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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1835 ET Thu Aug 27 2026 |
| Tonight: Cloudy with 40 percent chance of showers. Risk of a thunderstorm this evening. Wind southwest 30 km/h becoming light this evening. Low 14. Friday: Mainly cloudy. 30 percent chance of showers in the morning. High 22. Humidex 25. Uv index 5 or moderate. Friday Night: Clearing in the evening. Fog patches developing overnight. Low 8. Saturday: Sunny. High 25. Saturday Night: Cloudy periods. Low 15. Sunday: A mix of sun and cloud with 60 percent chance of showers. High 25. Sunday Night: Cloudy periods. Low 16. Monday: Cloudy with 40 percent chance of showers. High 26. Monday Night: Cloudy with 40 percent chance of showers. Low 15. Tuesday: Cloudy with 60 percent chance of showers. High 25. Tuesday Night: Cloudy with 60 percent chance of showers. Low 15. Wednesday: A mix of sun and cloud with 30 percent chance of showers. High 25. |
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