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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Tue Aug 4 2026 |
| Tonight: Clear. Fog patches developing after midnight. Wind southwest 30 km/h becoming light this evening. Low 13. Wednesday: Sunny. Fog patches dissipating in the morning. High 29. Humidex 34. Uv index 8 or very high. Wednesday Night: Clear in the evening then partly cloudy with 30 percent chance of showers before morning. Risk of a thunderstorm before morning. Low 16. Thursday: A mix of sun and cloud with 40 percent chance of showers. High 29. Thursday Night: Cloudy with 40 percent chance of showers. Low 21. Friday: Cloudy with 40 percent chance of showers. High 28. Friday Night: Cloudy with 40 percent chance of showers. Low 20. Saturday: A mix of sun and cloud with 40 percent chance of showers. High 28. Saturday Night: Cloudy periods with 40 percent chance of showers. Low 19. Sunday: A mix of sun and cloud with 30 percent chance of showers. High 28. Sunday Night: Cloudy. Low 18. Monday: Cloudy with 40 percent chance of showers. High 27. |
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