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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt tue aug 11 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 weak 29.9 inch high will settle across the lake today through 
wednesday morning, before a trough averaging 29.7 inches moves over 
the lake wednesday afternoon where it will linger through thursday. 
a cold front then sweeps across the lake thursday night, with a 30.2 
inch high pressure ridge building in from the upper great lakes on 
friday, settling over the lower great lakes region on saturday.


loz063>065-111500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt tue aug 11 2026

.today...northwest winds 5 to 10 knots becoming west. waves
2 feet or less. 
.tonight...west winds 10 knots or less becoming northwest. waves
2 feet or less. 
.wednesday...northwest winds 10 knots or less becoming west.
waves 1 foot or less. 
.wednesday night...northwest winds 5 to 10 knots. a chance of
showers. waves 1 foot or less. 
.thursday...northwest winds 5 to 15 knots. waves 2 feet or less. 
.friday...northwest winds 5 to 15 knots becoming north. waves
1 to 2 feet. 
.saturday...north winds 10 knots or less becoming south. waves
2 feet or less. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt tue aug 11 2026


slz022-024-111500-
saint lawrence river from cape vincent to saint regis
403 am edt tue aug 11 2026

.today...west winds less than 10 knots. mostly sunny. 
.tonight...west winds less than 10 knots. partly cloudy. 
.wednesday...light and variable winds. a chance of showers and
thunderstorms in the afternoon. 
.wednesday night...southwest winds less than 10 knots. a chance
of showers and thunderstorms in the evening, then a chance of
showers overnight. 
.thursday...west winds 10 knots or less becoming northwest.
showers likely with a chance of thunderstorms. 
.friday...northwest winds 10 knots or less. becoming mainly
clear. 
.saturday...northwest winds less than 10 knots. partly cloudy. 

winds and waves higher in and near thunderstorms.

$$