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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Tue Sep 15 2026 |
| Tonight: Cloudy with 40 percent chance of showers. Low 15. Wednesday: Cloudy. Becoming a mix of sun and cloud late in the afternoon. High 25. Humidex 32. Uv index 4 or moderate. Wednesday Night: Increasing cloudiness. Low 12. Thursday: Cloudy with 30 percent chance of showers. High 21. Thursday Night: Clear. Low 13. Friday: Sunny. High 19. Friday Night: Clear. Low 7. Saturday: Cloudy. High 17. Saturday Night: Cloudy with 60 percent chance of showers. Low 11. Sunday: Cloudy with 60 percent chance of showers. High 18. Sunday Night: Cloudy. Low 10. Monday: Cloudy. High 17. |
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