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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt wed oct 21 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 high pressure ridge averaging 30.4 inches exits slowly 
toward the canadian maritimes before a weak cold front sweeps 
southeastward across the lake on thursday. behind the front, another 
ridge averaging 30.5 inches affects the lake through this weekend as 
the embedded high pressure center moves southeastward across the 
great lakes through friday and then moves farther southeastward to 
atlantic waters near long island and new jersey by this sunday.


loz063>065-220300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt wed oct 21 2026

.tonight...north winds 10 knots or less becoming northwest. waves
1 foot or less. 
.thursday...northwest winds 5 to 15 knots becoming north. waves
1 to 3 feet. 
.thursday night...north winds 15 to 20 knots becoming northeast.
waves 2 to 4 feet building to 3 to 5 feet, then subsiding to 2 to
4 feet. 
.friday...northeast winds 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 1 foot or less. 
.saturday...southeast winds less than 10 knots becoming south
10 to 15 knots. waves 2 feet or less. 
.sunday...south winds 5 to 15 knots becoming southwest. waves
2 feet or less. 
.monday...southwest winds 5 to 15 knots becoming northeast 15 to
20 knots. waves 1 to 2 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt wed oct 21 2026


slz022-024-220300-
saint lawrence river from cape vincent to saint regis
403 pm edt wed oct 21 2026

.tonight...light and variable winds. mainly clear through the
early overnight, then becoming partly cloudy. 
.thursday...light and variable winds becoming north 5 to
10 knots. mostly sunny. 
.thursday night...north winds 5 to 10 knots. mainly clear. 
.friday...northeast winds less than 10 knots. sunny.
.friday night...light and variable winds. partly cloudy. 
.saturday...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. mostly
cloudy. 

$$