Brockville — Today, mainly cloudy with 40 percent chance of showers and risk of a thunderstorm. Fog patches dissipating this morning. High 29°C. Humidex 38. UV index 8 or very high.
Tonight, partly cloudy, 40 percent chance of showers this evening with risk of a thunderstorm. Low 18°C.
Friday, a mix of sun and cloud, 30 percent chance of showers in the afternoon with risk of a thunderstorm. High 29°C. Humidex 37. UV index 8 or very high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Tuesday, September 1, 2026