forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Wed Sep 16 2026 |
| Tonight: Clearing early this evening. Low 12. Thursday: Clearing. High 24. Humidex 29. Uv index 6 or high. Thursday Night: Clear. Low 10. Friday: Sunny. High 20. Friday Night: Clear. Low 6. Saturday: Sunny. High 18. Saturday Night: Cloudy with 60 percent chance of showers. Low 10. Sunday: Cloudy with 60 percent chance of showers. High 18. Sunday Night: Clear. Low 7. Monday: A mix of sun and cloud. High 17. Monday Night: Cloudy periods. Low 8. Tuesday: A mix of sun and cloud. High 18. |
regional radar

■ Cornwall
Rain Snow Ice Mix














