forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Fri Jul 17 2026 |
| Today: Sunny. High 25. Humidex 27. Uv index 8 or very high. Tonight: Clear. Increasing cloudiness near midnight then 60 percent chance of showers before morning. Risk of a thunderstorm before morning. Low 16. Saturday: Cloudy with 60 percent chance of showers and risk of a thunderstorm. Local smoke. Wind becoming southwest 20 km/h in the morning. High 25. Humidex 32. Uv index 6 or high. Saturday Night: Cloudy with 30 percent chance of showers. Low 13. Sunday: Sunny. High 23. Sunday Night: Clear. Low 12. Monday: Sunny. High 25. Monday Night: Cloudy with 40 percent chance of showers. Low 17. Tuesday: Cloudy with 60 percent chance of showers. High 23. Tuesday Night: Cloudy with 30 percent chance of showers. Low 17. Wednesday: Cloudy with 30 percent chance of showers. High 21. Wednesday Night: Cloudy periods. Low 14. Thursday: A mix of sun and cloud. High 24. |
regional radar

■ Cornwall
Rain Snow Ice Mix















