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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Sat Jun 20 2026 |
| Today: Cloudy. 60 percent chance of showers with risk of a thunderstorm. Wind west 20 km/h gusting to 40. High 22. Humidex 27. Uv index 6 or high. Tonight: Mainly cloudy with 60 percent chance of showers and risk of a thunderstorm. Wind southwest 20 km/h gusting to 40 becoming light late this evening. Low 14. Sunday: Mainly cloudy with 60 percent chance of showers. Risk of a thunderstorm in the afternoon. Wind becoming southwest 30 km/h late in the morning. High 23. Humidex 27. Uv index 7 or high. Sunday Night: Cloudy periods with 30 percent chance of showers. Low 13. Monday: Cloudy with 40 percent chance of showers. High 22. Monday Night: Cloudy with 40 percent chance of showers. Low 15. Tuesday: Cloudy with 30 percent chance of showers. High 24. Tuesday Night: Cloudy periods. Low 14. Wednesday: A mix of sun and cloud. High 25. Wednesday Night: Cloudy. Low 14. Thursday: Cloudy with 40 percent chance of showers. High 24. Thursday Night: Cloudy with 30 percent chance of showers. Low 14. Friday: Cloudy with 40 percent chance of showers. High 22. |
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