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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt mon aug 3 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 ridge averaging 30.0 inches builds eastward across the 
lake ontario region through tuesday and then exits slowly toward new 
england through saturday. a cold front should approach lake ontario 
slowly from the northwest this thursday through saturday.


loz063>065-040300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt mon aug 3 2026

.tonight...west winds 15 to 20 knots diminishing to 5 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.tuesday...west winds 5 to 10 knots becoming northwest. waves
2 feet or less. 
.tuesday night...east winds 10 knots or less becoming south.
waves 1 foot or less. 
.wednesday...south winds 5 to 15 knots becoming east less than
10 knots. waves 1 foot or less. 
.wednesday night...east winds 10 knots or less becoming south. a
chance of showers overnight. waves 1 foot or less. 
.thursday...south winds 5 to 10 knots becoming southwest. a
chance of showers and thunderstorms. waves 1 foot or less. 
.friday...west winds 10 knots or less becoming southwest. a
chance of showers and thunderstorms. waves 1 foot or less. 
.saturday...southwest winds 5 to 10 knots. a chance of showers
during the day. waves 1 foot 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
403 pm edt mon aug 3 2026


slz022-024-040300-
saint lawrence river from cape vincent to saint regis
403 pm edt mon aug 3 2026

.tonight...west winds 10 to 15 knots diminishing to less than
10 knots. becoming mainly clear. 
.tuesday...southwest winds 10 knots or less. sunny.
.tuesday night...southwest winds less than 10 knots. mainly
clear. 
.wednesday...south winds 10 knots or less becoming southwest.
sunny.
.wednesday night...southwest winds less than 10 knots. mainly
clear in the evening, then becoming partly cloudy. 
.thursday...south winds 10 knots or less becoming southwest.
showers likely with a chance of thunderstorms. 
.friday...southwest winds less than 10 knots. showers likely with
a chance of thunderstorms. 
.saturday...southwest winds 10 knots or less. becoming mainly
clear. 

winds and waves higher in and near thunderstorms.

$$