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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 Sep 12 2026
Tonight: Clear. Increasing cloudiness this evening then 60 percent chance of showers overnight. Risk of a thunderstorm overnight. Wind southwest 20 km/h gusting to 40 becoming light early this evening. Low 19.
Sunday: Mainly cloudy with 60 percent chance of showers and risk of a thunderstorm. Wind becoming west 30 km/h gusting to 50 in the morning. High 25. Humidex 33. Uv index 4 or moderate.
Sunday Night: Increasing cloudiness early in the evening. Wind west 20 km/h gusting to 40 becoming light in the evening. Wind becoming northwest 20 gusting to 40 near midnight. Low 10.
Monday: Sunny. High 18.
Monday Night: Clear. Low plus 5.
Tuesday: A mix of sun and cloud. High 21.
Tuesday Night: Cloudy with 60 percent chance of showers. Low 15.
Wednesday: Clearing. High 24.
Wednesday Night: Increasing cloudiness. Low 13.
Thursday: Cloudy with 60 percent chance of showers. High 21.
Thursday Night: Cloudy. Low 11.
Friday: A mix of sun and cloud. High 20.

regional radar

Cornwall
🌧 Rain Snow 🧊 Ice 🌨 Mix

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this day in history

On September 12th

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