Brockville — Today, a mix of sun and cloud with 40 percent chance of showers and risk of a thunderstorm. High 26°C. Humidex 31. UV index 8 or very high..
Tonight, partly cloudy. 40 percent chance of showers this evening with risk of a thunderstorm. Low 17°C.
Tuesday, a mix of sun and cloud. Clearing late in the afternoon. 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