forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Tue Sep 22 2026 |
| Tonight: Clear. Wind northeast 20 km/h becoming light early this evening. Low plus 3 with risk of frost. Wednesday: Sunny. High 18. Uv index 5 or moderate. Wednesday Night: Clear. Low plus 4. Thursday: Sunny. High 19. Thursday Night: Clear. Low plus 3. Friday: A mix of sun and cloud. High 21. Friday Night: Cloudy. Low 11. Saturday: Cloudy. High 22. Saturday Night: Clear. Low 9. Sunday: Sunny. High 21. Sunday Night: Clear. Low 11. Monday: Sunny. High 22. |
regional radar

■ Cornwall
Rain Snow Ice Mix














