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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt thu jun 11 2026


slz022-024-120900-
saint lawrence river from cape vincent to saint regis
1003 pm edt thu jun 11 2026

.overnight...southwest winds 10 knots or less. mostly
cloudy. 
.friday...south winds 5 to 15 knots becoming southwest. a chance
of showers and thunderstorms in the afternoon. 
.friday night...southwest winds 5 to 15 knots diminishing to less
than 10 knots. mainly clear. 
.saturday...southwest winds 10 knots or less. sunny.
.saturday night...southwest winds 5 to 10 knots. partly cloudy. 
.sunday...southwest winds 5 to 15 knots. showers with a chance of
thunderstorms. 
.monday...west winds 5 to 15 knots becoming southwest less than
10 knots. partly cloudy. 
.tuesday...southwest winds 10 knots or less. 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
1002 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 weak 29.8 inch ridge of high pressure will slide 
east across new york state overnight. a cold front will cross the 
lake between friday morning and early friday afternoon, with a 30.0 
inch high then ridging 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 plains states will push over the lake on monday, then a trough 
averaging 29.8 inches will cross the lake on tuesday.


loz063>065-120900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt thu jun 11 2026

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

winds and waves higher in and near thunderstorms.

$$