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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Sun Aug 2 2026 |
| Tonight: Rain at Times heavy with risk of a thunderstorm. Local amount 30 to 40 mm. Low 17. Monday: Periods of rain ending near noon then cloudy with 40 percent chance of showers. Wind becoming southwest 30 km/h gusting to 50 in the morning then becoming northwest 30 gusting to 50 in the afternoon. High 24. Humidex 30. Uv index 3 or moderate. Monday Night: Mainly cloudy with 30 percent chance of showers in the evening. Clearing near midnight. Wind west 20 km/h gusting to 40 becoming light after midnight. Low 13. Tuesday: Sunny. High 26. Tuesday Night: Clear. Low 16. Wednesday: Sunny. High 29. Wednesday Night: Cloudy periods. Low 19. Thursday: Cloudy with 40 percent chance of showers. High 26. Thursday Night: Cloudy with 40 percent chance of showers. Low 20. Friday: Cloudy with 30 percent chance of showers. High 26. Friday Night: Cloudy periods. Low 19. Saturday: A mix of sun and cloud with 30 percent chance of showers. High 28. |
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