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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Thu Jul 2 2026 |
| Today: A mix of sun and cloud. 40 percent chance of showers this afternoon with risk of a thunderstorm. Wind southwest 30 km/h gusting to 50. High 34. Humidex 45. Uv index 9 or very high. Tonight: Partly cloudy with 40 percent chance of showers this evening and risk of a thunderstorm. Clearing late this evening. Wind west 30 km/h gusting to 50 becoming light this evening. Wind becoming southwest 20 before morning. Low 22. Friday: Sunny in the morning and early in the afternoon then a mix of sun and cloud with 40 percent chance of showers in the afternoon. Risk of a thunderstorm in the afternoon. Wind west 30 km/h gusting to 50. High 32. Humidex 40. Uv index 10 or very high. Friday Night: Cloudy. Low 20. Saturday: Sunny. High 27. 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 26. Monday Night: Cloudy periods. Low 17. Tuesday: A mix of sun and cloud. High 28. Tuesday Night: Cloudy periods. Low 18. Wednesday: Cloudy. High 28. |
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