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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt fri jun 12 2026


slz022-024-122100-
saint lawrence river from cape vincent to saint regis
1003 am edt fri jun 12 2026

.this afternoon...southwest winds 10 to 15 knots increasing to
15 to 20 knots. a chance of showers and thunderstorms.

.tonight...southwest winds 5 to 15 knots diminishing to less than
10 knots. becoming mainly clear. 
.saturday...southwest winds 10 knots or less. sunny.
.saturday night...southwest winds 5 to 10 knots. a chance of
showers overnight. 
.sunday...southwest winds 5 to 10 knots becoming west. showers.
.monday...west winds 5 to 15 knots becoming southwest less than
10 knots. partly cloudy. 
.tuesday...southwest winds 10 knots or less becoming south.
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 am edt fri jun 12 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 cold front will cross the lake early this afternoon, 
with a 30.0 inch high then ridging across the lower great lakes 
tonight through sunday morning. another cold front crosses the 
region later sunday and sunday night. the eastern edge of a 30.1 
inch high over the plains states will push over the lake on monday 
with a trough averaging 29.8 inches to cross the lake on tuesday.


loz063>065-122100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt fri jun 12 2026

.this afternoon...southwest winds 15 to 25 knots becoming west. a
chance of showers and thunderstorms. waves 1 to 2 feet building
to 3 to 6 feet. 
.tonight...west winds 15 to 25 knots becoming southwest and
diminishing to 5 to 15 knots. waves 3 to 6 feet subsiding to 1 to
3 feet. 
.saturday...west winds 5 to 15 knots becoming southwest. waves
1 to 3 feet. 
.saturday night...southwest winds 10 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 during the day,
then showers sunday night. waves 1 to 3 feet building to 3 to
5 feet. 
.monday...west winds 15 to 20 knots becoming southwest 5 to
15 knots. waves 3 to 5 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.

$$