forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1100 ET Mon Sep 14 2026 |
| Today: Sunny. Becoming a mix of sun and cloud this afternoon. Wind northwest 20 km/h becoming light this afternoon. High 19. Uv index 5 or moderate. Tonight: Clearing. Fog patches developing overnight. Low 6. Tuesday: Sunny in the morning then a mix of sun and cloud with 60 percent chance of showers in the afternoon. Fog patches dissipating in the morning. Wind becoming south 20 km/h early in the afternoon. High 20. Uv index 6 or high. Tuesday Night: Cloudy periods with 40 percent chance of showers. Low 14. Wednesday: Sunny. High 26. Wednesday Night: Cloudy periods. Low 13. Thursday: A mix of sun and cloud with 30 percent chance of showers. High 25. Thursday Night: Clear. Low 11. Friday: Sunny. High 23. Friday Night: Clear. Low 8. Saturday: Cloudy. High 17. Saturday Night: Cloudy with 30 percent chance of showers. Low 10. Sunday: Cloudy with 30 percent chance of showers. High 19. |
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