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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 0500 ET Tue Aug 11 2026 |
| Today: A mix of sun and cloud. 40 percent chance of showers this afternoon with risk of a thunderstorm. Wind becoming west 20 km/h gusting to 40 late this morning. High 26. Humidex 31. Uv index 7 or high. Tonight: Partly cloudy. 40 percent chance of showers this evening with risk of a thunderstorm. Wind west 30 km/h becoming light this evening. Low 13. Wednesday: Increasing cloudiness. 30 percent chance of showers in the afternoon with risk of a thunderstorm. Wind becoming southwest 30 km/h in the afternoon. High 25. Humidex 30. Uv index 7 or high. Wednesday Night: Cloudy with 60 percent chance of showers. Low 15. Thursday: A mix of sun and cloud with 40 percent chance of showers. High 25. Thursday Night: Cloudy periods with 40 percent chance of showers. Low 15. Friday: A mix of sun and cloud. High 24. Friday Night: Clear. Low 12. Saturday: Sunny. High 25. Saturday Night: Clear. Low 12. Sunday: A mix of sun and cloud with 40 percent chance of showers. High 24. Sunday Night: Cloudy with 40 percent chance of showers. Low 15. Monday: A mix of sun and cloud with 30 percent chance of showers. High 24. |
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