Yellow Warning – Rainfall: Heavy rain is expected. The ground, already near saturation, has little ability to absorb further rainfall. Rainfall amounts of 30 to 50 mm. Late this afternoon into Thursday morning.
Brockville — Today, cloudy with a 40 percent chance of showers late this morning and this afternoon. Rain at times heavy beginning late this afternoon. Amount 5 mm. Wind southwest 20 km/h becoming light near noon. High 14°C. UV index 4 or moderate.
Tonight, rain at times heavy. Amount 30 to 40 mm. Wind north 20 km/h. Low 6°C.
Thursday, rain at times heavy ending in the morning then cloudy with 30 percent chance of showers. Wind northwest 20 km/h. High 9°C. UV index 3 or moderate.
Your 5-day local forecast:
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Good Morning, Brockville, Leeds-Grenville! Local Weather Update – Thursday, October 1, 2026