Brockville — Today, becoming a mix of sun and cloud this morning. 30 percent chance of showers this afternoon. Risk of a thunderstorm this afternoon. Fog patches dissipating this morning. High 26°C. Humidex 31. UV index 8 or very high.
Tonight, partly cloudy with 30 percent chance of showers early this evening then clear. Risk of a thunderstorm early this evening. Fog patches developing overnight. Low 14°C.
Saturday, sunny. Fog patches dissipating in the morning. High 28°C. Humidex 31. UV index 1 or low.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Tuesday, September 1, 2026