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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Wed Aug 12 2026 |
| Today: Mainly cloudy. 60 percent chance of showers this afternoon with risk of a thunderstorm. Wind west 30 km/h. 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 periods with 40 percent chance of showers. Low 14. Friday: Sunny. High 24. Friday Night: Clear. Low 11. Saturday: Sunny. High 24. Saturday Night: Clear. Low 11. Sunday: Sunny. High 26. Sunday Night: Cloudy with 40 percent chance of showers. Low 16. Monday: A mix of sun and cloud with 30 percent chance of showers. High 25. Monday Night: Cloudy periods. Low 15. Tuesday: A mix of sun and cloud. High 26. |
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