forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Fri Jun 26 2026 |
| Today: Cloudy with 40 percent chance of showers and risk of a thunderstorm. High 22. Humidex 27. Uv index 6 or high. Tonight: Mainly cloudy. 40 percent chance of showers early this evening with risk of a thunderstorm. Fog patches developing near midnight. Low 15. Saturday: Mainly cloudy. 30 percent chance of showers in the afternoon with risk of a thunderstorm. Fog patches dissipating in the morning. High 26. Humidex 30. Uv index 7 or high. Saturday Night: Clear. Low 15. Sunday: Sunny. High 29. Sunday Night: Clear. Low 16. Monday: Sunny. High 29. Monday Night: Cloudy periods with 30 percent chance of showers. Low 19. Tuesday: Cloudy with 40 percent chance of showers. High 29. Tuesday Night: Cloudy with 40 percent chance of showers. Low 21. Wednesday: Cloudy with 30 percent chance of showers. High 32. Wednesday Night: Cloudy with 30 percent chance of showers. Low 22. Thursday: A mix of sun and cloud with 30 percent chance of showers. High 31. |
regional radar

Cornwall
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