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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1703 ET Sun Aug 30 2026 |
| Tonight: Mainly cloudy. 60 percent chance of showers early this evening with risk of a thunderstorm. Fog patches developing overnight. Low 12. Monday: Cloudy. Clearing near noon. Fog patches dissipating in the morning. High 24. Humidex 30. Uv index 7 or high. Monday Night: Cloudy. Showers beginning in the evening. 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 60 percent chance of showers. High 25. Wednesday Night: Cloudy 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: A mix of sun and cloud with 30 percent chance of showers. High 23. Friday Night: Cloudy periods. Low 15. Saturday: A mix of sun and cloud. High 22. |
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