forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Wed Aug 5 2026 |
| Tonight: A few clouds. Increasing cloudiness after midnight. Fog patches developing overnight. Wind west 20 km/h becoming light early this evening. Low 17. Thursday: Mainly cloudy. 60 percent chance of showers in the afternoon with risk of a thunderstorm. Fog patches dissipating in the morning. High 28. Humidex 36. Uv index 8 or very high. Thursday Night: Partly cloudy. 60 percent chance of showers in the evening with risk of a thunderstorm. Low 19. Friday: Cloudy with 40 percent chance of showers. High 28. Friday Night: Cloudy with 40 percent chance of showers. Low 18. Saturday: Cloudy with 60 percent chance of showers. High 26. Saturday Night: Cloudy with 60 percent chance of showers. Low 17. Sunday: Clearing. High 26. Sunday Night: Cloudy periods with 30 percent chance of showers. Low 16. Monday: A mix of sun and cloud with 60 percent chance of showers. High 26. Monday Night: Cloudy with 30 percent chance of showers. Low 16. Tuesday: Cloudy. High 25. |
regional radar

■ Cornwall
Rain Snow Ice Mix













