Brockville — Today, becoming cloudy this morning with 30 percent chance of showers changing to 70 percent chance of showers near noon. Risk of a thunderstorm this afternoon. High 24°C. Humidex 27. UV index 6 or high.
Tonight, cloudy with 70 percent chance of showers and risk of a thunderstorm. Low 16°C
Friday, cloudy with 30 percent chance of showers in the afternoon with risk of a thunderstorm. High 22°C. Humidex 28. UV index 5 or moderate.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Saturday, August 29, 2026