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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Thu Jul 16 2026 |
| Today: Sunny near noon then a mix of sun and cloud with 30 percent chance of showers this afternoon. Risk of a thunderstorm this afternoon. Widespread smoke early this afternoon. Wind northwest 20 km/h gusting to 40. High 26. Humidex 29. Uv index 8 or very high. Tonight: Clear. Low 14. Friday: Sunny. High 25. Humidex 27. Uv index 8 or very high. Friday Night: Cloudy periods with 40 percent chance of showers. Low 14. Saturday: Cloudy with 60 percent chance of showers. High 20. Saturday Night: Cloudy with 30 percent chance of showers. Low 13. Sunday: Sunny. High 23. Sunday Night: Clear. Low 12. Monday: Sunny. High 25. Monday Night: Cloudy with 40 percent chance of showers. Low 17. Tuesday: Cloudy with 60 percent chance of showers. High 23. Tuesday Night: Cloudy. Low 17. Wednesday: Cloudy. High 21. |
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