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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 2011 utc Jun 09 2026 |
| Tonight: Clear this evening and after midnight then partly cloudy with 40 percent chance of showers overnight. Risk of a thunderstorm overnight. Low 19. Wednesday: Showers with risk of a thunderstorm. Local amount 15 to 25 mm. High 23. Humidex 30. Uv index 4 or moderate. Wednesday Night: Showers ending near midnight then mainly cloudy with 40 percent chance of showers. Risk of a thunderstorm in the evening and overnight. Low 20. Thursday: Cloudy with 60 percent chance of showers. High 29. Thursday Night: Cloudy periods with 30 percent chance of showers. Low 19. Friday: Cloudy with 60 percent chance of showers. High 31. Friday Night: Cloudy with 30 percent chance of showers. Low 17. Saturday: A mix of sun and cloud. High 26. Saturday Night: Cloudy periods. Low 17. Sunday: Cloudy with 30 percent chance of showers. High 24. Sunday Night: Cloudy with 30 percent chance of showers. Low 14. Monday: Cloudy. High 22. |
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