Brockville — Today, a mix of sun and cloud. There is a 40 percent chance of showers late this afternoon. High 27. Humidex 30. UV index 9 or very high.
Tonight, mainly cloudy with a 40 percent chance of showers early this evening. A few showers are beginning this evening. There is a risk of a thunderstorm late this evening and overnight. Low 18.
Sunday, cloudy, becoming a mix of sun and cloud in the afternoon. Wind becoming northwest 20 km/h gusting to 40 near noon. High 26. Humidex 29. UV index 6 or high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Tuesday, September 1, 2026