Brockville — Today, mainly cloudy with a 60 percent chance of showers and a risk of a thunderstorm. Wind southwest 20 km/h gusting to 50, increasing to 40 gusting to 60 this afternoon, then diminishing to 20. High 27. Humidex 35. UV index 8 or very high.
Tonight, partly cloudy. Becoming cloudy after midnight. Wind west 20 km/h becoming light early this evening. Low 16.
Sunday, cloudy. Clearing late in the afternoon. High 29. Humidex 34. 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