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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1851 ET Fri Oct 30 2026 |
| Tonight: Mainly cloudy. Wind northwest 30 km/h becoming light this evening. Low minus 2. Wind chill minus 5 overnight. Saturday: Mainly cloudy. Wind becoming west 20 km/h in the afternoon. High 9. Wind chill minus 6 in the morning. Uv index 2 or low. Saturday Night: Clearing late in the evening. Fog patches developing overnight. Wind up to 15 km/h. Low minus 3. Wind chill minus 7 overnight. Sunday: Sunny. High 14. Sunday Night: Cloudy periods. Low 8. Monday: Cloudy. High 16. Monday Night: Cloudy. Low 6. Tuesday: Cloudy. High 16. Tuesday Night: Cloudy. Low 8. Wednesday: Cloudy. High 17. Wednesday Night: Cloudy with 30 percent chance of showers. Low 9. Thursday: Cloudy with 60 percent chance of showers. High 15. |
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