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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Sun Sep 27 2026 |
| Tonight: Cloudy. 40 percent chance of showers this evening and after midnight. Wind northeast 30 km/h gusting to 50 becoming light early this evening. Low 12. Monday: Mainly cloudy. 40 percent chance of showers late in the afternoon. High 19. Uv index 4 or moderate. Monday Night: Partly cloudy. 40 percent chance of showers in the evening. Low 8. Tuesday: A mix of sun and cloud. High 21. Tuesday Night: Cloudy periods. Low 11. Wednesday: A mix of sun and cloud. High 22. Wednesday Night: Cloudy periods. Low 14. Thursday: Cloudy with 30 percent chance of showers. High 23. Thursday Night: Cloudy with 30 percent chance of showers. Low 15. Friday: Cloudy. High 20. Friday Night: Cloudy periods. Low 7. Saturday: A mix of sun and cloud. High 18. |
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