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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt fri sep 11 2026


slz022-024-111500-
saint lawrence river from cape vincent to saint regis
403 am edt fri sep 11 2026

.today...northwest winds 10 knots or less becoming west. sunny.
.tonight...west winds 10 knots or less becoming south. mainly
clear through the early overnight, then becoming partly cloudy. 
.saturday...south winds 10 knots or less becoming southwest.
mostly sunny. 
.saturday night...south winds 5 to 15 knots. mostly cloudy. 
.sunday...southwest winds 5 to 10 knots becoming northwest.
showers likely. 
.monday...northwest winds 10 knots or less becoming southeast.
mainly clear, then becoming partly cloudy. 
.tuesday...south winds 10 to 15 knots becoming southwest. a
chance of showers during the day, then showers likely tuesday
night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt fri sep 11 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 high pressure ridge averaging 30.0 inches will 
build from the western great lakes today, before exiting toward the 
new england coast on saturday. a warm front will sweep northeastward 
across lake ontario saturday evening through saturday night before a 
cold front sweeps eastward across lake ontario on sunday. behind the 
cold front, a 30.1 inch ridge will slide eastward across the lake 
through monday. on tuesday, the ridge should exit toward new england 
and allow a warm front to sweep northeastward across lake ontario.


loz063>065-111500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt fri sep 11 2026

.today...north winds 5 to 10 knots becoming west. waves 2 feet or
less. 
.tonight...west winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...south winds 10 to 15 knots becoming southeast. waves
1 to 3 feet. 
.saturday night...south winds 15 to 20 knots becoming southwest.
a chance of showers. waves 1 to 3 feet building to 2 to 4 feet,
then subsiding to 1 to 3 feet. 
.sunday...southwest winds 10 to 15 knots becoming northwest 15 to
20 knots. a chance of showers during the day. waves 1 to 3 feet
building to 2 to 4 feet. 
.monday...north winds 5 to 15 knots becoming southeast 15 to
20 knots. waves 1 to 3 feet. 
.tuesday...south winds 15 to 25 knots becoming southwest. a
chance of showers during the day, then showers likely tuesday
night. waves 3 to 5 feet subsiding to 1 to 3 feet. 

$$