forecast
detailed forecast
| Extented weather forecast for Cornwall Ontario and the Seaway Issued by Environment Canada at 1530 ET Sat Aug 1 2026 |
| Tonight: Partly cloudy with 40 percent chance of showers. Showers beginning before morning. Risk of a thunderstorm this evening. Low 20. Sunday: Showers changing to rain at Times heavy late in the morning. Risk of a thunderstorm in the afternoon. Local amount 30 to 40 mm. Wind becoming northeast 30 km/h late in the morning then light in the afternoon. High 27. Humidex 35. Uv index 3 or moderate. Sunday Night: Periods of rain with risk of a thunderstorm. Local amount 10 to 15 mm. Low 19. Monday: Cloudy with 40 percent chance of showers. High 26. Monday Night: Cloudy periods. Low 15. Tuesday: Sunny. High 27. Tuesday Night: Clear. Low 16. Wednesday: Sunny. High 28. Wednesday Night: Cloudy periods with 30 percent chance of showers. Low 18. Thursday: A mix of sun and cloud with 40 percent chance of showers. High 28. Thursday Night: Cloudy periods with 40 percent chance of showers. Low 18. Friday: Cloudy with 30 percent chance of showers. High 28. |
regional radar

■ Cornwall
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