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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 2321 ET Mon Aug 31 2026 |
| Tonight: Cloudy with 40 percent chance of showers. Low 15. Tuesday: Showers with thunderstorms. Wind east 20 km/h becoming light late in the morning. High 23. Humidex 31. Uv index 3 or moderate. Tuesday Night: Cloudy. 40 percent chance of showers in the evening with risk of a thunderstorm. Low 17. Wednesday: A mix of sun and cloud with 60 percent chance of showers. High 25. Wednesday Night: Cloudy with 60 percent chance of showers. Low 15. Thursday: Cloudy with 40 percent chance of showers. High 23. Thursday Night: Cloudy with 30 percent chance of showers. Low 15. Friday: A mix of sun and cloud with 30 percent chance of showers. High 23. Friday Night: Cloudy periods. Low 15. Saturday: A mix of sun and cloud. High 22. Saturday Night: Cloudy periods. Low 14. Sunday: Cloudy. High 23. |
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