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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1500 utc Jun 18 2026 |
| Today: Showers with risk of a thunderstorm. Local amount 15 to 25 mm. Wind southwest 40 km/h gusting to 70. High 22. Humidex 27. Uv index 3 or moderate. Tonight: Cloudy with 60 percent chance of showers. Risk of a thunderstorm early this evening. Wind southwest 30 km/h gusting to 50. Low 15. Friday: Cloudy. 60 percent chance of showers in the afternoon with risk of a thunderstorm. Wind west 30 km/h gusting to 50. High 20. Humidex 25. Uv index 6 or high. Friday Night: Cloudy with 40 percent chance of showers. Low 13. Saturday: Cloudy with 40 percent chance of showers. High 19. Saturday Night: Cloudy with 40 percent chance of showers. Low 13. Sunday: Cloudy with 30 percent chance of showers. High 23. Sunday Night: Cloudy periods with 30 percent chance of showers. Low 13. Monday: Cloudy with 40 percent chance of showers. High 21. Monday Night: Cloudy with 60 percent chance of rain. Low 14. Tuesday: A mix of sun and cloud with 40 percent chance of showers. High 24. Tuesday Night: Cloudy periods. Low 14. Wednesday: A mix of sun and cloud. High 25. |
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