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


slz022-024-122100-
saint lawrence river from cape vincent to saint regis
1003 am edt sun jul 12 2026

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

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am 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 continue to build south 
across the lower great lakes today, before sliding east into new 
england 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.


loz063>065-122100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt sun jul 12 2026

.this afternoon...northeast winds 10 knots or less becoming north.
waves 1 foot or less. 
.tonight...south winds less than 10 knots. waves 1 foot or less. 
.monday...southwest winds 5 to 10 knots becoming west. waves
1 foot or less. 
.monday night...southwest winds 5 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet. 
.tuesday...southwest winds 15 to 25 knots becoming west. waves
3 to 6 feet building to 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. 

$$