forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Sun Aug 9 2026 |
| Tonight: Partly cloudy. Low 18. Monday: Cloudy. 40 percent chance of showers late in the morning and early afternoon with risk of a thunderstorm. High 25. Humidex 30. Uv index 6 or high. Monday Night: Mainly cloudy. 60 percent chance of showers in the evening and after midnight with risk of a thunderstorm. Low 18. Tuesday: A mix of sun and cloud. High 25. Tuesday Night: Clear. Low 12. Wednesday: A mix of sun and cloud with 30 percent chance of showers. High 25. Wednesday Night: Cloudy with 30 percent chance of showers. Low 15. Thursday: A mix of sun and cloud with 40 percent chance of showers. High 25. Thursday Night: Cloudy periods with 40 percent chance of showers. Low 15. Friday: A mix of sun and cloud. High 24. Friday Night: Clear. Low 12. Saturday: Sunny. High 25. |
regional radar

■ Cornwall
Rain Snow Ice Mix














