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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1500 utc Jun 10 2026 |
| Today: Showers with risk of a thunderstorm. Local amount 15 to 25 mm. High 23. Humidex 30. Uv index 4 or moderate. Tonight: Showers ending near midnight then mainly cloudy with 40 percent chance of showers. Risk of a thunderstorm this evening and overnight. Temperature steady near 20. Thursday: Mainly cloudy. 40 percent chance of showers in the afternoon with risk of a thunderstorm. High 28. Humidex 36. Uv index 9 or very high. Thursday Night: Cloudy with 40 percent chance of showers. Low 19. Friday: Cloudy with 60 percent chance of showers. High 31. Friday Night: Cloudy with 40 percent chance of showers. Low 17. Saturday: Sunny. High 26. Saturday Night: Cloudy periods with 30 percent chance of showers. Low 17. Sunday: Cloudy with 40 percent chance of showers. High 24. Sunday Night: Cloudy. Low 14. Monday: A mix of sun and cloud. High 22. Monday Night: Cloudy periods. Low 13. Tuesday: A mix of sun and cloud with 30 percent chance of showers. High 24. |
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