forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Fri Jun 19 2026 |
| Today: Cloudy with 60 percent chance of showers and risk of a thunderstorm. Wind west 30 km/h gusting to 50. High 20. Humidex 25. Uv index 6 or high. Tonight: Cloudy. 60 percent chance of showers this evening and after midnight. Risk of a thunderstorm early this evening. Wind west 30 km/h gusting to 50. Low 15. Saturday: Cloudy. 60 percent chance of showers in the afternoon with risk of a thunderstorm. Wind west 20 km/h gusting to 40. High 20. Humidex 25. Uv index 5 or moderate. Saturday Night: Cloudy with 40 percent chance of showers. Low 14. Sunday: Cloudy with 40 percent chance of showers. High 23. Sunday Night: Cloudy periods with 30 percent chance of showers. Low 13. Monday: Cloudy with 40 percent chance of showers. High 21. Monday Night: Cloudy with 40 percent chance of showers. Low 15. Tuesday: Cloudy with 30 percent chance of showers. High 23. Tuesday Night: Cloudy periods. Low 14. Wednesday: A mix of sun and cloud. High 25. Wednesday Night: Cloudy. Low 14. Thursday: Cloudy with 40 percent chance of showers. High 22. |
regional radar

Cornwall
Rain Snow Ice Mix














