forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 0500 ET Sat Sep 5 2026 |
| Today: Increasing cloudiness early this morning. 40 percent chance of showers this afternoon. Wind becoming northeast 30 km/h this afternoon. High 23. Humidex 27. Uv index 4 or moderate. Tonight: Mainly cloudy. 30 percent chance of showers early this evening. Fog patches developing overnight. Wind northeast 20 km/h becoming light this evening. Low 12. Sunday: Clearing. Fog patches dissipating in the morning. High 23. Humidex 26. Uv index 6 or high. Sunday Night: Clear. Low 9. Monday: Sunny. High 26. Monday Night: Clear. Low 11. Tuesday: A mix of sun and cloud. High 23. Tuesday Night: Cloudy with 30 percent chance of showers. Low 12. Wednesday: Cloudy with 60 percent chance of showers. High 22. Wednesday Night: Cloudy with 60 percent chance of showers. Low 17. Thursday: A mix of sun and cloud. High 22. Thursday Night: Cloudy periods. Low 9. Friday: A mix of sun and cloud. High 20. |
regional radar

■ Cornwall
Rain Snow Ice Mix














