forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1726 ET Sat Sep 19 2026 |
| Tonight: Partly cloudy. Low plus 3 with risk of frost. Sunday: A mix of sun and cloud. 30 percent chance of showers in the morning and early in the afternoon. High 17. Uv index 6 or high. Sunday Night: Partly cloudy. Low plus 5. Monday: Cloudy. High 16. Monday Night: Cloudy. Low 8. Tuesday: Clearing. High 16. Tuesday Night: Clear. Low plus 5. Wednesday: Sunny. High 18. Wednesday Night: Clear. Low 6. Thursday: Sunny. High 19. Thursday Night: Clear. Low 9. Friday: A mix of sun and cloud. High 20. |
regional radar

■ Cornwall
Rain Snow Ice Mix














