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open lake forecast for lake ontario
national weather service buffalo ny
1001 pm edt mon aug 17 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 
build over the lower great lakes tonight through tuesday, then drift 
to the eastern seaboard wednesday. a cold front will cross the lake 
wednesday before another 30.1 inch high builds into the great lakes 
thursday through friday.


loz063>065-180900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1001 pm edt mon aug 17 2026

.overnight...north winds 5 to 10 knots becoming northeast.
waves 2 feet or less. 
.tuesday...north winds 10 knots or less becoming west. waves
1 foot or less. 
.tuesday night...west winds 5 to 15 knots becoming southwest. a
chance of showers overnight. waves 2 feet or less. 
.wednesday...southwest winds 10 to 15 knots becoming west.
showers likely in the morning, then showers likely with a chance
of thunderstorms in the afternoon. waves 1 to 3 feet. 
.wednesday night...west winds 5 to 15 knots becoming northwest. a
chance of showers in the evening. waves 1 to 3 feet. 
.thursday...northwest winds 5 to 10 knots. waves 2 feet or less. 
.friday...northwest winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.saturday...south winds 5 to 15 knots. a chance of showers during
the day, then showers likely saturday 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
1001 pm edt mon aug 17 2026


slz022-024-180900-
saint lawrence river from cape vincent to saint regis
1001 pm edt mon aug 17 2026

.overnight...north winds less than 10 knots. patchy fog
late. 
.tuesday...north winds 10 knots or less becoming west. patchy fog
early. 
.tuesday night...southwest winds 10 knots or less becoming south.
a chance of showers overnight. 
.wednesday...south winds 5 to 10 knots becoming southwest.
showers in the morning, then showers with a chance of
thunderstorms in the afternoon. 
.wednesday night...southwest winds 5 to 10 knots becoming light
and variable. showers with a chance of thunderstorms in the
evening. 
.thursday...light and variable winds. becoming mainly clear. 
.friday...light and variable winds. mainly clear. 
.saturday...southeast winds less than 10 knots. a chance of
showers during the day, then showers likely saturday night. 

winds and waves higher in and near thunderstorms.

$$