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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 0500 ET Wed Aug 19 2026 |
| Today: Cloudy. 30 percent chance of showers early this morning. A few showers beginning early this morning. Risk of a thunderstorm. Wind becoming southwest 20 km/h late this afternoon. High 23 with temperature falling to 19 this afternoon. Humidex 28. Uv index 4 or moderate. Tonight: Mainly cloudy. 30 percent chance of showers early this evening with risk of a thunderstorm. Fog patches developing late this evening. Low 15. Thursday: A mix of sun and cloud. Fog patches dissipating in the morning. High 24. Humidex 27. Uv index 7 or high. Thursday Night: Clear. Low 11. Friday: Sunny. High 25. Friday Night: Clear. Low 13. Saturday: A mix of sun and cloud with 30 percent chance of showers. High 28. Saturday Night: Cloudy with 60 percent chance of showers. Low 17. Sunday: Cloudy with 60 percent chance of showers. High 21. Sunday Night: Cloudy with 40 percent chance of showers. Low 15. Monday: Cloudy with 40 percent chance of showers. High 21. Monday Night: Cloudy periods. Low 14. Tuesday: A mix of sun and cloud. High 23. |
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