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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Tue Jul 28 2026 |
| Tonight: Showers. Risk of a thunderstorm this evening. Local amount 10 to 20 mm. Low 20. Wednesday: Showers. Risk of a thunderstorm in the afternoon. Local amount 10 to 20 mm. Wind becoming northeast 30 km/h late in the afternoon. Temperature steady near 20. Humidex 29. Uv index 3 or moderate. Wednesday Night: Showers. Risk of a thunderstorm early in the evening. Wind northeast 30 km/h becoming light after midnight. Temperature steady near 18. Thursday: A mix of sun and cloud with 40 percent chance of showers. High 22. Thursday Night: Clear. Low 18. Friday: Sunny. High 27. Friday Night: Cloudy periods. Low 18. Saturday: Cloudy. High 27. Saturday Night: Cloudy. Low 19. Sunday: Cloudy with 40 percent chance of showers. High 23. Sunday Night: Cloudy with 40 percent chance of showers. Low 18. Monday: Cloudy. High 26. |
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