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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Sat Aug 22 2026 |
| Today: Increasing cloudiness near noon. High 26. Humidex 29. Uv index 7 or high. Tonight: Partly cloudy. 40 percent chance of showers after midnight. Showers beginning overnight. Risk of a thunderstorm overnight. Local amount 5 mm. Low 18. Sunday: Showers with risk of a thunderstorm. Local amount 5 to 10 mm. High 22. Humidex 27. Uv index 3 or moderate. Sunday Night: Cloudy with 60 percent chance of showers. Low 14. Monday: Cloudy with 60 percent chance of showers. High 20. Monday Night: Cloudy with 40 percent chance of showers. Low 14. Tuesday: Cloudy with 30 percent chance of showers. High 22. Tuesday Night: Cloudy periods. Low 13. Wednesday: A mix of sun and cloud. High 26. Wednesday Night: Cloudy periods with 30 percent chance of showers. Low 15. Thursday: Cloudy with 30 percent chance of showers. High 25. Thursday Night: Cloudy with 30 percent chance of showers. Low 17. Friday: Cloudy with 30 percent chance of showers. High 24. |
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