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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Thu Oct 22 2026 |
| Tonight: Partly cloudy. Clearing this evening. Wind up to 15 km/h. Low minus 3. Wind chill minus 5 overnight. Friday: Sunny. Wind up to 15 km/h. High 12. Wind chill minus 7 in the morning. Uv index 3 or moderate. Friday Night: Partly cloudy. Wind up to 15 km/h. Low minus 3. Wind chill minus 5 overnight. Saturday: Sunny. High 12. Saturday Night: Clear. Low minus 1. Sunday: Sunny. High 15. Sunday Night: Cloudy periods with 30 percent chance of showers. Low 6. Monday: A mix of sun and cloud with 30 percent chance of showers. High 14. Monday Night: Cloudy periods. Low plus 1. Tuesday: Sunny. High 8. Tuesday Night: Clear. Low minus 3. Wednesday: Sunny. High 9. |
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