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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1712 ET Tue Sep 1 2026 |
| Tonight: Partly cloudy. 30 percent chance of showers early this evening with risk of a thunderstorm. Fog patches developing overnight. Wind east 20 km/h becoming light this evening. Low 19. Wednesday: Mainly cloudy. 40 percent chance of showers in the afternoon with risk of a thunderstorm. Fog patches dissipating in the morning. Wind becoming southeast 20 km/h gusting to 40 in the afternoon. High 27. Humidex 35. Uv index 6 or high. Wednesday Night: Showers ending before morning then mainly cloudy with 40 percent chance of showers. Risk of a thunderstorm in the evening and overnight. Local amount 15 to 25 mm. Wind south 20 km/h becoming north 20 gusting to 40 then light near midnight. Low 20. Thursday: Cloudy with 40 percent chance of showers. High 25. Thursday Night: Cloudy periods with 30 percent chance of showers. Low 16. Friday: A mix of sun and cloud with 30 percent chance of showers. High 25. Friday Night: Cloudy periods. Low 15. Saturday: A mix of sun and cloud with 30 percent chance of showers. High 23. Saturday Night: Cloudy periods. Low 13. Sunday: A mix of sun and cloud. High 24. Sunday Night: Cloudy periods. Low 13. Monday: A mix of sun and cloud. High 23. |
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