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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt thu may 28 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 30.3 inch high over ontario will expand southeastward 
across the great lakes tonight, 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, with its trailing cold 
front crossing the lake late friday or friday night. another 30.2 
inch high will then build across the great lakes and ohio valley 
later saturday through sunday, with a 29.8 inch low forecast to push 
south across new england sunday night and monday.


loz063>065-290300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt thu may 28 2026

.tonight...west winds 5 to 10 knots. waves 2 feet or less. 
.friday...west winds 10 to 15 knots increasing to 15 to 25 knots.
a chance of showers late. waves 1 to 3 feet building to 3 to
6 feet. 
.friday night...northwest winds 15 to 25 knots becoming north. a
chance of showers in the evening. waves 4 to 7 feet subsiding to
3 to 6 feet. waves occasionally around 9 feet. 
.saturday...north winds 15 to 25 knots becoming northwest and
diminishing to 10 to 15 knots. waves 3 to 6 feet subsiding to
1 to 3 feet. 
.saturday night...northwest winds 10 knots or less becoming west.
waves 2 feet or less. 
.sunday...west winds 5 to 10 knots. waves 1 to 3 feet. 
.monday...northwest winds 5 to 10 knots. waves 2 feet or less. 
.tuesday...northwest winds 5 to 10 knots becoming north. waves
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 may 28 2026


slz022-024-290300-
saint lawrence river from cape vincent to saint regis
403 pm edt thu may 28 2026

.tonight...northwest winds 5 to 10 knots becoming light and
variable. partly cloudy this evening, then becoming mostly
cloudy. 
.friday...light and variable winds becoming west 10 to 15 knots.
showers likely in the afternoon. 
.friday night...northwest winds 15 to 20 knots becoming north.
showers.
.saturday...north winds 15 to 20 knots becoming northeast 5 to
15 knots. a chance of showers in the morning. 
.saturday night...east winds 10 knots or less becoming southwest.
mainly clear. 
.sunday...southwest winds 10 knots or less becoming northwest. a
chance of showers sunday night. 
.monday...north winds less than 10 knots. a chance of showers. 
.tuesday...north winds less than 10 knots. a chance of showers. 

$$