forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Fri Sep 11 2026 |
| Tonight: Clear. Fog patches developing near midnight. Low 8. Saturday: Sunny. Fog patches dissipating early in the morning. High 26. Humidex 31. Uv index 6 or high. Saturday Night: Increasing cloudiness. 40 percent chance of showers overnight with risk of thunderstorms. Low 18. Sunday: Cloudy with 40 percent chance of showers. High 24. Sunday Night: Cloudy periods with 40 percent chance of showers. Low 10. Monday: Sunny. High 19. Monday Night: Clear. Low 8. Tuesday: Cloudy with 60 percent chance of showers. High 23. Tuesday Night: Cloudy with 60 percent chance of showers. Low 15. Wednesday: Cloudy with 30 percent chance of showers. High 22. Wednesday Night: Cloudy. Low 13. Thursday: Cloudy. High 22. |
regional radar

■ Cornwall
Rain Snow Ice Mix














