Yellow Warning – Rainfall for our region overnight into Saturday morning. Rainfall amounts of 15 to 40 mm with locally higher amounts possible due to thunderstorms. Substantial snow melt contributing to ponding on roads and low lying areas.
Brockville – 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. Temperature rising to 6 by morning.
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 early in the afternoon. Risk of a thunderstorm in the afternoon. Local amount 10 to 15 mm. Wind south 20 km/h gusting to 40. High 14. UV index 4 or moderate.
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Good Afternoon, Brockville, Leeds-Grenville! Local Weather Update – Friday, May 15, 2026