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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Sun Aug 16 2026 |
| Tonight: Cloudy. A few showers beginning late this evening. Risk of a thunderstorm late this evening and overnight. Low 18. Monday: Cloudy with 40 percent chance of showers. High 25. Humidex 33. Uv index 4 or moderate. Monday Night: Mainly cloudy. 30 percent chance of showers in the evening. Fog patches developing after midnight. Low 13. Tuesday: Sunny. High 26. Tuesday Night: Cloudy periods with 30 percent chance of showers. Low 19. Wednesday: Cloudy with 60 percent chance of showers. High 22. Wednesday Night: Clear. Low 13. Thursday: A mix of sun and cloud with 30 percent chance of showers. High 24. Thursday Night: Cloudy periods with 30 percent chance of showers. Low 12. Friday: A mix of sun and cloud. High 25. Friday Night: Cloudy periods. Low 14. Saturday: Cloudy. High 23. |
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