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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Fri Jul 3 2026 |
| Today: Increasing cloudiness near noon. 40 percent chance of showers with risk of a thunderstorm. Wind southwest 30 km/h gusting to 50. High 31. Humidex 39. Uv index 10 or very high. Tonight: Mainly cloudy with 40 percent chance of showers this evening and risk of a thunderstorm. Clearing overnight. Wind southwest 30 km/h becoming light this evening. Low 20. Saturday: A mix of sun and cloud with 30 percent chance of showers. Becoming sunny late in the afternoon. High 28. Humidex 30. Uv index 9 or very high. Saturday Night: Clear. Low 15. Sunday: A mix of sun and cloud. High 27. Sunday Night: Cloudy periods. Low 16. Monday: A mix of sun and cloud. High 27. Monday Night: Cloudy periods. Low 17. Tuesday: A mix of sun and cloud. High 28. Tuesday Night: Cloudy periods. Low 18. Wednesday: A mix of sun and cloud with 30 percent chance of showers. High 29. Wednesday Night: Cloudy periods. Low 18. Thursday: A mix of sun and cloud. High 30. |
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