Brockville — Today, a few showers ending early this morning then mainly cloudy. 40 percent chance of showers this afternoon. Risk of a thunderstorm. High 22°C. Humidex 27. UV index 6 or high.
Tonight, mainly cloudy with 40 percent chance of showers early this evening with risk of a thunderstorm. Fog patches developing near midnight. Low 14°C.
Saturday, becoming a mix of sun and cloud in the morning. 30 percent chance of showers in the afternoon. Risk of a thunderstorm in the afternoon. Fog patches dissipating in the morning. High 26°C. Humidex 31. UV index 8 or very high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Saturday, August 29, 2026