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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Sat Aug 29 2026 |
| Tonight: Increasing cloudiness early this evening. 40 percent chance of showers overnight. Wind southwest 20 km/h gusting to 40 becoming light near midnight. Low 17. Sunday: Mainly cloudy. 60 percent chance of showers in the afternoon with risk of a thunderstorm. Wind southwest 20 km/h gusting to 40. High 23. Humidex 28. Uv index 6 or high. Sunday Night: Partly cloudy with 60 percent chance of showers. Risk of a thunderstorm in the evening. Wind west 30 km/h becoming light early in the evening. Low 15. Monday: Cloudy with 30 percent chance of showers. High 25. Monday Night: Cloudy with 60 percent chance of showers. Low 15. Tuesday: Cloudy with 60 percent chance of showers. High 24. Tuesday Night: Cloudy with 40 percent chance of showers. Low 15. Wednesday: A mix of sun and cloud with 40 percent chance of showers. High 25. Wednesday Night: Cloudy periods with 40 percent chance of showers. Low 15. Thursday: Cloudy with 40 percent chance of showers. High 23. Thursday Night: Cloudy with 30 percent chance of showers. Low 15. Friday: Cloudy with 30 percent chance of showers. High 23. |
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