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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1004 am edt wed may 27 2026


slz022-024-272100-
saint lawrence river from cape vincent to saint regis
1004 am edt wed may 27 2026

.this afternoon...north winds 5 to 10 knots becoming northwest.
mostly sunny. 
.tonight...northwest winds 10 knots or less becoming north.
partly to mostly cloudy. 
.thursday...north winds 5 to 10 knots becoming northwest. partly
to mostly sunny. 
.thursday night...northwest winds 5 to 10 knots becoming light
and variable. mostly cloudy. 
.friday...southwest winds 5 to 15 knots becoming north. showers
likely. 
.saturday...north winds 10 to 15 knots becoming light and
variable. becoming mainly clear. 
.sunday...west winds 10 knots or less becoming northwest. a
chance of showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1003 am edt wed may 27 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 cold front associated with a 29.8 inch low over new 
england will drop south across the lake this morning. a 30.2 inch 
high over ontario will expand southeastward across the lower great 
lakes thursday and thursday night, before settling into the ohio 
valley friday. a 29.6 inch low will then make its way southeastward 
across quebec friday and new england friday night and saturday, with 
its trailing cold front crossing the lake late friday or friday 
night. another 30.2 inch high is then forecast to build across the 
great lakes later saturday through sunday.


loz062-272100-
lake ontario open waters from the niagara river to hamlin beach-
1003 am edt wed may 27 2026

.this afternoon...west winds 5 to 10 knots. waves 1 foot or less. 
.tonight...west winds 10 to 15 knots becoming north. waves 2 feet
or less. 
.thursday...north winds 5 to 10 knots becoming west. waves 2 feet
or less. 
.thursday night...west winds 5 to 10 knots. waves 1 to 2 feet. 
.friday...west winds 10 to 15 knots becoming north 15 to
20 knots. waves 1 to 2 feet building to 3 to 5 feet, then
subsiding to 2 to 4 feet. 
.saturday...north winds 5 to 15 knots becoming northwest less
than 10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.sunday...west winds 5 to 10 knots becoming northwest. waves
2 feet or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1003 am edt wed may 27 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 cold front associated with a 29.8 inch low over new 
england will drop south across the lake this morning. a 30.2 inch 
high over ontario will expand southeastward across the lower great 
lakes thursday and thursday night, before settling into the ohio 
valley friday. a 29.6 inch low will then make its way southeastward 
across quebec friday and new england friday night and saturday, with 
its trailing cold front crossing the lake late friday or friday 
night. another 30.2 inch high is then forecast to build across the 
great lakes later saturday through sunday.


loz063>065-272100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 am edt wed may 27 2026

.this afternoon...northwest winds 5 to 15 knots becoming west.
waves 1 to 2 feet. 
.tonight...west winds 5 to 15 knots becoming north. waves 2 feet
or less. 
.thursday...north winds 5 to 15 knots becoming west. waves 2 feet
or less. 
.thursday night...west winds 5 to 10 knots. waves 2 feet or less.
.friday...west winds 15 to 20 knots becoming northwest. a chance
of showers friday night. waves 1 to 3 feet building to 3 to
6 feet. 
.saturday...north winds 15 to 20 knots becoming northwest 5 to
15 knots. waves 3 to 5 feet subsiding to 1 foot or less. 
.sunday...west winds 5 to 15 knots becoming northwest. waves
2 feet or less. 

$$