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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 0500 ET Tue Aug 18 2026 |
| Today: Mainly sunny. Fog patches dissipating this morning. High 25. Humidex 29. Uv index 7 or high. Tonight: Clear. Increasing cloudiness after midnight then 60 percent chance of showers before morning. Risk of a thunderstorm before morning. Low 18. Wednesday: Cloudy with 60 percent chance of showers and risk of a thunderstorm. High 21. Humidex 27. Uv index 3 or moderate. Wednesday Night: Cloudy periods. Low 12. Thursday: A mix of sun and cloud with 30 percent chance of showers. High 24. Thursday Night: Cloudy periods with 30 percent chance of showers. Low 10. Friday: Sunny. High 26. Friday Night: Cloudy periods. Low 16. Saturday: Cloudy. High 26. Saturday Night: Cloudy with 40 percent chance of showers. Low 16. Sunday: Cloudy with 60 percent chance of showers. High 22. Sunday Night: Cloudy with 40 percent chance of showers. Low 14. Monday: Cloudy with 40 percent chance of showers. High 21. |
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