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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1739 ET Mon Oct 12 2026 |
| Tonight: Showers. Local amount 5 to 10 mm. Wind becoming northeast 30 km/h gusting to 50 this evening. Low 6. Tuesday: Showers with risk of a thunderstorm. Amount 15 to 25 mm. Wind east 30 km/h gusting to 50 becoming light in the afternoon. High 10. Uv index 2 or low. Tuesday Night: Showers ending near midnight then mainly cloudy with 40 percent chance of drizzle. Risk of a thunderstorm in the evening. Wind becoming west 20 km/h before morning. Temperature steady near 9. Wednesday: Cloudy. High 11. Wednesday Night: Cloudy. Low 7. Thursday: Sunny. High 12. Thursday Night: Cloudy with 40 percent chance of showers. Low 6. Friday: Rain. High 17. Friday Night: Rain. Windy. Low plus 3. Saturday: A mix of sun and cloud with 30 percent chance of rain showers or flurries. Windy. High 7. Saturday Night: Clear. Low minus 1. Sunday: A mix of sun and cloud. High 10. |
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