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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 0500 ET Sat Sep 5 2026
Today: Increasing cloudiness early this morning. 40 percent chance of showers this afternoon. Wind becoming northeast 30 km/h this afternoon. High 23. Humidex 27. Uv index 4 or moderate.
Tonight: Mainly cloudy. 30 percent chance of showers early this evening. Fog patches developing overnight. Wind northeast 20 km/h becoming light this evening. Low 12.
Sunday: Clearing. Fog patches dissipating in the morning. High 23. Humidex 26. Uv index 6 or high.
Sunday Night: Clear. Low 9.
Monday: Sunny. High 26.
Monday Night: Clear. Low 11.
Tuesday: A mix of sun and cloud. High 23.
Tuesday Night: Cloudy with 30 percent chance of showers. Low 12.
Wednesday: Cloudy with 60 percent chance of showers. High 22.
Wednesday Night: Cloudy with 60 percent chance of showers. Low 17.
Thursday: A mix of sun and cloud. High 22.
Thursday Night: Cloudy periods. Low 9.
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 5th

explore the seaway city

Explore the Seaway City

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Discover the Counties of SDG

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