Brockville — Today, mainly cloudy with 40 percent chance of showers this morning and early this afternoon. Showers beginning this afternoon. Risk of thunderstorms. Amount 5 mm. Wind southwest 40 km/h gusting to 70. High 18. UV index 5 or moderate.
Tonight, rain. Amount 5 mm. Wind southwest 30 km/h gusting to 50 becoming light this evening. Low plus 5.
Wednesday, rain ending in the afternoon then mainly cloudy. Amount 5 mm. High 10. UV index 4 or moderate.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Tuesday, September 1, 2026