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


slz022-024-130900-
saint lawrence river from cape vincent to saint regis
1003 pm edt fri jun 12 2026

.overnight...west winds 5 to 10 knots becoming southwest.
mainly clear. 
.saturday...southwest winds 5 to 10 knots. sunny.
.saturday night...southwest winds 5 to 10 knots becoming south. a
chance of showers overnight. 
.sunday...southwest winds 5 to 10 knots. a chance of showers in
the morning, then showers with a chance of thunderstorms in the
afternoon. 
.sunday night...southwest winds 5 to 10 knots. showers with a
chance of thunderstorms in the evening, then showers likely
overnight. 
.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. 
.wednesday...south winds 5 to 10 knots. a chance of showers. 

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 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 30.0 inch high will ridge across the lower great lakes 
tonight through sunday morning, then a cold front will crosses the 
region sunday afternoon and evening. 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 crossing the lake on tuesday. a 29.4 
inch low will then track north of the lake on wednesday, with its 
trailing cold front approaching the lake late in the day on 
wednesday.


loz063>065-130900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt fri jun 12 2026

.overnight...west winds 5 to 15 knots becoming southwest.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.saturday...west winds 5 to 15 knots. 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. showers
likely in the morning, then showers with a chance of
thunderstorms in the afternoon. waves 1 to 2 feet. 
.sunday night...west winds 10 to 15 knots increasing to 15 to
20 knots. showers with a chance of thunderstorms in the evening,
then a chance of showers overnight. waves 1 to 3 feet building to
3 to 6 feet. 
.monday...west winds 15 to 20 knots becoming southwest 5 to
15 knots. waves 3 to 6 feet subsiding to 1 to 2 feet. 
.tuesday...southwest winds 5 to 15 knots becoming south. waves
2 feet or less. 
.wednesday...south winds 5 to 15 knots increasing to 15 to
20 knots. a chance of showers during the day, then showers likely
wednesday night. waves 2 feet or less building to 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$