Brockville — Today, cloudy with 70 percent chance of showers. Risk of a thunderstorm this afternoon. Wind becoming south 20 km/h then southwest 40 gusting to 70 late this morning. High 23°C. Humidex 29. UV index 6 or high.
Tonight, cloudy with 70 percent chance of showers early this evening then 30 percent chance of showers this evening. Risk of a thunderstorm this evening. Wind west 20 km/h gusting to 40 becoming light late this evening. Wind becoming northwest 20 gusting to 40 before morning. Low 15°C.
Sunday, cloudy. Wind northwest 20 km/h gusting to 40. High 24°C. Humidex 30. 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