Brockville — Today, mainly cloudy. There is a 40% chance of showers this afternoon, with a risk of a thunderstorm. Fog patches are dissipating this morning. High 27. Humidex 35. UV index 8 or very high.
Tonight, partly cloudy with a 40% chance of showers. There is a risk of a thunderstorm this evening. Low 16.
Friday, a mix of sun and cloud. Becoming sunny in the morning. High 30. Humidex 36. 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