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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sun aug 9 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 30.2 inch high will ridge northward across the lower 
great lakes today. this ridge will begin to exit eastward, with a 
warm front crossing the lake later tonight, followed by a cold front 
monday night. behind the front, a trough averaging 29.8 inches will 
linger over the eastern great lakes through midweek, with another 
cold front forecast to sweep across the lake wednesday night.


loz063>065-092100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt sun aug 9 2026

.this afternoon...west winds 10 to 15 knots. waves 1 to 3 feet. 
.tonight...west winds 5 to 15 knots becoming south. a chance of
showers late. waves 2 feet or less. 
.monday...south winds 10 to 15 knots becoming west. showers
likely in the morning, then showers likely with a chance of
thunderstorms in the afternoon. waves 1 to 2 feet. 
.monday night...west winds 10 to 15 knots. a chance of showers
and thunderstorms in the evening. waves 1 to 2 feet. 
.tuesday...west winds 5 to 10 knots. waves 2 feet or less. 
.wednesday...west winds 10 knots or less. a chance of showers.
waves 1 foot or less. 
.thursday...west winds 5 to 15 knots becoming northwest. a chance
of showers. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt sun aug 9 2026


slz022-024-092100-
saint lawrence river from cape vincent to saint regis
1003 am edt sun aug 9 2026

.this afternoon...southwest winds 5 to 10 knots. sunny.
.tonight...southwest winds 10 knots or less becoming south.
partly cloudy in the evening, then becoming mostly cloudy. 
.monday...south winds 10 knots or less becoming southwest.
showers likely in the morning, then showers with a chance of
thunderstorms in the afternoon. 
.monday night...southwest winds less than 10 knots becoming west.
showers likely with a chance of thunderstorms in the evening,
then showers likely overnight. 
.tuesday...west winds less than 10 knots. partly cloudy. 
.wednesday...light and variable winds. a chance of showers. 
.thursday...west winds 10 knots or less. showers likely with a
chance of thunderstorms. 

winds and waves higher in and near thunderstorms.

$$