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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Mon Oct 5 2026 |
| Tonight: Partly cloudy. 30 percent chance of showers early this evening. Clearing overnight. Wind west 40 km/h gusting to 60 diminishing to 20 gusting to 40 this evening. Low plus 1 with patchy frost. Tuesday: Sunny. Wind west 20 km/h gusting to 40. High 13. Uv index 4 or moderate. Tuesday Night: Clear in the evening and after midnight then partly cloudy with 30 percent chance of showers before morning. Wind west 20 km/h becoming light in the evening. Low plus 4. Wednesday: Cloudy with 40 percent chance of showers. High 19. Wednesday Night: Cloudy periods with 40 percent chance of showers. Low 10. Thursday: A mix of sun and cloud with 40 percent chance of showers. High 17. Thursday Night: Cloudy periods with 30 percent chance of showers. Low 9. Friday: A mix of sun and cloud with 40 percent chance of showers. High 14. Friday Night: Cloudy with 40 percent chance of showers. Low 6. Saturday: A mix of sun and cloud with 30 percent chance of showers. High 14. Saturday Night: Cloudy periods. Low 6. Sunday: A mix of sun and cloud. High 19. |
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