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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Wed Jul 22 2026 |
| Tonight: Mainly cloudy with 40 percent chance of showers. Clearing before morning. Wind west 30 km/h gusting to 50 becoming light this evening. Low 10. Thursday: Sunny. Increasing cloudiness early in the afternoon. High 24. Humidex 27. Uv index 7 or high. Thursday Night: Clearing in the evening. Low 11. Friday: Sunny. High 27. Friday Night: Cloudy periods. Low 14. Saturday: A mix of sun and cloud. High 27. Saturday Night: Cloudy periods with 30 percent chance of showers. Low 17. Sunday: Cloudy with 40 percent chance of showers. High 28. Sunday Night: Cloudy with 40 percent chance of showers. Low 15. Monday: A mix of sun and cloud with 30 percent chance of showers. High 27. Monday Night: Cloudy periods with 40 percent chance of showers. Low 14. Tuesday: A mix of sun and cloud with 30 percent chance of showers. High 26. |
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