forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Mon Sep 21 2026 |
| Tonight: Partly cloudy. Becoming clear overnight. Low plus 4. Tuesday: Mainly sunny. High 16. Uv index 5 or moderate. Tuesday Night: Clear. Low plus 4. Wednesday: Sunny. High 19. Wednesday Night: Clear. Low 6. Thursday: Sunny. High 19. Thursday Night: Clear. Low plus 3. Friday: Sunny. High 20. Friday Night: Clear. Low 9. Saturday: A mix of sun and cloud. High 20. Saturday Night: Cloudy periods. Low 10. Sunday: A mix of sun and cloud. High 19. |
regional radar

■ Cornwall
Rain Snow Ice Mix














