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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1828 ET Sat Aug 8 2026 |
| Tonight: Mainly cloudy. 40 percent chance of showers this evening. Risk of a thunderstorm early this evening. Low 19. Sunday: A mix of sun and cloud. Clearing late in the afternoon. High 28. Humidex 35. Uv index 7 or high. Sunday Night: Increasing cloudiness. Low 17. Monday: Cloudy with 60 percent chance of showers. High 26. Monday Night: Cloudy with 60 percent chance of showers. Low 17. Tuesday: A mix of sun and cloud. High 26. Tuesday Night: Clear. Low 12. Wednesday: A mix of sun and cloud with 30 percent chance of showers. High 26. Wednesday Night: Cloudy with 30 percent chance of showers. Low 16. Thursday: Cloudy with 40 percent chance of showers. High 23. Thursday Night: Cloudy with 40 percent chance of showers. Low 14. Friday: A mix of sun and cloud. High 24. |
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