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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1829 ET Fri Oct 23 2026 |
| Tonight: Partly cloudy. Clearing near midnight. Wind up to 15 km/h. Low minus 3. Wind chill minus 5 overnight. Saturday: Sunny. Wind up to 15 km/h. High 13. Wind chill minus 5 in the morning. Uv index 3 or moderate. Saturday Night: Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 6 overnight. Sunday: Sunny. High 16. Sunday Night: Cloudy periods. Low 7. Monday: A mix of sun and cloud with 30 percent chance of showers. High 12. Monday Night: Clear. Low minus 4. Tuesday: Sunny. High 7. Tuesday Night: Clear. Low minus 6. Wednesday: A mix of sun and cloud. High 9. Wednesday Night: Cloudy periods. Low plus 1. Thursday: Cloudy. High 14. |
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