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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Mon Aug 24 2026 |
| Tonight: A few showers ending near midnight then cloudy with 30 percent chance of showers. Risk of a thunderstorm this evening. Wind southwest 20 km/h gusting to 40. Low 14. Tuesday: Cloudy with 40 percent chance of showers. Wind west 30 km/h becoming light late in the afternoon. High 23. Humidex 28. Uv index 4 or moderate. Tuesday Night: Mainly cloudy. 40 percent chance of showers in the evening. Fog patches developing after midnight. Low 11. Wednesday: A mix of sun and cloud. High 25. Wednesday Night: Cloudy periods. Low 17. Thursday: Cloudy with 40 percent chance of showers. High 25. Thursday Night: Cloudy with 30 percent chance of showers. Low 17. Friday: A mix of sun and cloud with 30 percent chance of showers. High 23. Friday Night: Cloudy periods with 30 percent chance of showers. Low 11. Saturday: A mix of sun and cloud. High 23. Saturday Night: Cloudy periods. Low 14. Sunday: Cloudy with 30 percent chance of showers. High 24. |
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