Brockville — Today, increasing cloudiness with 40 percent chance of showers late this morning and early this afternoon. A few showers beginning this afternoon. Risk of a thunderstorm late this morning and this afternoon. Fog patches dissipating early this morning. High 28°C. Humidex 34. UV index 9 or very high.
Tonight, a few showers ending early this evening then cloudy with 40 percent chance of showers. Risk of a thunderstorm this evening. Low 20°C.
Friday, becoming a mix of sun and cloud in the morning. 40 percent chance of showers late in the afternoon. Risk of a thunderstorm late in the afternoon. High 28°C. Humidex 34. UV index 8 or very high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Saturday, October 24, 2026