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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt mon aug 10 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 warm front sweeps northeastward across lake ontario 
this morning, followed by a cold front crossing the lake late this 
evening. behind the cold front, a trough averaging 29.8 inches will 
linger over the eastern great lakes through thursday. a cold front 
sweeps across the lake thursday night, with a 30.2 inch high 
pressure ridge building in from the upper great lakes on friday.


loz063>065-101500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt mon aug 10 2026

.today...south winds 10 to 15 knots becoming west. a chance of
showers this morning, then a chance of showers and thunderstorms
this afternoon. waves 1 to 3 feet. 
.tonight...west winds 10 to 15 knots becoming northwest. a chance
of showers and thunderstorms in the evening. waves 1 to 3 feet. 
.tuesday...northwest winds 5 to 15 knots becoming west. waves
1 to 3 feet. 
.tuesday night...west winds 10 knots or less becoming northwest.
waves 2 feet or less. 
.wednesday...west winds 10 knots or less. a chance of showers
wednesday night. waves 1 foot or less. 
.thursday...northwest winds 5 to 15 knots. a chance of showers
during the day. waves 1 to 2 feet. 
.friday...north winds 5 to 10 knots. 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
403 am edt mon aug 10 2026


slz022-024-101500-
saint lawrence river from cape vincent to saint regis
403 am edt mon aug 10 2026

.today...south winds 10 knots or less becoming southwest. a
chance of showers and thunderstorms early this afternoon. showers
likely with a chance of thunderstorms late. 
.tonight...southwest winds 10 knots or less becoming west.
showers likely with a chance of thunderstorms in the evening. 
.tuesday...west winds 10 knots or less. mostly sunny. 
.tuesday night...west winds less than 10 knots. partly cloudy. 
.wednesday...light and variable winds. a chance of showers
wednesday night. 
.thursday...west winds 10 knots or less becoming northwest.
showers likely with a chance of thunderstorms. 
.friday...northwest winds 5 to 10 knots becoming light and
variable. becoming mainly clear. 

winds and waves higher in and near thunderstorms.

$$