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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt fri jul 3 2026


slz022-024-040900-
saint lawrence river from cape vincent to saint regis
1003 pm edt fri jul 3 2026

.overnight...southwest winds less than 10 knots becoming
west. partly cloudy. 
.saturday...northwest winds less than 10 knots. mostly sunny. 
.saturday night...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 less than 10 knots becoming east.
mostly cloudy. 
.monday...east winds less than 10 knots. a chance of showers. 
.tuesday...east winds less than 10 knots. a chance of showers. 
.wednesday...southwest winds 10 knots or less. partly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt fri jul 3 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 
tonight, followed by another weak cold front saturday evening. a 
30.2 inch high will then build from hudson bay saturday to quebec 
and northern new england sunday night. a weak 29.9 inch low will 
then develop over the upper ohio valley 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>065-040900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt fri jul 3 2026

.overnight...west winds 5 to 10 knots. a chance of showers
late. waves 1 to 2 feet. 
.saturday...west winds 10 knots or less. a chance of showers
through early afternoon. waves 1 foot or less. 
.saturday night...northwest winds 10 knots or less becoming east.
a chance of showers overnight. waves 1 foot or less. 
.sunday...east winds 5 to 10 knots becoming northeast. a chance
of showers. waves 1 foot or less. 
.sunday night...northeast winds 5 to 15 knots becoming east. a
chance of showers. waves 2 feet or less. 
.monday...east winds 5 to 10 knots. showers likely with a chance
of thunderstorms. waves 2 feet or less. 
.tuesday...east winds 10 knots or less becoming southwest. a
chance of showers. waves 1 foot or less. 
.wednesday...southwest winds 5 to 10 knots. waves 1 foot or less.

winds and waves higher in and near thunderstorms.

$$