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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1907 ET Fri Aug 7 2026 |
| Tonight: Partly cloudy. 30 percent chance of showers early this evening and before morning. Risk of a thunderstorm. Fog patches developing overnight. Low 20. Saturday: A mix of sun and cloud. 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. Risk of a thunderstorm in the morning and afternoon. Fog patches dissipating in the morning. Wind becoming west 30 km/h gusting to 50 late in the morning. High 29. Humidex 38. Uv index 8 or very high. Saturday Night: Partly cloudy. 70 percent chance of showers in the evening and after midnight with risk of a thunderstorm. Wind southwest 20 km/h. Low 19. Sunday: A mix of sun and cloud with 30 percent chance of showers. High 27. Sunday Night: Clear. Low 16. Monday: A mix of sun and cloud with 60 percent chance of showers. High 26. Monday Night: Cloudy with 60 percent chance of showers. Low 16. Tuesday: A mix of sun and cloud with 30 percent chance of showers. High 25. Tuesday Night: Cloudy periods with 30 percent chance of showers. Low 16. Wednesday: Cloudy. High 25. Wednesday Night: Cloudy. Low 15. Thursday: Cloudy. High 24. |
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