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open lake forecast for lake ontario
national weather service buffalo ny
1002 am est tue nov 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...a 28.8 inch low over labrador this late morning will 
continue to move northeast towards the north atlantic tonight 
through wednesday. a 30.2 inch high centered over the upper great 
lakes today will build to the lower great lakes wednesday and to new 
england thursday. a 29.5 inch surface low along the southern 
shoreline of hudson bay will swing a cold front east across the 
lower great lakes friday, followed by a 30.0 inch high building over 
the ohio valley and lower great lakes saturday.


loz062-182200-
lake ontario open waters from the niagara river to hamlin beach-
1002 am est tue nov 18 2025

.this afternoon...northwest winds 5 to 15 knots becoming west.
waves 1 to 3 feet. 
.tonight...northwest winds 10 knots or less becoming north. waves
2 feet or less. 
.wednesday...north winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.wednesday night...north winds less than 10 knots becoming
southeast. waves 1 foot or less. 
.thursday...southeast winds 10 knots or less becoming southwest
10 to 15 knots. rain showers likely thursday night. waves 2 feet
or less. 
.friday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. rain showers likely during the day. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.saturday...northwest winds around 10 knots becoming west. waves
1 to 2 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am est tue nov 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...a 28.8 inch low over labrador this late morning will 
continue to move northeast towards the north atlantic tonight 
through wednesday. a 30.2 inch high centered over the upper great 
lakes today will build to the lower great lakes wednesday and to new 
england thursday. a 29.5 inch surface low along the southern 
shoreline of hudson bay will swing a cold front east across the 
lower great lakes friday, followed by a 30.0 inch high building over 
the ohio valley and lower great lakes saturday.


loz063-182200-
lake ontario open waters from hamlin beach to sodus bay-
1002 am est tue nov 18 2025

.this afternoon...northwest winds 10 to 15 knots becoming west.
waves 2 to 3 feet. 
.tonight...northwest winds 5 to 10 knots becoming north. waves
1 to 2 feet. 
.wednesday...north winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.wednesday night...northwest winds less than 10 knots. waves
1 foot or less. 
.thursday...southeast winds 10 knots or less becoming south 10 to
15 knots. rain showers likely thursday night. waves 1 foot or
less building to 1 to 3 feet. 
.friday...southwest winds 15 to 20 knots becoming northwest 10 to
15 knots. rain showers likely during the day, then a chance of
rain showers friday night. waves 2 to 4 feet building to 3 to
6 feet, then subsiding to 2 to 4 feet. 
.saturday...northwest winds 10 to 15 knots becoming west. waves
1 to 3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am est tue nov 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...a 28.8 inch low over labrador this late morning will 
continue to move northeast towards the north atlantic tonight 
through wednesday. a 30.2 inch high centered over the upper great 
lakes today will build to the lower great lakes wednesday and to new 
england thursday. a 29.5 inch surface low along the southern 
shoreline of hudson bay will swing a cold front east across the 
lower great lakes friday, followed by a 30.0 inch high building over 
the ohio valley and lower great lakes saturday.


loz064-065-182200-
lake ontario open waters from sodus bay to the saint lawrence
river-
1002 am est tue nov 18 2025

.this afternoon...northwest winds 10 to 15 knots becoming west.
waves 1 to 3 feet. 
.tonight...west winds 5 to 10 knots becoming north. waves 1 to
3 feet subsiding to 1 foot or less. 
.wednesday...north winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.wednesday night...northwest winds less than 10 knots. waves
1 foot or less. 
.thursday...southeast winds 5 to 15 knots becoming south 15 to
20 knots. rain showers likely thursday night. waves 2 feet or
less building to 2 to 4 feet. 
.friday...southwest winds 15 to 20 knots becoming northwest 10 to
15 knots. rain showers during the day, then a chance of rain
showers friday night. waves 3 to 6 feet subsiding to 2 to 4 feet.
.saturday...northwest winds 5 to 15 knots becoming west. waves
1 to 3 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am est tue nov 18 2025


slz022-182200-
saint lawrence river from cape vincent to ogdensburg-
1002 am est tue nov 18 2025

.this afternoon...west winds 5 to 10 knots. mostly sunny. 
.tonight...west winds 10 knots or less becoming north. mainly
clear through the early overnight, then becoming partly cloudy. 
.wednesday...light and variable winds. sunny.
.wednesday night...light and variable winds. partly cloudy in the
evening, then becoming mostly cloudy. 
.thursday...light and variable winds becoming south 5 to
10 knots. rain showers likely thursday night. 
.friday...southwest winds 10 knots or less becoming west. rain
showers during the day, then a chance of rain showers friday
night. 
.saturday...west winds less than 10 knots becoming southwest.
mostly cloudy. 

$$