Brockville — Today is mainly cloudy with a 40 percent chance of showers this morning. Wind west 20 km/h becoming north 20 km/h early this afternoon. High 28. Humidex 37. UV index 8 or very high.
Tonight will be clear. Becoming partly cloudy this evening. Low 15.
Saturday will be sunny with a high of 30. Humidex 34. UV index 9 or very high.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Monday, September 14, 2026