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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Tue Sep 29 2026 |
| Tonight: Cloudy. Becoming partly cloudy this evening. Fog patches developing overnight. Low 7. Wednesday: A mix of sun and cloud. Fog patches dissipating in the morning. High 21. Uv index 5 or moderate. Wednesday Night: Partly cloudy. Becoming cloudy after midnight. Low 16. Thursday: Cloudy with 30 percent chance of showers. High 24. Thursday Night: Cloudy. Low 14. Friday: Cloudy with 60 percent chance of showers. High 17. Friday Night: Clear. Low 6. Saturday: Sunny. High 18. Saturday Night: Increasing cloudiness. Low 7. Sunday: Cloudy. High 15. Sunday Night: Cloudy periods. Low plus 5. Monday: A mix of sun and cloud. High 13. |
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