YELLOW WARNING – Rainfall: Heavy rainfall is expected. Total rainfall amounts of 50 to 80 mm. Local rainfall amounts may approach 100 mm for locations that receive multiple thunderstorms. This morning through tonight.
Brockville — Today, rain at times heavy with risk of a thunderstorm. Local amount 30 to 40 mm. High 24°C. Humidex 32. UV index 3 or moderate.
Tonight, periods of rain with risk of a thunderstorm. Local amount 20 to 30 mm. Low 17°C.
Monday, Civic Holiday, periods of rain ending near noon then cloudy with 40 percent chance of showers. Wind becoming northwest 20 km/h gusting to 40 in the morning. High 25°C. Humidex 30. UV index 5 or moderate.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Sunday, October 25, 2026