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Current conditions
Cornwall skaters at the Optimist Park Skatepark
Shadow

forecast

detailed forecast

Extented weather forecast for Cornwall Ontario and the Seaway
Issued by Environment Canada at 1530 ET Sat Aug 22 2026
Tonight: Partly cloudy. 40 percent chance of showers late this evening and overnight. Low 20.
Sunday: Showers with risk of a thunderstorm. Wind becoming south 30 km/h late in the afternoon. High 23. Humidex 30. Uv index 3 or moderate.
Sunday Night: Cloudy with 60 percent chance of showers and risk of a thunderstorm. Wind southwest 20 km/h gusting to 40 becoming light near midnight. Wind becoming southwest 20 after midnight. Low 16.
Monday: Cloudy with 60 percent chance of showers. High 20.
Monday Night: Cloudy with 40 percent chance of showers. Low 14.
Tuesday: Cloudy with 30 percent chance of showers. High 22.
Tuesday Night: Cloudy periods. Low 13.
Wednesday: A mix of sun and cloud. High 26.
Wednesday Night: Cloudy periods with 30 percent chance of showers. Low 15.
Thursday: Cloudy with 30 percent chance of showers. High 25.
Thursday Night: Cloudy with 30 percent chance of showers. Low 17.
Friday: Cloudy with 30 percent chance of showers. High 24.

regional radar

Cornwall
🌧 Rain Snow 🧊 Ice 🌨 Mix

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On August 22nd

explore the seaway city

Explore the Seaway City

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Discover the Counties of SDG

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