Brockville – Tonight will be mainly cloudy with a 30 percent chance of showers. Tonight’s low is 20.
Wednesday will be mainly cloudy with a 30 percent chance of showers in the afternoon and a risk of a thunderstorm. Wednesday’s high is 29. The humidex will be 38, and the UV index is 9 or very high.
Wednesday night will be mainly cloudy with a 60 percent chance of showers and a risk of a thunderstorm. Wednesday night will see a low of 20.
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Good Evening, Brockville, Leeds-Grenville! Local Weather Update – Friday, March 6, 2026