14.
Wednesday..A mix of sun and cloud. High 24.
Wednesday night..Cloudy periods. Low 7.
Thursday..Sunny. High 18.
Thursday night..Clear. Low 6.
Friday..Sunny. High 20.
Normals for the period..Low 9. High 20.

Gatineau.
Sunday night..Clear. Low 9.
Monday..Sunny. High 28.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 16.
Tuesday..A mix of sun and cloud with 30 percent chance of showers.
 High 29.
Tuesday night..Cloudy with 40 percent chance of showers. Low 14.
Wednesday..A mix of sun and cloud. High 24.
Wednesday night..Cloudy periods. Low 7.
Thursday..A mix of sun and cloud. High 18.
Thursday night..Cloudy periods. Low 6.
Friday..A mix of sun and cloud. High 20.
Normals for the period..Low 8. High 20.

Prescott and Russell.
Sunday night..Clear. Low 11.
Monday..Sunny. High 27.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 16.
Tuesday..A mix of sun and cloud with 30 percent chance of showers.
 High 29.
Tuesday night..Cloudy with 40 percent chance of showers. Low 14.
Wednesday..A mix of sun and cloud. High 24.
Wednesday night..Cloudy periods. Low 8.
Thursday..A mix of sun and cloud. High 18.
Thursday night..Cloudy periods. Low 6.
Friday..A mix of sun and cloud. High 20.
Normals for the period..Low 9. High 20.

Cornwall - Morrisburg.
Sunday night..Clear. Low 9.
Monday..Sunny. High 27.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 16.
Tuesday..A mix of sun and cloud with 30 percent chance of showers.
 High 29.
Tuesday night..Cloudy periods with 40 percent chance of showers.
 Low 14.
Wednesday..A mix of sun and cloud. High 24.
Wednesday night..Cloudy periods. Low 7.
Thursday..A mix of sun and cloud. High 18.
Thursday night..Cloudy periods. Low 6.
Friday..A mix of sun and cloud. High 19.
Normals for the period..Low 8. High 20.

Smiths Falls - Lanark - Sharbot Lake.
Sunday night..Increasing cloudiness. Low 12.
Monday..Clearing. High 28.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 16.
Tuesday..A mix of sun and cloud with 30 percent chance of showers.
 High 29.
Tuesday night..Cloudy periods with 40 percent chance of showers.
 Low 15.
Wednesday..A mix of sun and cloud. High 23.
Wednesday night..Cloudy periods. Low 6.
Thursday..Sunny. High 18.
Thursday night..Clear. Low plus 5.
Friday..Sunny. High 19.
Normals for the period..Low 8. High 20.

Parry Sound - Muskoka.
Sunday night..Cloudy periods. Low 12.
Monday..Sunny. High 27.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 17.
Tuesday..Cloudy with 30 percent chance of showers. High 26.
Tuesday night..Cloudy with 60 percent chance of showers. Low 10.
Wednesday..A mix of sun and cloud with 60 percent chance of showers.
 High 16.
Wednesday night..Cloudy periods. Low plus 1.
Thursday..A mix of sun and cloud. High 14.
Thursday night..Cloudy periods. Low plus 2.
Friday..A mix of sun and cloud. High 18.
Normals for the period..Low 6. High 19.

Haliburton.
Sunday night..Cloudy periods. Low 12.
Monday..Sunny. High 27.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 17.
Tuesday..A mix of sun and cloud with 40 percent chance of showers.
 High 29.
Tuesday night..Cloudy with 60 percent chance of showers. Low 12.
Wednesday..A mix of sun and cloud with 40 percent chance of showers.
 High 18.
Wednesday night..Cloudy periods. Low plus 3.
Thursday..Sunny. High 17.
Thursday night..Cloudy periods. Low plus 3.
Friday..A mix of sun and cloud. High 19.
Normals for the period..Low plus 5. High 20.

Renfrew - Pembroke - Barry's Bay.
Sunday night..Increasing cloudiness. Low 8.
Monday..Clearing. High 27.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 16.
Tuesday..Cloudy with 30 percent chance of showers. High 27.
Tuesday night..Cloudy. Low 13.
Wednesday..A mix of sun and cloud. High 20.
Wednesday night..Cloudy periods. Low plus 4.
Thursday..Sunny. High 18.
Thursday night..Clear. Low plus 3.
Friday..Sunny. High 20.
Normals for the period..Low 6. High 20.

Algonquin.
Sunday night..Increasing cloudiness. Low 6.
Monday..Sunny. High 26.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 13.
Tuesday..Cloudy with 30 percent chance of showers. High 26.
Tuesday night..Cloudy. Low 12.
Wednesday..A mix of sun and cloud. High 18.
Wednesday night..Cloudy periods. Low plus 3.
Thursday..A mix of sun and cloud. High 17.
Thursday night..Cloudy periods. Low plus 3.
Friday..A mix of sun and cloud. High 19.
Normals for the period..Low plus 5. High 20.

Burk's Falls - Bayfield Inlet.
Sunday night..Cloudy. Low 11.
Monday..Sunny. High 26.
Monday night..Cloudy periods with 30 percent chance of showers.
 Low 13.
Tuesday..Cloudy with 30 percent chance of showers. High 23.
Tuesday night..Cloudy with 60 percent chance of showers. Low 9.
Wednesday..A mix of sun and cloud with 60 percent chance of showers.
 High 14.
Wednesday night..Cloudy periods. Low plus 2.
Thursday..A mix of sun and cloud. High 15.
Thursday night..Cloudy periods. Low plus 3.
Friday..A mix of sun and cloud. High 18.
Normals for the period..Low 6. High 18.

End
$$$$^^

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