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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sun oct 11 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 30.1 inches 
continues to slowly exit eastward and briefly replaced by a weak 
trough averaging 29.8 inches. behind the trough, a weak ridge 
averaging 29.9 inches slides eastward across the lake on monday, 
exits eastward monday night, and is followed by a cold front 
sweeping southeastward across the lake on tuesday. behind the cold 
front, a ridge averaging 30.2 inches builds from northern ontario 
through thursday. a 29.9 inch low may move across the great lakes 
region friday. this low has the potential to deepen into a stronger 
low.


loz063>065-120300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt sun oct 11 2026

.tonight...southeast winds 10 knots or less becoming south. rain
likely this evening, then a chance of rain after midnight. waves
2 feet or less. 
.monday...west winds 10 knots or less. waves 1 foot or less. 
.monday night...southwest winds 5 to 15 knots becoming south. a
chance of showers overnight. waves 2 feet or less. 
.tuesday...south winds 10 to 15 knots becoming southwest. showers
likely in the morning, then showers with a chance of
thunderstorms in the afternoon. waves 1 to 3 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming
northwest 10 to 15 knots. showers with a chance of thunderstorms
in the evening, then showers likely overnight. waves 1 to 3 feet
building to 2 to 4 feet. 
.wednesday...northwest winds 10 to 15 knots becoming north 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.thursday...north winds 15 to 20 knots becoming southeast.
showers likely thursday night. waves 2 to 4 feet subsiding to
1 to 3 feet. 
.friday...south winds 15 to 25 knots becoming northwest and
increasing to 35 knot gales. showers likely. waves 3 to 6 feet
building to 9 to 13 feet. waves occasionally around 16 feet. 

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 sun oct 11 2026


slz022-024-120300-
saint lawrence river from cape vincent to saint regis
403 pm edt sun oct 11 2026

.tonight...south winds less than 10 knots. a chance of rain late
this evening. patchy fog after midnight. 
.monday...southwest winds less than 10 knots becoming west. a
chance of showers late. 
.monday night...northeast winds 10 knots or less becoming east.
showers.
.tuesday...east winds 5 to 10 knots becoming south. showers in
the morning, then showers with a chance of thunderstorms in the
afternoon. 
.tuesday night...southwest winds 5 to 10 knots becoming
northwest. showers with a chance of thunderstorms in the evening,
then showers likely overnight. 
.wednesday...northwest winds 10 knots or less. mostly cloudy. 
.thursday...northwest winds 10 knots or less becoming east. a
chance of rain showers thursday night. 
.friday...southeast winds 10 to 15 knots becoming northwest 15 to
20 knots. rain showers. 

winds and waves higher in and near thunderstorms.

$$