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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt tue aug 25 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 30.1 inch ridge will build from the western and 
central great lakes through wednesday. the ridge will exit eastward 
wednesday night through thursday morning and allow a warm front to 
sweep northeastward across lake ontario before a cold front sweeps 
eastward across the lake thursday evening and thursday night. behind 
the cold front, a high pressure ridge averaging 30.0 inches should 
build from the upper midwest through saturday and then begin to exit 
eastward sunday.


loz063>065-260300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt tue aug 25 2026

.tonight...west winds 10 knots or less. waves 2 feet or less. 
.wednesday...southwest winds 10 knots or less becoming east.
waves 1 foot or less. 
.wednesday night...east winds 5 to 15 knots becoming south 15 to
20 knots. showers and thunderstorms likely overnight. waves 1 to
3 feet building to 2 to 4 feet. 
.thursday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. showers and thunderstorms likely. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.thursday night...southwest winds 5 to 15 knots becoming west.
showers and thunderstorms likely in the evening, then a chance of
showers and thunderstorms overnight. waves 1 to 2 feet. 
.friday...northwest winds 5 to 10 knots becoming north. waves
2 feet or less. 
.saturday...northwest winds 10 knots or less becoming south.
waves 1 foot or less. 
.sunday...south winds 5 to 10 knots. a chance of showers sunday
night. waves 2 feet 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
402 pm edt tue aug 25 2026


slz022-024-260300-
saint lawrence river from cape vincent to saint regis
402 pm edt tue aug 25 2026

.tonight...west winds less than 10 knots. a chance of showers
early. patchy fog from late evening on. 
.wednesday...light and variable winds. patchy fog in the morning.
.wednesday night...south winds 10 knots or less. partly cloudy. 
.thursday...south winds 10 to 15 knots becoming southwest. a
chance of showers and thunderstorms in the morning, then showers
and thunderstorms likely in the afternoon. 
.thursday night...southwest winds 10 knots or less becoming west.
showers and thunderstorms likely in the evening, then a chance of
showers and thunderstorms overnight. 
.friday...northwest winds less than 10 knots. partly cloudy, then
becoming mainly clear. 
.saturday...light and variable winds. mainly clear. 
.sunday...southwest winds 10 knots or less. a chance of showers
sunday night. 

winds and waves higher in and near thunderstorms.

$$