forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Sat Jun 27 2026 |
| Today: A mix of sun and cloud. 30 percent chance of showers with risk of a thunderstorm. High 27. Humidex 32. Uv index 7 or high. Tonight: Partly cloudy with 30 percent chance of showers early this evening then clear. Risk of a thunderstorm early this evening. Fog patches developing overnight. Wind northeast 30 km/h becoming light this evening. Low 14. Sunday: Sunny in the morning and early in the afternoon then a mix of sun and cloud with 30 percent chance of showers in the afternoon. Risk of a thunderstorm in the afternoon. Fog patches dissipating in the morning. High 28. Humidex 31. Uv index 1 or low. Sunday Night: Clear. Low 16. Monday: Sunny. High 29. Monday Night: Cloudy periods. Low 19. Tuesday: Cloudy with 30 percent chance of showers. High 31. Tuesday Night: Cloudy. Low 21. Wednesday: Cloudy with 30 percent chance of showers. High 32. Wednesday Night: Cloudy. Low 22. Thursday: A mix of sun and cloud. High 31. Thursday Night: Cloudy periods with 30 percent chance of showers. Low 20. Friday: Cloudy with 30 percent chance of showers. High 31. |
regional radar

Cornwall
Rain Snow Ice Mix














