forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Sun Oct 18 2026 |
| Tonight: Clear. Wind southwest 20 km/h gusting to 40 becoming light near midnight. Low plus 3. Monday: Sunny. High 17. Uv index 4 or moderate. Monday Night: Clear. Low plus 2. Tuesday: Sunny. High 16. Tuesday Night: Clear. Low zero. Wednesday: Sunny. High 13. Wednesday Night: Clear. Low minus 2. Thursday: Sunny. High 15. Thursday Night: Clear. Low zero. Friday: Sunny. High 10. Friday Night: Clear. Low minus 1. Saturday: Sunny. High 12. |
regional radar

■ Cornwall
Rain Snow Ice Mix













