forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1500 utc May 25 2026 |
| Today: Clearing late this afternoon. High 22. Humidex 25. Uv index 7 or high. Tonight: Clear. Low 12. Tuesday: Sunny in the morning then a mix of sun and cloud with 30 percent chance of showers in the afternoon. Wind becoming southwest 30 km/h late in the morning. High 27. Humidex 30. Uv index 7 or high. Tuesday Night: Clear. Low 16. Wednesday: A mix of sun and cloud with 30 percent chance of showers. High 25. Wednesday Night: Cloudy periods. Low 11. Thursday: A mix of sun and cloud. High 21. Thursday Night: Cloudy periods. Low 10. Friday: Cloudy with 30 percent chance of showers. High 19. Friday Night: Cloudy with 60 percent chance of showers. Low 10. Saturday: Cloudy with 30 percent chance of showers. High 20. Saturday Night: Cloudy periods. Low 9. Sunday: A mix of sun and cloud. High 22. |























