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open lake forecast for lake ontario
national weather service buffalo ny
1003 am edt fri jul 31 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...
high pressure averaging 30.0 inches will settle across the area this 
afternoon, before sliding east and off the new england coast over 
the weekend. a wavy cold front will then slowly push southeast 
across the lake sunday night and monday, with another 30.1 inch high 
then gradually building southeastward across the lake through the 
middle of next week.


loz063>065-312100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 am edt fri jul 31 2026

.this afternoon...west winds 5 to 10 knots. waves 1 foot or less. 
.tonight...southwest winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...south winds 10 knots or less becoming east. waves
1 foot or less. 
.saturday night...east winds 5 to 15 knots becoming southeast. a
chance of showers in the evening, then showers likely overnight.
waves 1 foot or less. 
.sunday...southeast winds 10 to 15 knots becoming southwest.
showers with a chance of thunderstorms. waves 2 feet or less. 
.monday...west winds 5 to 15 knots becoming northwest. a chance
of showers during the day. waves 2 feet or less. 
.tuesday...west winds 10 knots or less becoming southeast. 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 fri jul 31 2026


slz022-024-312100-
saint lawrence river from cape vincent to saint regis
1003 am edt fri jul 31 2026

.this afternoon...light and variable winds. sunny.
.tonight...southwest winds less than 10 knots becoming south.
mainly clear early, then becoming mostly cloudy. 
.saturday...south winds less than 10 knots becoming southwest.
partly sunny. 
.saturday night...light and variable winds. a chance of showers
in the evening, then showers likely overnight. 
.sunday...south winds 5 to 10 knots. showers with a chance of
thunderstorms. 
.monday...southwest winds 5 to 10 knots becoming light and
variable. showers likely with a chance of thunderstorms during
the day. 
.tuesday...west winds less than 10 knots. mainly clear, then
becoming partly cloudy. 

winds and waves higher in and near thunderstorms.

$$