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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 0500 ET Thu Aug 20 2026 |
| Today: A mix of sun and cloud. 30 percent chance of showers late this afternoon. Fog patches dissipating this morning. High 24. Humidex 29. Uv index 7 or high. Tonight: Partly cloudy. 30 percent chance of showers this evening. Fog patches developing overnight. Low 11. Friday: Mainly sunny. Fog patches dissipating in the morning. High 25. Humidex 28. Uv index 7 or high. Friday Night: Clear. Low 15. Saturday: Sunny. High 27. Saturday Night: Cloudy periods with 40 percent chance of showers. Low 18. Sunday: Cloudy with 60 percent chance of showers. High 22. Sunday Night: Cloudy with 40 percent chance of showers. Low 15. Monday: Cloudy with 30 percent chance of showers. High 20. Monday Night: Cloudy periods. Low 14. Tuesday: A mix of sun and cloud. High 24. Tuesday Night: Cloudy periods. Low 14. Wednesday: Cloudy with 60 percent chance of showers. High 23. |
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