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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 0500 ET Mon Aug 17 2026 |
| Today: Mainly cloudy. 40 percent chance of showers this morning. High 25. Humidex 33. Uv index 7 or high. Tonight: A few clouds. Fog patches developing after midnight. Low 14. Tuesday: A mix of sun and cloud. Fog patches dissipating in the morning. High 25. Humidex 29. Uv index 7 or high. Tuesday Night: Cloudy periods with 30 percent chance of showers. Low 19. Wednesday: Cloudy with 60 percent chance of showers. High 22. Wednesday Night: Clear. Low 13. Thursday: A mix of sun and cloud with 30 percent chance of showers. High 24. Thursday Night: Cloudy periods with 30 percent chance of showers. Low 12. Friday: A mix of sun and cloud. High 25. Friday Night: Cloudy periods. Low 14. Saturday: Cloudy. High 23. Saturday Night: Cloudy. Low 15. Sunday: A mix of sun and cloud. High 22. |
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