Brockville — Today, increasing cloudiness early this morning. 60 percent chance of showers late this morning and this afternoon with risk of a thunderstorm. Wind becoming southwest 20 km/h gusting to 40 this morning. High 23°C. Humidex 30. UV index 5 or moderate.
Tonight, cloudy with 40 percent chance of showers. Risk of a thunderstorm early this evening. Wind southwest 20 km/h becoming northwest 20 late this evening. Low 14°C.
Friday, mainly cloudy with 30 percent chance of showers in the morning. Wind north 20 km/h becoming light late in the morning. High 22°C. Humidex 26. UV index 6 or high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Saturday, October 10, 2026