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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt mon aug 10 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 will cross the lake late this evening. 
behind the cold front, a trough averaging 29.8 inches will linger 
over the eastern great lakes through thursday. a cold front sweeps 
across the lake thursday night, with a 30.2 inch high pressure ridge 
building in from the upper great lakes on friday.


loz063>065-110900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt mon aug 10 2026

.rest of tonight...southwest winds 15 to 20 knots becoming
northwest 10 to 15 knots. a chance of showers and thunderstorms
late this evening. waves 1 to 3 feet. 
.tuesday...west winds 5 to 10 knots. waves 2 feet or less. 
.tuesday night...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...west winds 5 to 10 knots. a chance of showers.
waves 1 foot or less. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of showers. waves 2 feet or less. 
.friday...north winds 5 to 15 knots becoming northeast. waves
2 feet or less. 
.saturday...north winds 10 knots or less becoming southeast.
waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt mon aug 10 2026


slz022-024-110900-
saint lawrence river from cape vincent to saint regis
1003 pm edt mon aug 10 2026

.rest of tonight...west winds 10 knots or less. a chance of
showers and thunderstorms late this evening. 
.tuesday...west winds less than 10 knots. mostly sunny. 
.tuesday night...west winds less than 10 knots. partly cloudy. 
.wednesday...light and variable winds becoming west 5 to
10 knots. a chance of showers and thunderstorms in the afternoon.
.wednesday night...southwest winds less than 10 knots. a chance
of showers. 
.thursday...southwest 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. mainly clear,
then becoming partly cloudy. 

winds and waves higher in and near thunderstorms.

$$