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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt sun jul 12 2026


slz022-024-130900-
saint lawrence river from cape vincent to saint regis
1003 pm edt sun jul 12 2026

.overnight...light and variable winds. mainly clear, then
becoming partly cloudy. 
.monday...southwest winds 10 knots or less. mostly sunny. 
.monday night...southwest winds 5 to 10 knots. partly to mostly
cloudy. 
.tuesday...southwest winds 10 to 15 knots. mostly sunny. 
.tuesday night...southwest winds 15 to 20 knots becoming west
5 to 15 knots. a chance of showers and thunderstorms. 
.wednesday...west winds 10 knots or less becoming northwest.
becoming mainly clear. 
.thursday...northwest winds 10 knots or less. mainly clear, then
becoming partly cloudy. 
.friday...northwest winds less than 10 knots becoming southwest.
partly cloudy. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sun jul 12 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 large 30.2 inch high will slide east into new england 
through monday, then off the coast by tuesday. this will allow a 
warm front to sweep across the lake tuesday, followed by a cold 
front pushing south across the lake on wednesday, trailed by a 
secondary cold front pushing south across the lake thursday into 
friday.


loz063>065-130900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt sun jul 12 2026

.overnight...southwest winds less than 10 knots. waves
1 foot or less. 
.monday...southwest winds 5 to 10 knots. waves 2 feet or less. 
.monday night...southwest winds 5 to 15 knots. waves 1 to 3 feet.
.tuesday...southwest winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 6 feet. 
.tuesday night...southwest winds 15 to 25 knots becoming west.
waves 4 to 7 feet. waves occasionally around 9 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.thursday...northwest winds 5 to 15 knots. waves 1 to 3 feet. 
.friday...north winds 5 to 10 knots becoming west. a chance of
showers friday night. waves 2 feet or less. 

$$