Brockville — Today, mainly cloudy. Risk of freezing drizzle early this morning. Wind up to 15 km/h. High plus 5°C. Wind chill minus 11 this morning. UV index 4 or moderate.
Tonight, cloudy. Periods of rain beginning late this evening. Risk of a thunderstorm overnight. Amount 5 to 10 mm. Wind becoming south 20 km/h gusting to 40 near midnight. Low plus 5°C.
Saturday, periods of rain ending early in the morning then cloudy with 40 percent chance of showers in the morning and early in the afternoon. Showers beginning in the afternoon. Risk of a thunderstorm in the afternoon. Local amount 5 to 10 mm. Wind southwest 30 km/h gusting to 50. High 11°C. UV index 4 or moderate.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Tuesday, September 1, 2026