ORANGE WARNING – HEAT: A long duration heat event continues. Maximum temperatures near 32 degrees Celsius and minimum temperatures near 21 degrees Celsius. The hottest conditions are expected to continue through today, with maximum temperatures up to 32 degrees Celsius expected. Minimum temperatures near 21 degrees Celsius will provide little relief from the heat.
Brockville — Today, sunny, with increasing cloudiness this morning then 40 percent chance of showers this afternoon. Risk of a thunderstorm this afternoon. Wind becoming southwest 30 km/h gusting to 50 this morning. High 31°C. Humidex 39. UV index 10 or very high.
Tonight, mainly cloudy with 40 percent chance of showers this evening and risk of a thunderstorm. Clearing overnight. Wind southwest 20 km/h becoming light this evening. Low 19°C.
Saturday, a mix of sun and cloud with 30 percent chance of showers. Becoming sunny late in the afternoon. High 27°C. Humidex 30. UV index 9 or very high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Tuesday, September 1, 2026