HEAT WARNING continues for our region. Daytime highs of 32 to 35 degrees Celsius, with humidex values of 37 to 42. Overnight lows of 20 to 23 degrees Celsius. Continuing through Tuesday or possibly Wednesday for some areas.
Brockville — Today, sunny. Wind south 20 km/h becoming light late this morning. High 34. Humidex 42. UV index 8 or very high.
Tonight, clear. Low 21.
Tuesday, sunny. Wind becoming southwest 20 km/h gusting to 40 late in the morning. High 34. Humidex 40. UV index 8 or very high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Tuesday, September 1, 2026