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


slz022-024-211500-
saint lawrence river from cape vincent to saint regis
403 am edt wed oct 21 2026

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

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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>065-211500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt wed oct 21 2026

.today...east winds 10 knots or less becoming north. waves 2 feet
or less. 
.tonight...north winds 10 knots or less becoming northwest. waves
1 foot or less. 
.thursday...north winds 5 to 15 knots. 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 becoming southeast less
than 10 knots. waves 2 to 4 feet subsiding to 2 feet or less. 
.saturday...south winds 10 knots or less increasing to 10 to
15 knots. waves 2 feet or less. 
.sunday...south winds 5 to 15 knots becoming southwest. waves
2 feet or less. 

$$