Brockville — Today, a mix of sun and cloud. There is a 30 percent chance of showers late this afternoon, with a risk of a thunderstorm. High 30. Humidex 36. UV index 9 or very high.
Tonight, partly cloudy with a 30 percent chance of showers early this evening, then clear. Risk of a thunderstorm early this evening. Low 17.
Saturday, increasing cloudiness early in the morning. There is a 30 percent chance of showers late in the afternoon, with a risk of a thunderstorm. High 32. Humidex 40. 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