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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Wed Oct 21 2026 |
| Tonight: A few clouds. Fog patches developing after midnight. Low zero. Thursday: A mix of sun and cloud. Fog patches dissipating in the morning. Wind becoming north 20 km/h in the afternoon. High 16. Uv index 3 or moderate. Thursday Night: Clear. Wind up to 15 km/h. Low minus 2. Wind chill minus 5 overnight. Friday: Sunny. High 10. Friday Night: Clear. Low minus 4. Saturday: Sunny. High 12. Saturday Night: Clear. Low minus 1. Sunday: Sunny. High 15. Sunday Night: Cloudy periods. Low 7. Monday: A mix of sun and cloud with 30 percent chance of showers. High 14. Monday Night: Cloudy periods. Low minus 1. Tuesday: Sunny. High 9. |
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