forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 0500 ET Tue Oct 20 2026 |
| Today: Sunny. Fog patches dissipating this morning. Wind becoming northeast 20 km/h this morning. High 15. Uv index 3 or moderate. Tonight: Clear. Becoming partly cloudy before morning. Fog patches developing overnight. Low plus 1. Wednesday: Clearing. Fog patches dissipating in the morning. High 13. Uv index 3 or moderate. Wednesday Night: Clear. Low minus 1. Thursday: Sunny. High 14. Thursday Night: Clear. Low minus 1. Friday: Sunny. High 11. Friday Night: Clear. Low zero. Saturday: Sunny. High 13. Saturday Night: Clear. Low plus 2. Sunday: A mix of sun and cloud. High 16. Sunday Night: Cloudy periods. Low 7. Monday: A mix of sun and cloud. High 14. |
regional radar

■ Cornwall
Rain Snow Ice Mix














