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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt sun oct 18 2026


slz022-024-181500-
saint lawrence river from cape vincent to saint regis
403 am edt sun oct 18 2026

.today...southwest winds 5 to 15 knots. sunny.
.tonight...southwest winds 5 to 15 knots. mainly clear. 
.monday...southwest winds 5 to 10 knots. sunny.
.monday night...southwest winds less than 10 knots. mainly clear.
.tuesday...northeast winds 10 knots or less. mainly clear. 
.wednesday...northeast winds less than 10 knots. mainly clear. 
.thursday...light and variable winds becoming north 5 to
10 knots. becoming mainly clear. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sun oct 18 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 ridge averaging 30.2 inches affects the lake through 
this thursday. one embedded high pressure center should wobble 
northeastward from the southern great plains to near newfoundland 
through tonight. another embedded and reinforcing high pressure 
center should move from near the border of the north-central united 
states and canada to near the canadian maritimes this monday through 
wednesday. a third embedded and reinforcing high pressure center 
should move eastward from the canadian prairies to near the border 
of ontario and quebec this wednesday through thursday.


loz062-181500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt sun oct 18 2026

.today...southwest winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 5 feet. 
.tonight...southwest winds 15 to 20 knots diminishing to 10 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.monday...southwest winds 5 to 10 knots becoming west. waves
2 feet or less. 
.monday night...west winds 10 knots or less becoming northeast.
waves 1 foot or less. 
.tuesday...northeast winds 5 to 15 knots. waves 2 feet or less. 
.wednesday...east winds 5 to 10 knots becoming light and
variable. waves 2 feet or less. 
.thursday...northwest winds less than 10 knots becoming northeast
10 to 15 knots. waves 1 foot or less building to 1 to 3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sun oct 18 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 ridge averaging 30.2 inches affects the lake through 
this thursday. one embedded high pressure center should wobble 
northeastward from the southern great plains to near newfoundland 
through tonight. another embedded and reinforcing high pressure 
center should move from near the border of the north-central united 
states and canada to near the canadian maritimes this monday through 
wednesday. a third embedded and reinforcing high pressure center 
should move eastward from the canadian prairies to near the border 
of ontario and quebec this wednesday through thursday.


loz063>065-181500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sun oct 18 2026

.today...southwest winds 15 to 20 knots. waves 2 to 4 feet. 
.tonight...southwest winds 10 to 15 knots. waves 1 to 3 feet. 
.monday...southwest winds 5 to 15 knots becoming west. waves 1 to
3 feet. 
.monday night...west winds 10 knots or less becoming north 10 to
15 knots. waves 2 feet or less. 
.tuesday...northeast winds 10 to 15 knots. waves 1 to 3 feet. 
.wednesday...northeast winds 10 knots or less becoming north.
waves 2 feet or less. 
.thursday...north winds 10 knots or less becoming northeast and
increasing to 15 to 20 knots. waves 2 feet or less building to
2 to 4 feet. 

$$