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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 0500 ET Wed Aug 12 2026 |
| Today: Sunny early this morning then a mix of sun and cloud with 40 percent chance of showers this afternoon. Risk of a thunderstorm this afternoon. Wind becoming west 30 km/h near noon. High 25. Humidex 30. Uv index 7 or high. Tonight: Mainly cloudy. 40 percent chance of showers this evening with risk of a thunderstorm. Fog patches developing near midnight. Low 14. Thursday: Becoming a mix of sun and cloud in the morning with 40 percent chance of showers in the afternoon. Risk of a thunderstorm in the afternoon. Fog patches dissipating in the morning. Wind becoming west 20 km/h in the afternoon. High 24. Humidex 29. Uv index 6 or high. Thursday Night: Cloudy with 40 percent chance of showers. Low 13. Friday: Clearing. High 22. Friday Night: Clear. Low 8. Saturday: Sunny. High 24. Saturday Night: Clear. Low 13. Sunday: A mix of sun and cloud. High 22. Sunday Night: Cloudy with 40 percent chance of showers. Low 16. Monday: Cloudy with 30 percent chance of showers. High 24. Monday Night: Cloudy periods. Low 15. Tuesday: A mix of sun and cloud. High 26. |
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