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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est mon nov 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 28.8 low over the canadian maritimes will withdraw 
northward across labrador tonight and tuesday. a 30.3 inch high will 
build from the upper great lakes tuesday to the lower great lakes 
wednesday, then to new england thursday. a 29.6 inch low over 
northern ontario will then make its way to quebec friday, while 
pushing its trailing cold front across the lake. a 30.1 inch high 
is then forecast to build across the lower great lakes saturday.


loz062-180400-
lake ontario open waters from the niagara river to hamlin beach-
402 pm est mon nov 17 2025

.tonight...northwest winds 15 to 25 knots. waves 4 to 7 feet
subsiding to 3 to 6 feet. waves occasionally around 9 feet. 
.tuesday...west winds 15 to 20 knots diminishing to 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday night...northwest winds 5 to 10 knots becoming north.
waves 2 feet or less. 
.wednesday...northeast winds 5 to 10 knots becoming light and
variable. waves 1 foot or less. 
.wednesday night...light and variable winds. 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, then a chance of
rain showers friday night. waves 1 to 3 feet building 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
402 pm est mon nov 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 28.8 low over the canadian maritimes will withdraw 
northward across labrador tonight and tuesday. a 30.3 inch high will 
build from the upper great lakes tuesday to the lower great lakes 
wednesday, then to new england thursday. a 29.6 inch low over 
northern ontario will then make its way to quebec friday, while 
pushing its trailing cold front across the lake. a 30.1 inch high 
is then forecast to build across the lower great lakes saturday.


loz063-180400-
lake ontario open waters from hamlin beach to sodus bay-
402 pm est mon nov 17 2025

.tonight...northwest winds 15 to 25 knots. a chance of snow
showers through the early overnight. waves 5 to 9 feet subsiding
to 4 to 7 feet. waves occasionally around 11 feet. 
.tuesday...northwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 3 to 6 feet subsiding to 2 to 4 feet. 
.tuesday night...west 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...light and variable winds becoming southeast
5 to 10 knots. waves 1 foot or less. 
.thursday...southeast winds 5 to 10 knots becoming south and
increasing to 15 to 20 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. 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. 
.saturday...northwest winds 10 to 15 knots becoming west. a
chance of rain showers during the day. waves 2 to 4 feet
subsiding to 1 to 2 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est mon nov 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 28.8 low over the canadian maritimes will withdraw 
northward across labrador tonight and tuesday. a 30.3 inch high will 
build from the upper great lakes tuesday to the lower great lakes 
wednesday, then to new england thursday. a 29.6 inch low over 
northern ontario will then make its way to quebec friday, while 
pushing its trailing cold front across the lake. a 30.1 inch high 
is then forecast to build across the lower great lakes saturday.


loz064-065-180400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est mon nov 17 2025

.tonight...northwest winds 15 to 25 knots. waves 6 to 10 feet
subsiding to 5 to 8 feet. waves occasionally around 13 feet. 
.tuesday...northwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 4 to 7 feet subsiding to 1 to 3 feet. waves
occasionally around 9 feet. 
.tuesday night...west winds 5 to 10 knots becoming northwest.
waves 1 to 3 feet subsiding to 1 foot or less. 
.wednesday...northwest winds 10 knots or less. waves 1 foot or
less. 
.wednesday night...light and variable winds. 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. rain
showers during the day, then a chance of rain showers friday
night. waves 3 to 6 feet. 
.saturday...northwest winds 10 to 15 knots becoming west. a
chance of rain showers during the day. 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 pm est mon nov 17 2025


slz022-180400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est mon nov 17 2025

.tonight...west winds 5 to 15 knots. mostly cloudy. 
.tuesday...west winds 10 knots or less. mostly sunny. 
.tuesday night...west winds less than 10 knots. 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 5 to 10 knots becoming west. rain
showers during the day, then a chance of rain showers friday
night. 
.saturday...northwest winds 10 knots or less becoming southwest.
mostly cloudy. 

$$