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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt wed sep 17 2025

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 30.3 inch high across quebec will drift east off the 
new england coast by tonight, while remaining ridged over the lake. 
a cold front will cross the lake thursday night, with another area 
of high pressure over western ontario builds southeast across the 
lower great lakes friday and saturday.


loz063>065-180300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt wed sep 17 2025

.tonight...east winds 10 knots or less becoming southwest. waves
1 foot or less. 
.thursday...southwest winds 5 to 15 knots becoming west. patchy
fog early. waves 2 feet or less. 
.thursday night...west winds 10 to 15 knots becoming north 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.friday...north winds 15 to 20 knots becoming northwest 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday night...northwest winds 5 to 15 knots becoming northeast.
waves 1 to 3 feet. 
.saturday...northeast winds 5 to 15 knots becoming southeast.
waves 1 to 3 feet. 
.sunday...southeast winds 10 to 15 knots becoming south 15 to
20 knots. a chance of showers sunday night. waves 2 to 4 feet
building to 3 to 5 feet. 
.monday...south winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers. waves 3 to 5 feet subsiding to
1 to 3 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm edt wed sep 17 2025


slz022-024-180300-
saint lawrence river from cape vincent to saint regis
402 pm edt wed sep 17 2025

.tonight...light and variable winds. partly cloudy. 
.thursday...southwest winds 5 to 10 knots becoming west. mostly
sunny. 
.thursday night...west winds 5 to 10 knots becoming north. partly
to mostly cloudy. 
.friday...north winds 5 to 10 knots. sunny.
.friday night...north winds 10 knots or less. mainly clear. 
.saturday...northeast winds less than 10 knots becoming east.
mainly clear. 
.sunday...southeast winds 5 to 15 knots becoming south. partly
cloudy. 
.monday...south winds 5 to 15 knots. a chance of showers. 

$$