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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1601 ET Mon Jul 13 2026 |
| Tonight: Partly cloudy. 60 percent chance of showers early this evening with risk of a thunderstorm. Wind becoming southwest 30 km/h gusting to 50 this evening. Low 21. Tuesday: Sunny early in the morning then a mix of sun and cloud with 30 percent chance of showers late in the afternoon. Risk of thunderstorms late in the afternoon. Wind southwest 30 km/h gusting to 50. High 34. Humidex 42. Uv index 9 or very high. Tuesday Night: Cloudy with 30 percent chance of showers and risk of thunderstorms. Low 18. Wednesday: Sunny. High 30. Wednesday Night: Clear. Low 15. Thursday: A mix of sun and cloud with 30 percent chance of showers. High 29. Thursday Night: Clear. Low 14. Friday: A mix of sun and cloud. High 25. Friday Night: Cloudy periods. Low 14. Saturday: A mix of sun and cloud with 30 percent chance of showers. High 25. Saturday Night: Cloudy periods. Low 14. Sunday: A mix of sun and cloud with 30 percent chance of showers. High 27. |
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