Brockville — Today, cloudy with 40 percent chance of showers early this morning. A few showers beginning this morning. Risk of a thunderstorm. Local smoke late this morning and this afternoon. Local amount 10 to 20 mm. Wind southeast 20 km/h becoming west 20 late this afternoon. High 23°C. Humidex 31. UV index 3 or moderate.
Tonight, mainly cloudy with 40 percent chance of showers early this evening with risk of a thunderstorm. Local smoke. Wind northwest 20 km/h gusting to 40. Low 15°C.
Sunday, mainly cloudy, clearing late in the morning. Wind northwest 20 km/h gusting to 40. High 23°C. Humidex 25. UV index 7 or high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Tuesday, September 1, 2026