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open lake forecast for lake ontario
national weather service buffalo ny
1003 am edt tue aug 4 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 today and then exit slowly toward new england 
through saturday. a cold front should approach lake ontario slowly 
from the northwest thursday through saturday.


loz063>065-042100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 am edt tue aug 4 2026

.this afternoon...southwest winds 5 to 15 knots becoming north.
waves 1 foot or less. 
.tonight...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 2 feet or less. 
.wednesday night...southeast 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
and thunderstorms 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
1003 am edt tue aug 4 2026


slz022-024-042100-
saint lawrence river from cape vincent to saint regis
1003 am edt tue aug 4 2026

.this afternoon...southwest winds 5 to 10 knots. sunny.
.tonight...southwest winds 5 to 10 knots becoming light and
variable. mainly clear. 
.wednesday...south winds 10 knots or less becoming southwest.
sunny.
.wednesday night...light and variable winds. 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. a chance of showers
and thunderstorms. 
.saturday...southwest winds 10 knots or less. a chance of showers
and thunderstorms. 

winds and waves higher in and near thunderstorms.

$$