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Current conditions
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forecast

detailed forecast

Extented weather forecast for Cornwall Ontario and the Seaway
Issued by Environment Canada at 1500 utc Jun 09 2026
Today: Sunny. High 30. Humidex 33. Uv index 9 or very high.
Tonight: Clear. Increasing cloudiness late this evening then 40 percent chance of showers overnight. Showers beginning before morning. Risk of a thunderstorm overnight. Low 19.
Wednesday: Showers with risk of a thunderstorm. Amount 10 to 20 mm. Temperature steady near 22. Humidex 29.
Wednesday Night: Cloudy with 40 percent chance of showers. Low 18.
Thursday: Cloudy with 60 percent chance of showers. High 29.
Thursday Night: Cloudy periods with 30 percent chance of showers. Low 19.
Friday: Cloudy with 60 percent chance of showers. High 31.
Friday Night: Cloudy with 30 percent chance of showers. Low 17.
Saturday: A mix of sun and cloud. High 26.
Saturday Night: Cloudy periods. Low 17.
Sunday: Cloudy with 30 percent chance of showers. High 24.
Sunday Night: Cloudy with 30 percent chance of showers. Low 14.
Monday: Cloudy. High 22.

regional radar

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