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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Wed Sep 23 2026 |
| Tonight: Clear. Wind northeast 30 km/h becoming light early this evening. Low plus 4. Thursday: Sunny. High 19. Uv index 5 or moderate. Thursday Night: Clear. Low plus 4. Friday: Sunny. High 22. Friday Night: Clear. Low 10. Saturday: A mix of sun and cloud. High 22. Saturday Night: Cloudy periods. Low 9. Sunday: A mix of sun and cloud. High 22. Sunday Night: Cloudy periods. Low 11. Monday: A mix of sun and cloud. High 22. Monday Night: Cloudy periods. Low 11. Tuesday: A mix of sun and cloud. High 23. |
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