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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Thu Sep 3 2026 |
| Tonight: Partly cloudy. 30 percent chance of showers this evening. Wind west 20 km/h gusting to 40 becoming light early this evening. Low 15. Friday: Mainly cloudy. 40 percent chance of showers in the afternoon. Wind becoming northwest 20 km/h gusting to 40 in the morning. High 25. Humidex 30. Uv index 6 or high. Friday Night: Cloudy. 40 percent chance of showers in the evening. Wind northwest 20 km/h gusting to 40 becoming light in the evening. Low 12. Saturday: A mix of sun and cloud with 40 percent chance of showers. High 24. Saturday Night: Cloudy periods. Low 14. Sunday: Sunny. High 24. Sunday Night: Clear. Low 9. Monday: Sunny. High 25. Monday Night: Cloudy periods. Low 12. Tuesday: A mix of sun and cloud with 30 percent chance of showers. High 22. Tuesday Night: Cloudy periods. Low 12. Wednesday: Cloudy with 40 percent chance of showers. High 23. |
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