Brockville – Today’s forecast will be a mix of sun and cloud with fog patches dissipating this morning. Today’s high is 27, and the humidex is 31. The UV index is 9 or very high.
Tonight will be mainly cloudy with a low of 17.
Tuesday will be cloudy with a 30 percent chance of showers. The wind is becoming south at 20 km/h and gusting to 40 in the morning. Tuesday’s high is 2,6 and the humidex is 31. UV index 5 or moderate.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Wednesday, September 30, 2026