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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Sat Jul 18 2026 |
| Today: Showers with risk of a thunderstorm. Local amount 10 to 20 mm. Local smoke. Wind southwest 20 km/h. High 24. Humidex 31. Uv index 3 or moderate. Tonight: Cloudy. 40 percent chance of showers early this evening with risk of a thunderstorm. Local smoke. Wind northwest 20 km/h gusting to 40. Low 13. Sunday: Mainly cloudy. Clearing late in the morning. Wind northwest 20 km/h gusting to 40. High 23. Humidex 25. Uv index 7 or high. Sunday Night: Clear. Low 12. Monday: Sunny. High 26. Monday Night: Cloudy periods with 40 percent chance of showers. Low 15. Tuesday: Cloudy with 60 percent chance of showers. High 25. Tuesday Night: Cloudy with 60 percent chance of showers. Low 17. Wednesday: A mix of sun and cloud with 30 percent chance of showers. High 22. Wednesday Night: Cloudy periods. Low 14. Thursday: A mix of sun and cloud. High 25. Thursday Night: Cloudy periods. Low 15. Friday: A mix of sun and cloud. High 25. |
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