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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 Tue Jul 28 2026
Tonight: Showers. Risk of a thunderstorm this evening. Local amount 10 to 20 mm. Low 20.
Wednesday: Showers. Risk of a thunderstorm in the afternoon. Local amount 10 to 20 mm. Wind becoming northeast 30 km/h late in the afternoon. Temperature steady near 20. Humidex 29. Uv index 3 or moderate.
Wednesday Night: Showers. Risk of a thunderstorm early in the evening. Wind northeast 30 km/h becoming light after midnight. Temperature steady near 18.
Thursday: A mix of sun and cloud with 40 percent chance of showers. High 22.
Thursday Night: Clear. Low 18.
Friday: Sunny. High 27.
Friday Night: Cloudy periods. Low 18.
Saturday: Cloudy. High 27.
Saturday Night: Cloudy. Low 19.
Sunday: Cloudy with 40 percent chance of showers. High 23.
Sunday Night: Cloudy with 40 percent chance of showers. Low 18.
Monday: Cloudy. High 26.

regional radar

Cornwall
🌧 Rain Snow 🧊 Ice 🌨 Mix

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On July 28th

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