Brockville — Today, mainly cloudy. There is a 40% chance of showers this afternoon, with a risk of a thunderstorm. Fog patches are dissipating this morning. High 27. Humidex 35. UV index 8 or very high.
Tonight, mainly cloudy with a 60 percent chance of showers and a risk of a thunderstorm. Fog patches are developing after midnight. Low 17.
Thursday, a mix of sun and cloud with a 60 percent chance of showers and a risk of a thunderstorm. Fog patches are dissipating in the morning. High 26. Humidex 34. UV index 8 or very high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Saturday, August 29, 2026