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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Thu Aug 13 2026 |
| Today: A mix of sun and cloud. 40 percent chance of showers this afternoon with risk of a thunderstorm. Wind becoming northwest 20 km/h gusting to 40 this afternoon. High 25. Humidex 30. Uv index 7 or high. Tonight: Partly cloudy with 40 percent chance of showers early this evening and risk of a thunderstorm. Clearing late this evening. Low 13. Friday: A mix of sun and cloud. 40 percent chance of showers in the afternoon with risk of a thunderstorm. High 24. Humidex 26. Uv index 6 or high. Friday Night: Clear. Low 10. Saturday: Sunny. High 25. Saturday Night: Clear. Low 10. Sunday: Cloudy with 40 percent chance of showers. High 25. Sunday Night: Cloudy with 60 percent chance of showers. Low 17. Monday: Cloudy with 30 percent chance of showers. High 25. Monday Night: Clear. Low 15. Tuesday: A mix of sun and cloud. High 26. Tuesday Night: Cloudy periods. Low 16. Wednesday: A mix of sun and cloud with 30 percent chance of showers. High 24. |
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