forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Fri Sep 25 2026 |
| Tonight: Clear. Wind northeast 20 km/h becoming light this evening. Low 6. Saturday: A mix of sun and cloud. High 24. Humidex 25. Uv index 5 or moderate. Saturday Night: Partly cloudy. Low 11. Sunday: Cloudy. High 20. Sunday Night: Cloudy with 30 percent chance of showers. Low 12. Monday: Cloudy. High 20. Monday Night: Cloudy. Low 9. Tuesday: A mix of sun and cloud. High 20. Tuesday Night: Cloudy periods. Low 10. Wednesday: A mix of sun and cloud. High 23. Wednesday Night: Cloudy with 30 percent chance of showers. Low 13. Thursday: Cloudy with 60 percent chance of showers. High 19. |
regional radar

■ Cornwall
Rain Snow Ice Mix














