forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Tue Oct 20 2026 |
| Tonight: Clear. Fog patches developing overnight. Low plus 1. Wednesday: A mix of sun and cloud. Becoming sunny in the morning. Fog patches dissipating in the morning. High 13. Uv index 3 or moderate. Wednesday Night: Clear. Becoming partly cloudy overnight. Fog patches developing overnight. Low zero. Thursday: Sunny. High 14. Thursday Night: Clear. Low zero. Friday: Sunny. High 11. Friday Night: Clear. Low minus 1. Saturday: Sunny. High 13. Saturday Night: Clear. Low plus 1. Sunday: A mix of sun and cloud. High 15. Sunday Night: Cloudy periods. Low 7. Monday: A mix of sun and cloud with 30 percent chance of showers. High 14. |
regional radar

■ Cornwall
Rain Snow Ice Mix














