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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Thu Aug 20 2026 |
| Tonight: Partly cloudy. 30 percent chance of showers this evening. Fog patches developing overnight. Low 13. Friday: Sunny. Fog patches dissipating in the morning. High 25. Humidex 28. Uv index 7 or high. Friday Night: Clear. Becoming partly cloudy after midnight. Low 13. Saturday: Sunny. High 27. Saturday Night: Showers. Low 16. Sunday: Showers. High 22. Sunday Night: Cloudy with 40 percent chance of showers. Low 16. Monday: Cloudy with 40 percent chance of showers. High 21. Monday Night: Cloudy with 30 percent chance of showers. Low 14. Tuesday: A mix of sun and cloud. High 23. Tuesday Night: Cloudy periods. Low 15. Wednesday: A mix of sun and cloud. High 24. |
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