Brockville — Today, a mix of sun and cloud. 40 percent chance of showers this afternoon with risk of a thunderstorm. Wind becoming southwest 20 km/h gusting to 40 late this morning. High 29°C. Humidex 37. UV index 10 or very high.
Tonight, partly cloudy. Low 17°C.
Friday, mainly cloudy. 60 percent chance of showers late in the morning and in the afternoon with risk of a thunderstorm. Wind becoming southwest 20 km/h gusting to 40 in the morning. High 30°C. Humidex 39. UV index 7 or high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Tuesday, September 1, 2026