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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Thu Sep 10 2026 |
| Tonight: Partly cloudy. Clearing late this evening. Fog patches developing overnight. Wind northwest 30 km/h gusting to 50 becoming light this evening. Low 9. Friday: Sunny. Fog patches dissipating in the morning. Wind west 20 km/h becoming light in the afternoon. High 21. Uv index 6 or high. Friday Night: Clear. Low 10. Saturday: Increasing cloudiness. High 25. Saturday Night: Cloudy with 40 percent chance of showers. Low 16. Sunday: Cloudy with 60 percent chance of showers. High 25. Sunday Night: Cloudy periods with 30 percent chance of showers. Low 12. Monday: Sunny. High 20. Monday Night: Clear. Low 12. Tuesday: A mix of sun and cloud with 60 percent chance of showers. High 25. Tuesday Night: Cloudy periods with 60 percent chance of showers. Low 14. Wednesday: A mix of sun and cloud with 40 percent chance of showers. High 22. |
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