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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu sep 18 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...high pressure averaging 30.0 inches draped from the ohio 
valley to new england will gradually weaken in place today. a weak 
cold front will then cross the lake this evening, with another 30.4 
inch high then settling from central ontario to new england friday 
through saturday night, then off the new england coast sunday and 
monday.


loz063>065-181500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt thu sep 18 2025

.today...southwest winds 5 to 10 knots becoming west. waves
2 feet or less. 
.tonight...west winds 5 to 15 knots becoming north 15 to
20 knots. a chance of sprinkles from late evening on. waves 1 to
3 feet building to 2 to 4 feet. 
.friday...north winds 15 to 20 knots diminishing to 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday night...north winds 10 to 15 knots becoming northeast
15 to 20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday...northeast winds 15 to 20 knots becoming southeast
10 to 15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.sunday...southeast winds 15 to 20 knots becoming south. waves
1 to 3 feet building to 2 to 4 feet. 
.monday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. a chance of showers. waves 2 to 4 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 am edt thu sep 18 2025


slz022-024-181500-
saint lawrence river from cape vincent to saint regis
402 am edt thu sep 18 2025

.today...southwest winds 10 knots or less becoming west. mostly
sunny. 
.tonight...northwest winds 10 knots or less becoming north. a
chance of sprinkles late in the evening. 
.friday...north winds 5 to 10 knots. sunny.
.friday night...north winds 5 to 10 knots becoming northeast.
mainly clear. 
.saturday...northeast winds 10 knots or less becoming east.
mainly clear. 
.sunday...southeast winds 5 to 10 knots becoming south. partly to
mostly cloudy. 
.monday...south winds 5 to 10 knots becoming southwest. a chance
of showers during the day, then showers likely monday night. 

$$