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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Wed Jul 1 2026 |
| Today: A mix of sun and cloud. 40 percent chance of showers this afternoon with risk of a thunderstorm. Wind southwest 20 km/h gusting to 40. High 34. Humidex 46. Uv index 10 or very high. Tonight: Partly cloudy with 40 percent chance of showers and risk of a thunderstorm. Wind southwest 20 km/h gusting to 40 becoming light this evening. Low 23. Thursday: A mix of sun and cloud. 40 percent chance of showers in the afternoon with risk of a thunderstorm. Wind becoming southwest 20 km/h gusting to 40 near noon. High 34. Humidex 45. Uv index 10 or very high. Thursday Night: Cloudy periods with 30 percent chance of showers. Low 22. Friday: A mix of sun and cloud with 30 percent chance of showers. High 32. Friday Night: Cloudy periods. Low 21. Saturday: A mix of sun and cloud with 30 percent chance of showers. High 30. Saturday Night: Cloudy periods. Low 18. Sunday: A mix of sun and cloud. High 28. Sunday Night: Cloudy periods. Low 18. Monday: A mix of sun and cloud. High 28. Monday Night: Cloudy. Low 17. Tuesday: Cloudy. High 29. |
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