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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Tue Jun 30 2026 |
| Today: A mix of sun and cloud with 40 percent chance of showers. Risk of a thunderstorm this afternoon. High 30. Humidex 38. Uv index 9 or very high. Tonight: Partly cloudy with 40 percent chance of showers and risk of a thunderstorm. Low 22. Wednesday: 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 9 or very high. Wednesday Night: Clear. Low 22. Thursday: A mix of sun and cloud with 40 percent chance of showers. High 33. 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. |
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