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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Tue Oct 27 2026 |
| Tonight: Clear. Increasing cloudiness overnight. Wind up to 15 km/h. Low minus 4. Wind chill minus 7 overnight. Wednesday: Cloudy. Wind up to 15 km/h. High 10. Wind chill minus 5 in the morning. Uv index 2 or low. Wednesday Night: Clearing in the evening. Low plus 2. Thursday: A mix of sun and cloud with 30 percent chance of showers. High 18. Thursday Night: Cloudy with 40 percent chance of showers. Low 10. Friday: Sunny. High 13. Friday Night: Clear. Low plus 2. Saturday: Sunny. High 11. Saturday Night: Increasing cloudiness. Low plus 3. Sunday: Cloudy. High 12. Sunday Night: Cloudy. Low 8. Monday: Cloudy with 30 percent chance of showers. High 12. |
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