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| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1500 utc Jun 17 2026 |
| Today: A mix of sun and cloud with 60 percent chance of showers and risk of a thunderstorm. Wind becoming southwest 20 km/h this afternoon. High 24. Humidex 28. Uv index 8 or very high. Tonight: Partly cloudy. 40 percent chance of showers early this evening. Showers beginning before morning. Risk of a thunderstorm before morning. Low 14. Thursday: Showers ending near noon then cloudy with 60 percent chance of showers. Risk of a thunderstorm in the morning and early in the afternoon. Local amount 15 to 25 mm. Wind becoming southeast 20 km/h gusting to 40 then southwest 40 gusting to 70 late in the morning. High 23. Humidex 28. Uv index 7 or high. Thursday Night: Cloudy with 40 percent chance of showers. Windy. Low 14. Friday: Cloudy with 60 percent chance of showers. High 20. Friday Night: Cloudy with 40 percent chance of showers. Low 13. Saturday: Cloudy with 40 percent chance of showers. High 19. Saturday Night: Cloudy with 40 percent chance of showers. Low 13. Sunday: Cloudy with 30 percent chance of showers. High 23. Sunday Night: Cloudy periods with 30 percent chance of showers. Low 13. Monday: Cloudy with 40 percent chance of showers. High 21. Monday Night: Cloudy with 60 percent chance of rain. Low 14. Tuesday: A mix of sun and cloud with 40 percent chance of showers. High 24. |
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