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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 0500 ET Thu Sep 10 2026 |
| Today: A mix of sun and cloud. Wind west 30 km/h gusting to 50. High 22. Humidex 25. Uv index 7 or high. Tonight: Clearing. Wind northwest 30 km/h becoming light this evening. Low 8. Friday: Sunny. Wind becoming west 20 km/h in the morning. High 21. Uv index 6 or high. Friday Night: Clear. Low 10. Saturday: Sunny. High 25. Saturday Night: Cloudy periods with 40 percent chance of showers. Low 16. Sunday: Cloudy with 60 percent chance of showers. High 25. Sunday Night: Cloudy with 30 percent chance of showers. Low 12. Monday: A mix of sun and cloud with 30 percent chance of showers. High 21. Monday Night: Cloudy periods with 30 percent chance of showers. Low 12. Tuesday: Cloudy with 60 percent chance of showers. High 25. Tuesday Night: Cloudy. Low 14. Wednesday: A mix of sun and cloud. High 21. |
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