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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Wed Jul 29 2026 |
| Tonight: Showers. Risk of a thunderstorm early this evening. Wind north 20 km/h gusting to 40 becoming light early this evening. Low 18. Thursday: Mainly cloudy with 60 percent chance of showers. Risk of a thunderstorm in the afternoon. Wind becoming north 20 km/h near noon. High 25. Humidex 32. Uv index 6 or high. Thursday Night: Partly cloudy with 40 percent chance of showers. Fog patches overnight. Low 18. Friday: A mix of sun and cloud with 30 percent chance of showers. High 27. Friday Night: Cloudy periods with 30 percent chance of showers. Low 19. Saturday: Cloudy with 60 percent chance of showers. High 25. Saturday Night: Cloudy with 40 percent chance of showers. Low 20. Sunday: Cloudy with 40 percent chance of showers. High 24. Sunday Night: Cloudy. Low 18. Monday: A mix of sun and cloud. High 26. Monday Night: Clear. Low 17. Tuesday: Sunny. High 29. |
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