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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1859 ET Tue Nov 3 2026 |
| Tonight: Cloudy. 40 percent chance of showers this evening. Becoming partly cloudy near midnight. Fog patches developing overnight. Low 14. Wednesday: Sunny. Becoming a mix of sun and cloud in the afternoon. Fog patches dissipating in the morning. Wind becoming southwest 20 km/h in the morning. High 22. Uv index 3 or moderate. Wednesday Night: Clear. Increasing cloudiness after midnight then a few showers. Low 15. Thursday: Showers. High 19. Thursday Night: Cloudy periods with 40 percent chance of showers. Low 11. Friday: Cloudy. High 16. Friday Night: Cloudy with 60 percent chance of showers. Low 8. Saturday: Cloudy with 40 percent chance of showers. High 10. Saturday Night: Cloudy with 30 percent chance of showers. Low plus 2. Sunday: Cloudy. High 8. Sunday Night: Cloudy with 30 percent chance of showers. Low plus 2. Monday: Cloudy with 30 percent chance of showers. High 8. |
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