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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1531 ET Fri Sep 18 2026 |
| Tonight: Clear. Low plus 2 with patchy frost. Saturday: Sunny. High 17. Uv index 6 or high. Saturday Night: Clear. Becoming partly cloudy overnight. Low plus 5. Sunday: A mix of sun and cloud with 30 percent chance of showers. High 19. Sunday Night: Clearing. Low 7. Monday: Cloudy. High 17. Monday Night: Cloudy periods. Low plus 5. Tuesday: Sunny. High 17. Tuesday Night: Clear. Low 6. Wednesday: A mix of sun and cloud. High 19. Wednesday Night: Cloudy periods. Low 6. Thursday: A mix of sun and cloud. High 18. |
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