Brockville — Today, sunny, a mix of sun and cloud late this afternoon with a 30 percent chance of showers. Local smoke. Wind northeast 20 km/h becoming light late this morning. High 29. Humidex 35. UV index 8 or very high.
Tonight, partly cloudy with a 30 percent chance of showers this evening. Local smoke. Low 19.
Thursday, a mix of sun and clouds. There is a 40 percent chance of showers late in the afternoon. Local smoke. High 28. Humidex 33. UV index 8 or very high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Monday, September 14, 2026