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 late this morning. High 26°C. Humidex 29. UV index 7 or high.
Tonight, mainly cloudy. 40 percent chance of showers this evening with risk of a thunderstorm. Fog patches developing near midnight. Low 15°C.
Thursday, a mix of sun and cloud. 40 percent chance of showers in the afternoon with risk of a thunderstorm. Fog patches dissipating in the morning. Wind becoming west 20 km/h late in the morning. High 25°C. Humidex 30. 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