forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Sun Oct 4 2026 |
| Tonight: Cloudy. 70 percent chance of showers changing to 30 percent chance of showers this evening. Wind southwest 20 km/h gusting to 40 becoming light this evening. Low 8. Monday: Mainly cloudy with 30 percent chance of showers in the morning and early in the afternoon. Clearing late in the afternoon. Wind becoming west 30 km/h gusting to 50 late in the morning. High 13. Uv index 3 or moderate. Monday Night: Partly cloudy. Clearing near midnight. Wind west 30 km/h gusting to 50. Low plus 1 with patchy frost. Tuesday: Sunny. High 12. Tuesday Night: Increasing cloudiness. Low plus 2. Wednesday: Cloudy with 40 percent chance of showers. High 17. Wednesday Night: Cloudy with 40 percent chance of showers. Low 6. Thursday: A mix of sun and cloud with 40 percent chance of showers. High 16. Thursday Night: Cloudy periods with 30 percent chance of showers. Low plus 3. Friday: Cloudy with 40 percent chance of showers. High 14. Friday Night: Cloudy periods with 40 percent chance of showers. Low plus 2. Saturday: A mix of sun and cloud with 30 percent chance of showers. High 14. |
regional radar

■ Cornwall
Rain Snow Ice Mix














