forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Mon Oct 19 2026 |
| Tonight: Clear. Wind southwest 20 km/h becoming light early this evening. Low plus 2. Tuesday: Sunny. Wind northeast 20 km/h becoming light in the afternoon. High 15. Uv index 3 or moderate. Tuesday Night: Clear. Fog patches developing overnight. Low plus 1. Wednesday: Sunny. High 14. 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. |
regional radar

■ Cornwall
Rain Snow Ice Mix














