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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 0500 ET Mon Aug 10 2026 |
| Today: A mix of sun and cloud with 40 percent chance of showers and risk of a thunderstorm. High 25. Humidex 30. Uv index 8 or very high. Tonight: Cloudy. 40 percent chance of showers this evening with risk of a thunderstorm. Low 17. Tuesday: A mix of sun and cloud. Wind becoming northwest 20 km/h near noon. High 25. Humidex 30. Uv index 7 or high. Tuesday Night: Clear. Low 12. Wednesday: A mix of sun and cloud with 30 percent chance of showers. High 25. Wednesday Night: Cloudy with 30 percent chance of showers. Low 15. Thursday: A mix of sun and cloud with 40 percent chance of showers. High 25. Thursday Night: Cloudy periods with 40 percent chance of showers. Low 15. Friday: A mix of sun and cloud. High 24. Friday Night: Clear. Low 12. Saturday: Sunny. High 25. Saturday Night: Clear. Low 12. Sunday: A mix of sun and cloud. High 24. |
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