Brockville — Today, sunny. Wind is becoming south 20 km/h late this morning. High 27. Humidex 29°C. UV index 7 or high.
Tonight, clear. Wind south 20 km/h becoming light this evening. Low 18°C.
Thursday, becoming cloudy in the morning. Showers begin in the afternoon. Risk of a thunderstorm in the afternoon. Wind south 30 km/h gusting to 50. High 24°C. Humidex 27. UV index 5 or moderate.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Monday, September 14, 2026