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open lake forecast for lake ontario
national weather service buffalo ny
1003 am 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 today. 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>065-012100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 am edt sat aug 1 2026

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


slz022-024-012100-
saint lawrence river from cape vincent to saint regis
1003 am edt sat aug 1 2026

.this afternoon...southwest winds 10 knots or less. mostly cloudy,
then becoming partly sunny. 
.tonight...light and variable winds. showers likely after
midnight. a chance of showers late. 
.sunday...south winds less than 10 knots becoming southeast.
showers likely in the morning, then showers with a chance of
thunderstorms in the afternoon. 
.sunday night...southeast winds 5 to 10 knots becoming southwest.
showers with a chance of thunderstorms in the evening, then
showers overnight. 
.monday...northwest winds 10 knots or less. showers likely during
the day. 
.tuesday...north winds less than 10 knots. a chance of showers
and thunderstorms tuesday night. 
.wednesday...south winds less than 10 knots. a chance of showers
and thunderstorms. 

winds and waves higher in and near thunderstorms.

$$