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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Fri Jul 24 2026 |
| Tonight: Clear. Low 13. Saturday: Sunny. High 29. Humidex 34. Uv index 8 or very high. Saturday Night: Partly cloudy. 30 percent chance of showers overnight. Low 17. Sunday: A mix of sun and cloud with 40 percent chance of showers. High 28. Sunday Night: Cloudy periods. Low 18. Monday: Cloudy with 60 percent chance of showers. High 28. Monday Night: Cloudy with 40 percent chance of showers. Low 19. Tuesday: Cloudy with 60 percent chance of showers. High 25. Tuesday Night: Cloudy with 40 percent chance of showers. Low 17. Wednesday: Cloudy with 30 percent chance of showers. High 25. Wednesday Night: Cloudy periods. Low 17. Thursday: A mix of sun and cloud. High 27. |
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