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open lake forecast for lake ontario
national weather service buffalo ny
1003 am edt sat may 30 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 30.2 inch high over northern ontario will build 
southeastward across the great lakes and ohio valley this weekend, 
with a 29.8 inch low then forecast to push south across new england 
sunday night and monday. another 30.3 inch high will then build 
south across the great lakes and ohio valley tuesday and wednesday.


loz063>065-302100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 am edt sat may 30 2026

.this afternoon...north winds 15 to 20 knots becoming northwest
10 to 15 knots. waves 3 to 5 feet subsiding to 1 to 2 feet. 
.tonight...northwest winds 5 to 10 knots becoming west. waves
2 feet or less. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
waves 1 to 3 feet building to 2 to 4 feet. 
.sunday night...west winds 15 to 20 knots becoming northwest 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.monday...north winds 10 knots or less becoming northwest. waves
1 foot or less. 
.tuesday...northwest winds 10 knots or less becoming north. waves
1 foot or less. 
.wednesday...north winds 10 knots or less becoming southwest.
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
1003 am edt sat may 30 2026


slz022-024-302100-
saint lawrence river from cape vincent to saint regis
1003 am edt sat may 30 2026

.this afternoon...northeast winds 15 to 20 knots diminishing to
5 to 15 knots. sunny.
.tonight...northeast winds less than 10 knots. mainly clear
through the early overnight, then becoming mostly cloudy. 
.sunday...light and variable winds becoming west 5 to 10 knots. a
chance of showers in the afternoon. 
.sunday night...west winds 5 to 10 knots becoming light and
variable. a chance of showers. 
.monday...north winds less than 10 knots. mainly clear. 
.tuesday...northwest winds less than 10 knots. partly cloudy. 
.wednesday...northeast winds less than 10 knots. mainly clear. 

$$