Good Afternoon, Brockville, Leeds-Grenville! Local Weather Update – Tuesday, July 21, 2026

YELLOW WATCH – SEVERE THUNDERSTORM Watch for Our Region!

Brockville — Today, mainly cloudy. 40 percent chance of showers early this afternoon. Showers beginning this afternoon. Risk of a thunderstorm this afternoon. Local amount 5 mm. Wind south 20 km/h gusting to 40. High 25°C. Humidex 30. UV index 7 or high.

Tonight, showers ending near midnight then cloudy with 40 percent chance of showers. Risk of a thunderstorm this evening. Local amount 10 to 15 mm. Wind southwest 20 km/h. Low 17°C.

Wednesday, cloudy with 40 percent chance of showers in the morning. Wind west 20 km/h gusting to 40. High 21°C. UV index 5 or moderate.

Your 5-day local forecast: