Special Air Quality Statement in effect for our region: Smoke is causing or expected to cause poor air quality and reduced visibility. Smoke from forest fires is expected to continue to affect much of southern Ontario today. The wildfire smoke may persist into tonight and possibly Tuesday before finally easing. Air quality and visibility due to wildfire smoke can fluctuate over short distances and can vary considerably from hour to hour.
Brockville — Today, mainly sunny. Increasing cloudiness near noon, then a 30 percent chance of showers late this afternoon. Risk of a thunderstorm late this afternoon. Widespread smoke. High 28. Humidex 33. UV index 8 or very high.
Tonight, partly cloudy. 30 percent chance of showers this evening with risk of a thunderstorm. Widespread smoke. Low 15.
Tuesday is a mix of sun and clouds. Becoming sunny in the morning. Local smoke. High 27. Humidex 32. 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