forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Thu Oct 1 2026 |
| Tonight: Cloudy. 40 percent chance of showers early this evening. Showers beginning early this evening. Amount 10 to 15 mm. Wind southwest 30 km/h gusting to 50 becoming light early this evening. Wind becoming southwest 20 near midnight. Low 15. Friday: Showers ending near noon then cloudy. Amount 5 to 10 mm. Wind becoming northwest 30 km/h in the afternoon. High 18. Uv index 4 or moderate. Friday Night: Partly cloudy. Becoming clear near midnight. Wind northwest 30 km/h becoming light after midnight. Low 8. Saturday: Sunny. High 16. Saturday Night: Clear. Low plus 5. Sunday: A mix of sun and cloud. High 19. Sunday Night: Cloudy with 30 percent chance of showers. Low 8. Monday: Clearing. High 13. Monday Night: Clear. Low plus 1. Tuesday: Sunny. High 13. Tuesday Night: Cloudy periods. Low plus 3. Wednesday: A mix of sun and cloud. High 16. |
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