forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Sat Aug 15 2026 |
| Tonight: Clear. Fog patches developing after midnight. Low 9. Sunday: Increasing cloudiness. Fog patches dissipating in the morning. Wind becoming northeast 30 km/h in the afternoon. High 24. Humidex 28. Uv index 8 or very high. Sunday Night: Cloudy with 60 percent chance of showers and risk of a thunderstorm. Wind northeast 20 km/h becoming light near midnight. Low 16. Monday: Cloudy with 30 percent chance of showers. High 25. Monday Night: Cloudy periods with 30 percent chance of showers. Low 14. Tuesday: A mix of sun and cloud. High 26. Tuesday Night: Clear. Low 14. Wednesday: Cloudy with 40 percent chance of showers. High 25. Wednesday Night: Cloudy with 60 percent chance of showers. Low 14. Thursday: A mix of sun and cloud with 30 percent chance of showers. High 23. Thursday Night: Cloudy periods with 40 percent chance of showers. Low 12. Friday: A mix of sun and cloud. High 23. |
regional radar

■ Cornwall
Rain Snow Ice Mix














