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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Mon Sep 28 2026 |
| Tonight: Cloudy. 40 percent chance of showers this evening. Wind northeast 20 km/h becoming light early this evening. Low 8. Tuesday: Cloudy. Becoming a mix of sun and cloud late in the morning. High 20. Uv index 5 or moderate. Tuesday Night: Clear. Becoming partly cloudy after midnight. Fog patches developing overnight. Low 8. Wednesday: Cloudy. High 21. Wednesday Night: Cloudy. Low 14. Thursday: Cloudy with 30 percent chance of showers. High 23. Thursday Night: Cloudy with 40 percent chance of showers. Low 13. Friday: Cloudy. High 18. Friday Night: Cloudy periods. Low 6. Saturday: A mix of sun and cloud. High 17. Saturday Night: Cloudy. Low 8. Sunday: Cloudy. High 15. |
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