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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt sat aug 1 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 of high pressure averaging 30.0 inches will 
drift off the mid atlantic this evening. an elongated 29.7 inch low 
will move from the ohio valley sunday to the lower great lakes 
sunday night, with a remnant trough drifting towards new england 
monday. a 30.0 inch high will then build east across ontario and 
quebec monday through tuesday.


loz063>065-020300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt sat aug 1 2026

.tonight...east winds 5 to 10 knots becoming southeast. a chance
of showers after midnight. waves 1 foot or less. 
.sunday...southeast winds 5 to 10 knots becoming south. showers
in the morning, then showers with a chance of thunderstorms in
the afternoon. waves 2 feet or less. 
.sunday night...southeast winds 5 to 15 knots becoming east.
showers with a chance of thunderstorms in the evening, then
showers overnight. waves 2 feet or less. 
.monday...north winds 5 to 10 knots becoming west. a chance of
showers in the morning. waves 2 feet or less. 
.monday night...west winds 5 to 10 knots becoming north. waves
1 foot or less. 
.tuesday...northeast winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.wednesday...southeast winds 5 to 10 knots becoming southwest. a
chance of showers and thunderstorms. waves 1 foot or less. 
.thursday...southwest winds 5 to 10 knots. a chance of showers.
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 sat aug 1 2026


slz022-024-020300-
saint lawrence river from cape vincent to saint regis
403 pm edt sat aug 1 2026

.tonight...south winds less than 10 knots. a chance of showers
after midnight. 
.sunday...southeast winds less than 10 knots becoming south. a
chance of showers early, then showers late in the morning.
showers with a chance of thunderstorms in the afternoon. 
.sunday night...south winds 10 knots or less. showers with a
chance of thunderstorms in the evening, then showers overnight. 
.monday...west winds 10 knots or less becoming northwest. showers
likely in the morning, then a chance of showers in the afternoon.
.monday night...northwest winds less than 10 knots. mainly clear.
.tuesday...light and variable winds. mainly clear, then becoming
partly cloudy. 
.wednesday...southeast winds less than 10 knots. a chance of
showers and thunderstorms during the day, then showers likely
with a chance of thunderstorms wednesday night. 
.thursday...southwest winds 10 knots or less. showers likely with
a chance of thunderstorms during the day, then a chance of
showers and thunderstorms thursday night. 

winds and waves higher in and near thunderstorms.

$$