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open lake forecast for lake ontario
national weather service buffalo ny
403 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...
a high pressure ridge averaging 30.0 inches builds from the west 
today before exiting slowly eastward friday through sunday. a cold 
front should sweep southeastward across lake ontario sunday night 
through monday morning. behind the front, another ridge averaging 
30.0 inches should build southeastward across lake ontario through 
tuesday.


loz063>065-311500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt fri jul 31 2026

.today...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
403 am edt fri jul 31 2026


slz022-024-311500-
saint lawrence river from cape vincent to saint regis
403 am edt fri jul 31 2026

.today...light and variable winds. areas of fog this morning. 
.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.

$$