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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Tue Oct 6 2026 |
| Tonight: Clear. Increasing cloudiness near midnight then 40 percent chance of showers before morning. Wind west 20 km/h gusting to 40 becoming light this evening. Low plus 3 with risk of frost. Wednesday: Mainly cloudy with 40 percent chance of showers. Wind becoming southwest 30 km/h gusting to 50 in the morning. High 16. Uv index 4 or moderate. Wednesday Night: Mainly cloudy. 30 percent chance of showers in the evening. Wind southwest 30 km/h gusting to 50 becoming light after midnight. Wind becoming southwest 20 before morning. Low 10. Thursday: Cloudy with 40 percent chance of showers. High 16. Thursday Night: Cloudy periods with 30 percent chance of showers. Low 9. Friday: Cloudy with 40 percent chance of showers. High 15. Friday Night: Cloudy periods with 40 percent chance of showers. Low plus 2. Saturday: Sunny. High 12. Saturday Night: Clear. Low plus 5. Sunday: A mix of sun and cloud. High 18. Sunday Night: Cloudy periods with 30 percent chance of showers. Low 10. Monday: A mix of sun and cloud with 30 percent chance of showers. High 19. |
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