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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1430 ET Tue Dec 1 2026 |
| Tonight: Mainly cloudy. Clearing this evening. Wind west 20 km/h becoming light early this evening. Low minus 3. Wind chill minus 7 overnight. Sunday: Sunny. Becoming a mix of sun and cloud in the morning. Wind becoming southwest 20 km/h gusting to 40 in the morning. High 15. Uv index 2 or low. Sunday Night: Partly cloudy. Becoming cloudy late in the evening. Wind southwest 20 km/h gusting to 40. Low 6. Monday: Cloudy. High 16. Monday Night: Cloudy. Low 6. Tuesday: Cloudy. High 16. Tuesday Night: Cloudy. Low 8. Wednesday: Cloudy. High 17. Wednesday Night: Cloudy with 30 percent chance of showers. Low 9. Thursday: Cloudy with 60 percent chance of showers. High 15. Thursday Night: Cloudy with 60 percent chance of showers. Low 7. Friday: Cloudy with 60 percent chance of showers. High 11. |
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