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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Wed Jul 15 2026 |
| Today: A mix of sun and cloud. 30 percent chance of showers late this afternoon with risk of a thunderstorm. Local smoke. Wind northwest 20 km/h gusting to 40. High 29. Humidex 31. Uv index 8 or very high. Tonight: Partly cloudy. 30 percent chance of showers early this evening with risk of a thunderstorm. Wind northwest 20 km/h gusting to 40 becoming light this evening. Low 18. Thursday: Sunny in the morning then a mix of sun and cloud with 40 percent chance of showers in the afternoon. Risk of a thunderstorm in the afternoon. Wind becoming northwest 20 km/h near noon. High 27. Humidex 30. Uv index 8 or very high. Thursday Night: Clear. Low 14. Friday: Sunny. High 27. Friday Night: Cloudy periods. Low 14. Saturday: Cloudy with 40 percent chance of showers. High 21. Saturday Night: Cloudy with 30 percent chance of showers. Low 14. Sunday: A mix of sun and cloud with 30 percent chance of showers. High 25. Sunday Night: Cloudy periods. Low 15. Monday: Cloudy with 30 percent chance of showers. High 26. Monday Night: Cloudy with 30 percent chance of showers. Low 16. Tuesday: Cloudy with 60 percent chance of showers. High 23. |
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