Brockville — Today, mainly sunny. Wind southwest 30 km/h gusting to 50. High 32. Humidex 39. UV index 9 or very high.
Tonight, increasing cloudiness is expected early this evening. There is a 60 percent chance of showers late this evening and overnight, with a risk of a thunderstorm. Wind southwest 30 km/h gusting to 50, becoming light late this evening. Low 21.
Friday will be cloudy. 40 percent chance of showers in the morning. Becoming a mix of sun and cloud in the afternoon. High 26. Humidex 35. UV index 7 or high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Monday, September 14, 2026