Brockville — Today, mainly cloudy with a few showers beginning early this morning and ending near noon then 40 percent chance of showers this afternoon. Risk of a thunderstorm. High 30°C. Humidex 38. UV index 7 or high.
Tonight, partly cloudy with 40 percent chance of showers and risk of a thunderstorm. Low 22°C.
Canada Day – Wednesday, a mix of sun and cloud. 40 percent chance of showers in the afternoon with risk of a thunderstorm. Wind becoming southwest 20 km/h gusting to 40 near noon. High 34°C. Humidex 45. UV index 10 or very high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Tuesday, September 1, 2026