Brockville — Today, sunny. Wind southwest 20 km/h becoming light late this morning. High 30°C. Humidex 33. UV index 9 or very high.
Tonight, increasing cloudiness. 40 percent chance of showers. Showers beginning before morning. Risk of a thunderstorm this evening and overnight. Low 20°C.
Wednesday, Showers with risk of a thunderstorm. Local amount 10 to 15 mm. Temperature steady near 21°C. Humidex 29.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Morning Weather Update – Canada Day, Wednesday, July 1, 2026