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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt thu oct 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 30.5 inch high will build east across quebec tonight 
through friday, then settle across new england saturday through 
sunday before drifting off the east coast by monday. a cold front 
will then move southeast across the lake monday. another 30.5 inch 
high is then forecast to build from northwest ontario province 
monday night to the lower great lakes and new england by tuesday 
night.


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

.tonight...northeast winds 15 to 20 knots. waves 1 to 3 feet
building to 3 to 5 feet. 
.friday...northeast winds 15 to 20 knots diminishing to 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday night...northeast winds 10 knots or less becoming
southeast. waves 2 feet or less. 
.saturday...south winds less than 10 knots becoming east. waves
1 foot or less. 
.saturday night...east winds 10 knots or less becoming south.
waves 1 foot or less. 
.sunday...south winds 5 to 15 knots becoming southwest. waves
2 feet or less. 
.monday...west winds 5 to 10 knots becoming north and increasing
to 15 to 20 knots. waves 1 to 2 feet building to 2 to 4 feet. 
.tuesday...northeast winds 15 to 20 knots becoming east 5 to
15 knots. waves 2 to 4 feet subsiding to 1 foot or less. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt thu oct 22 2026


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

.tonight...north winds 5 to 15 knots becoming northeast. becoming
mainly clear. 
.friday...northeast winds 10 knots or less. sunny.
.friday night...northeast winds less than 10 knots. partly to
mostly cloudy. 
.saturday...light and variable winds. sunny.
.saturday night...light and variable winds. mainly clear. 
.sunday...south winds 10 knots or less becoming southwest. mainly
clear, then becoming partly cloudy. 
.monday...southwest winds 10 knots or less becoming north. partly
to mostly cloudy. 
.tuesday...north winds 5 to 10 knots becoming light and variable.
mainly clear. 

$$