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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Sat Oct 24 2026 |
| Tonight: Clear. Fog patches developing overnight. Wind up to 15 km/h. Low minus 2. Wind chill minus 6 overnight. Sunday: Sunny. Fog patches dissipating in the morning. Wind becoming southwest 20 km/h late in the morning. High 16. Uv index 3 or moderate. Sunday Night: Clear. Becoming partly cloudy in the evening. Wind becoming southwest 20 km/h after midnight. Low 9. Monday: A mix of sun and cloud with 30 percent chance of showers. High 13. Monday Night: Clear. Low minus 4. Tuesday: Sunny. High 7. Tuesday Night: Clear. Low minus 6. Wednesday: A mix of sun and cloud. High 9. Wednesday Night: Cloudy periods. Low zero. Thursday: A mix of sun and cloud with 30 percent chance of showers. High 15. Thursday Night: Cloudy periods with 30 percent chance of showers. Low 7. Friday: A mix of sun and cloud. High 14. |
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