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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1630 ET Wed Oct 7 2026 |
| Tonight: Mainly cloudy. 70 percent chance of showers early this evening. 40 percent chance of showers overnight. Risk of a thunderstorm. Wind southwest 20 km/h gusting to 40 becoming light overnight. Low 8. Thursday: Cloudy with 40 percent chance of showers. Risk of a thunderstorm. Wind becoming west 20 km/h gusting to 40 in the morning. High 17. Uv index 2 or low. Thursday Night: Mainly cloudy with 40 percent chance of showers. Wind west 20 km/h becoming light in the evening. Low plus 5. Friday: A mix of sun and cloud with 40 percent chance of showers. High 13. Friday Night: Clear. Low plus 4. Saturday: Sunny. High 15. Saturday Night: Cloudy periods. Low 10. Sunday: Cloudy. High 22. Sunday Night: Cloudy with 30 percent chance of showers. Low 12. Monday: Cloudy with 30 percent chance of showers. High 18. Monday Night: Cloudy with 40 percent chance of showers. Low 7. Tuesday: Cloudy with 40 percent chance of showers. High 12. |
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