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open lake forecast for lake ontario
national weather service buffalo ny
401 am edt sat jul 4 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 weak cold front will settle south across the lake 
this afternoon. a 30.2 inch high will then build from hudson bay 
today to quebec and northern new england sunday night. a weak 29.9 
inch low will then develop over ohio late sunday and move to the 
mid atlantic by late monday. a broad 30.1 inch high is then forecast 
to build into the great lakes tuesday through wednesday.


loz063>065-041500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
401 am edt sat jul 4 2026

.today...west winds 10 knots or less. a chance of showers and
thunderstorms this morning, then showers likely with a chance of
thunderstorms this afternoon. waves 1 foot or less. 
.tonight...northwest winds less than 10 knots becoming northeast.
waves 1 foot or less. 
.sunday...northeast winds 5 to 10 knots. waves 1 foot or less. 
.sunday night...northeast winds 5 to 10 knots becoming east.
waves 2 feet or less. 
.monday...east winds 5 to 15 knots. a chance of showers. waves
2 feet or less. 
.tuesday...east winds 10 knots or less becoming south. a chance
of showers. waves 1 foot or less. 
.wednesday...southwest winds 10 knots or less. 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
401 am edt sat jul 4 2026


slz022-024-041500-
saint lawrence river from cape vincent to saint regis
401 am edt sat jul 4 2026

.today...west winds 10 knots or less becoming northwest. a chance
of showers early this afternoon. 
.tonight...northwest winds less than 10 knots. partly cloudy. 
.sunday...north winds less than 10 knots becoming northeast.
partly to mostly sunny. 
.sunday night...northeast winds 10 knots or less becoming east.
mostly cloudy. 
.monday...east winds less than 10 knots becoming southeast.
partly cloudy. 
.tuesday...east winds less than 10 knots. partly cloudy. 
.wednesday...southwest winds 10 knots or less. partly cloudy. 

$$