Brockville — Today, mainly cloudy with 40 percent chance of showers early this morning. Showers beginning this morning. Risk of a thunderstorm. Local amount 15 to 25 mm. Temperature steady near 22°C. Humidex 30. UV index 4 or moderate.
Tonight, showers ending near midnight then mainly cloudy with 40 percent chance of showers. Risk of a thunderstorm this evening and overnight. Temperature steady near 19°C.
Thursday, mainly cloudy with 40 percent chance of showers in the afternoon with risk of a thunderstorm. High 26°C. Humidex 34. UV index 9 or very high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Saturday, October 10, 2026