Brockville – Today is mainly cloudy, with a 30 percent chance of showers this afternoon and a risk of a thunderstorm. The high is 28, and the humidex is 37. The UV index is 9 or very high.
Tonight will be mainly cloudy, with a 60 percent chance of showers and a risk of a thunderstorm. The low will be 20.
Thursday will be cloudy with a 30 percent chance of showers and a risk of a thunderstorm. The wind will be coming out of the southwest at 20 km/h late in the morning. Thursday’s high is 24, and the humidex is 31. The UV index is 1 or low.
Your 5-day local forecast:
More Stories
Cataraqui Conservation Issues Flood Outlook Statement for Inland Lakes & Streams
Yellow Warning – Rainfall Issued for Brockville, Leeds-Grenville For Tonight Into Saturday
Good Evening, Brockville, Leeds-Grenville! Local Weather Update – Friday, March 6, 2026