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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 0500 ET Sun Sep 6 2026 |
| Today: A mix of sun and cloud. Fog patches dissipating early this morning. High 23. Humidex 26. Uv index 6 or high. Tonight: Partly cloudy with 30 percent chance of showers early this evening then clear. Fog patches developing after midnight. Low 10. Monday: Sunny. Fog patches dissipating in the morning. High 24. Humidex 27. Uv index 6 or high. Monday Night: Cloudy periods. Low 12. Tuesday: A mix of sun and cloud. High 21. Tuesday Night: Cloudy with 30 percent chance of showers. Low 14. Wednesday: Cloudy with 60 percent chance of showers. High 23. Wednesday Night: Cloudy with 40 percent chance of showers. Low 15. Thursday: A mix of sun and cloud with 40 percent chance of showers. High 20. Thursday Night: Cloudy periods. Low 7. Friday: A mix of sun and cloud with 30 percent chance of showers. High 19. Friday Night: Cloudy periods with 30 percent chance of showers. Low 8. Saturday: A mix of sun and cloud with 30 percent chance of showers. High 21. |
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