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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Thu Oct 29 2026 |
| Tonight: Mainly cloudy. 60 percent chance of showers this evening. Wind southwest 30 km/h gusting to 50 becoming light after midnight. Low 8. Friday: Cloudy. Wind becoming west 20 km/h gusting to 40 in the morning. High 11. Uv index 1 or low. Friday Night: Cloudy. Wind northwest 30 km/h becoming light in the evening. Low minus 2. Saturday: Sunny. High 8. Saturday Night: Clear. Low minus 2. Sunday: Sunny. High 13. Sunday Night: Increasing cloudiness. Low plus 5. Monday: A mix of sun and cloud. High 15. Monday Night: Cloudy. Low 7. Tuesday: Cloudy with 30 percent chance of showers. High 12. Tuesday Night: Cloudy with 30 percent chance of showers. Low 8. Wednesday: Cloudy with 30 percent chance of showers. High 13. |
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