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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 Sun Aug 16 2026
Tonight: Cloudy. A few showers beginning late this evening. Risk of a thunderstorm late this evening and overnight. Low 18.
Monday: Cloudy with 40 percent chance of showers. High 25. Humidex 33. Uv index 4 or moderate.
Monday Night: Mainly cloudy. 30 percent chance of showers in the evening. Fog patches developing after midnight. Low 13.
Tuesday: Sunny. High 26.
Tuesday Night: Cloudy periods with 30 percent chance of showers. Low 19.
Wednesday: Cloudy with 60 percent chance of showers. High 22.
Wednesday Night: Clear. Low 13.
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 12.
Friday: A mix of sun and cloud. High 25.
Friday Night: Cloudy periods. Low 14.
Saturday: Cloudy. High 23.

regional radar

Cornwall
🌧 Rain Snow 🧊 Ice 🌨 Mix

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On August 16th

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Explore the Seaway City

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Discover the Counties of SDG

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