Brockville — Today, cloudy with 30 percent chance of showers. Wind becoming northwest 20 km/h this afternoon. High 21°C. Humidex 26. UV index 4 or moderate.
Tonight, cloudy, becoming partly cloudy this evening. Fog patches developing after midnight. Low 13°C.
Wednesday, clearing in the morning. Fog patches dissipating in the morning. High 25°C. Humidex 30. UV index 7 or high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Monday, September 14, 2026