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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt wed jul 22 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 29.3 inch low over northern quebec tonight will move 
northeast and into the north atlantic by thursday night. meanwhile, 
a 30.2 inch high will build into the upper great lakes tonight, then 
move east across the lower great lakes thursday. this high will 
linger from the lower great lakes to new england friday through 
saturday before weakening and drifting off the east coast sunday.


loz063>065-230300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt wed jul 22 2026

.tonight...west winds 15 to 20 knots diminishing to 5 to
15 knots. waves 4 to 7 feet subsiding to 1 to 2 feet. waves
occasionally around 9 feet. 
.thursday...west winds 5 to 15 knots. waves 1 to 3 feet. 
.thursday night...west winds 5 to 15 knots becoming southwest.
waves 2 feet or less. 
.friday...south winds 5 to 10 knots becoming northeast. waves
1 foot or less. 
.friday night...east winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...south winds 5 to 15 knots. waves 2 feet or less. 
.sunday...southwest winds 5 to 15 knots becoming west 10 knots or
less. a chance of showers and thunderstorms. waves 2 feet or
less. 
.monday...west winds 10 knots or less becoming south. a chance of
showers. waves 1 foot or less. 

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
403 pm edt wed jul 22 2026


slz022-024-230300-
saint lawrence river from cape vincent to saint regis
403 pm edt wed jul 22 2026

.tonight...west winds 5 to 15 knots becoming southwest less than
10 knots. mostly cloudy this evening, then becoming partly
cloudy. 
.thursday...southwest winds 10 knots or less increasing to 10 to
15 knots. sunny.
.thursday night...southwest winds 10 knots or less. mainly clear.
.friday...southwest winds 10 knots or less. sunny.
.friday night...southwest winds less than 10 knots. mainly clear.
.saturday...south winds 10 knots or less. mainly clear, then
becoming mostly cloudy. 
.sunday...south winds 5 to 10 knots becoming light and variable.
a chance of showers and thunderstorms. 
.monday...southwest winds less than 10 knots becoming south. a
chance of showers and thunderstorms. 

winds and waves higher in and near thunderstorms.

$$