forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Fri Sep 4 2026 |
| Tonight: Mainly cloudy. 40 percent chance of showers early this evening. Low 14. Saturday: Cloudy. 40 percent chance of showers in the afternoon with risk of a thunderstorm. High 23. Humidex 27. Uv index 4 or moderate. Saturday Night: Cloudy. Fog patches developing overnight. Low 12. Sunday: Sunny. High 24. Sunday Night: Clear. Low 9. Monday: Sunny. High 26. Monday Night: Clear. Low 11. Tuesday: A mix of sun and cloud. High 23. Tuesday Night: Cloudy with 30 percent chance of showers. Low 12. Wednesday: Cloudy with 60 percent chance of showers. High 22. Wednesday Night: Cloudy with 60 percent chance of showers. Low 17. Thursday: A mix of sun and cloud. High 22. |
regional radar

■ Cornwall
Rain Snow Ice Mix













