forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Wed Oct 28 2026 |
| Tonight: Mainly cloudy. Clearing this evening. Low zero. Thursday: Mainly sunny. Increasing cloudiness in the afternoon then 60 percent chance of showers late in the afternoon. Wind becoming southwest 20 km/h gusting to 50 in the morning then increasing to 40 gusting to 60 in the afternoon. High 19. Uv index 3 or moderate. Thursday Night: Mainly cloudy. 60 percent chance of showers in the evening. Wind southwest 30 km/h gusting to 50. Low 8. Friday: A mix of sun and cloud. High 11. Friday Night: Cloudy periods. Low minus 2. Saturday: Sunny. High 8. Saturday Night: Clear. Low minus 1. Sunday: Sunny. High 14. Sunday Night: Cloudy periods. Low 6. Monday: A mix of sun and cloud. High 11. Monday Night: Cloudy periods. Low plus 4. Tuesday: A mix of sun and cloud with 30 percent chance of showers. High 11. |
regional radar

■ Cornwall
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