Brockville — Today, mainly sunny. Wind becoming southwest 20 km/h this afternoon. High 28°C. Humidex 31. UV index 9 or very high.
Tonight, clear, with increasing cloudiness near midnight then 70 percent chance of showers overnight. Wind becoming southwest 20 km/h gusting to 40 before morning. Low 16°C.
Saturday, cloudy with 70 percent chance of showers. Risk of a thunderstorm in the afternoon. Wind southwest 30 km/h gusting to 50. High 23°C. Humidex 28. UV index 6 or high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Morning Weather Update – Thursday, June 4, 2026