Brockville — Today, showers with a risk of a thunderstorm. Local amount 10 to 20 mm. Wind southwest 20 km/h becoming light this afternoon. High 29. Humidex 38. UV index 4 or moderate.
Tonight, cloudy. 40 percent chance of showers this evening. Risk of a thunderstorm early this evening. Low 16.
Tuesday, cloudy. High 25. Humidex 31. 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