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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Fri Aug 28 2026 |
| Tonight: Partly cloudy. Clearing this evening. Fog patches developing overnight. Low 9. Saturday: Sunny. Fog patches dissipating in the morning. Wind becoming southwest 20 km/h gusting to 40 late in the morning. High 25. Humidex 28. Uv index 7 or high. Saturday Night: Mainly cloudy. 40 percent chance of showers overnight. Wind southwest 30 km/h gusting to 50 becoming northwest 20 then light near midnight. Low 15. Sunday: A mix of sun and cloud with 60 percent chance of showers. High 24. Sunday Night: Cloudy periods. Low 16. Monday: Cloudy with 40 percent chance of showers. High 25. Monday Night: Cloudy with 40 percent chance of showers. Low 15. Tuesday: Cloudy with 60 percent chance of showers. High 25. Tuesday Night: Cloudy with 60 percent chance of showers. Low 15. Wednesday: A mix of sun and cloud with 30 percent chance of showers. High 25. Wednesday Night: Cloudy periods. Low 15. Thursday: Cloudy with 40 percent chance of showers. High 22. |
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