forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Sun Sep 20 2026 |
| Tonight: Partly cloudy. 30 percent chance of showers this evening. Wind north 20 km/h becoming light after midnight. Low plus 4 with risk of frost. Monday: A mix of sun and cloud. High 16. Uv index 6 or high. Monday Night: Partly cloudy. Becoming clear after midnight. Low plus 5. Tuesday: Sunny. High 17. Tuesday Night: Clear. Low plus 5. Wednesday: Sunny. High 19. Wednesday Night: Clear. Low plus 5. Thursday: Sunny. High 20. Thursday Night: Clear. Low 6. Friday: A mix of sun and cloud. High 19. Friday Night: Cloudy periods. Low 8. Saturday: A mix of sun and cloud. High 21. |
regional radar

■ Cornwall
Rain Snow Ice Mix














