Brockville — Today, sunny, becoming a mix of sun and cloud this morning. Wind up to 15 km/h. High minus 2. Wind chill is minus 17 this morning and minus 5 this afternoon. UV index is 1 or low.
Tonight, increasing cloudiness early this evening. 70 percent chance of flurries or rain showers late this evening and after midnight. Wind becoming southwest 30 km/h gusting to 50 this evening. Temperature rising to plus 2 by morning.
Sunday, mainly cloudy with a 30 percent chance of flurries in the morning. Wind southwest 30 km/h gusting to 50 becoming west 50 gusting to 70 in the morning, then northwest 30 gusting to 50 near noon. Temperature falling to minus 3 in the morning, then remains steady. Wind chill near minus 12. 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