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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Sun Jul 5 2026 |
| Today: Sunny. High 26. Humidex 29. Uv index 9 or very high. Tonight: Partly cloudy. Low 18. Monday: Mainly cloudy. Clearing late in the afternoon. Wind northeast 30 km/h becoming light late in the afternoon. High 26. Humidex 31. Uv index 8 or very high. Monday Night: Clear. Low 16. Tuesday: Sunny. High 29. Tuesday Night: Clear. Low 17. Wednesday: A mix of sun and cloud with 30 percent chance of showers. High 29. Wednesday Night: Clear. Low 19. Thursday: Cloudy with 40 percent chance of showers. High 29. Thursday Night: Cloudy with 40 percent chance of showers. Low 17. Friday: Cloudy with 30 percent chance of showers. High 28. Friday Night: Clear. Low 15. Saturday: Sunny. High 28. |
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