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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
126 pm edt thu jun 11 2026


slz022-024-112115-
saint lawrence river from cape vincent to saint regis
126 pm edt thu jun 11 2026

.this afternoon...southwest winds 5 to 10 knots. a chance of
showers late. 
.tonight...southwest winds 10 knots or less. a chance of showers
and thunderstorms early. 
.friday...south winds 5 to 10 knots. a chance of showers and
thunderstorms in the afternoon. 
.friday night...south winds 5 to 15 knots becoming southwest less
than 10 knots. mainly clear. 
.saturday...southwest winds 5 to 10 knots. mainly clear, then
becoming partly cloudy. 
.sunday...southwest winds 5 to 15 knots. showers with a chance of
thunderstorms. 
.monday...southwest winds 5 to 15 knots diminishing to less than
10 knots. partly cloudy. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
125 pm edt thu jun 11 2026

for waters beyond five nautical miles of shore on lake ontario

waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.

.synopsis...a warm front will cross the lake tonight ahead of a 29.7 
inch trough that will cross the lake later friday. associated with 
the trough, an attendant cold front will cross the lake friday 
afternoon and evening. a 30.0 inch high will ridge across the lower 
great lakes friday night through sunday morning, before a cold front 
crosses the region later sunday or sunday night. the eastern edge of 
a 30.1 inch high over the central portion of the conus will push 
over the lake on monday. a trough averaging 29.8 inches will cross 
the lake on tuesday.


loz063>065-112115-
lake ontario open waters from hamlin beach to the saint lawrence
river-
125 pm edt thu jun 11 2026

.this afternoon...southeast winds 5 to 15 knots. waves 1 to
2 feet. 
.tonight...southwest winds 5 to 10 knots. a chance of showers
early. waves 1 foot or less. 
.friday...south winds 5 to 15 knots increasing to 15 to 20 knots.
showers likely with a chance of thunderstorms in the morning,
then a chance of showers and thunderstorms in the afternoon.
waves 1 to 3 feet building to 2 to 4 feet. 
.friday night...south winds 15 to 20 knots becoming west 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.saturday...west winds 5 to 15 knots becoming south. waves 1 to
2 feet. 
.sunday...south winds 10 to 15 knots becoming west 15 to
20 knots. showers with a chance of thunderstorms. waves 1 to
3 feet. 
.monday...west winds 15 to 20 knots becoming southwest 5 to
15 knots. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$