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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 Mon Aug 17 2026
Tonight: Clearing early this evening. Fog patches developing after midnight. Low 14.
Tuesday: Mainly sunny. Fog patches dissipating in the morning. High 25. Humidex 29. Uv index 7 or high.
Tuesday Night: Clear. Increasing cloudiness after midnight then 60 percent chance of showers before morning. Risk of a thunderstorm before morning. Low 16.
Wednesday: Cloudy with 60 percent chance of showers. High 21.
Wednesday Night: Cloudy periods. Low 12.
Thursday: A mix of sun and cloud with 30 percent chance of showers. High 24.
Thursday Night: Cloudy periods with 30 percent chance of showers. Low 10.
Friday: Sunny. High 26.
Friday Night: Cloudy periods. Low 16.
Saturday: Cloudy. High 26.
Saturday Night: Cloudy with 40 percent chance of showers. Low 16.
Sunday: Cloudy with 60 percent chance of showers. High 22.

regional radar

Cornwall
🌧 Rain Snow 🧊 Ice 🌨 Mix

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