Brockville — Today, a mix of sun and cloud. 40 percent chance of showers this afternoon with risk of a thunderstorm. Wind becoming northwest 20 km/h gusting to 40 late this morning. High 26°C. Humidex 31. UV index 7 or high.
Tonight, partly cloudy with 40 percent chance of showers this evening. Becoming clear overnight. Risk of a thunderstorm this evening. Low 14°C.
Wednesday, sunny early in the morning then a mix of sun and cloud with 30 percent chance of showers in the afternoon. Risk of a thunderstorm in the afternoon. Wind becoming west 20 km/h gusting to 40 late in the morning. High 26°C. Humidex 29. 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