ORANGE WARNING – HEAT: A long duration heat event begins today. Maximum temperatures of 31 to 35 degrees Celsius. Minimum temperatures of 21 to 25 degrees Celsius.
Brockville — Today, a mix of sun and cloud. 40 percent chance of showers this afternoon with risk of a thunderstorm. Wind becoming southwest 20 km/h gusting to 40 near noon. High 34°C. Humidex 46. UV index 10 or very high.
Tonight, partly cloudy. 40 percent chance of showers early this evening with risk of a thunderstorm. Wind southwest 20 km/h gusting to 40 becoming light this evening. Low 23°C.
Thursday, a mix of sun and cloud. 40 percent chance of showers in the afternoon with risk of a thunderstorm. Wind becoming southwest 20 km/h gusting to 40 near noon. High 34°C. Humidex 45. UV index 10 or very high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Tuesday, September 1, 2026