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open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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 near the northern labrador/quebec border 
will 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. a weak 29.7 inch 
wave of low pressure will then move across ontario province and the 
lower lakes on sunday.


loz063-190400-
lake ontario open waters from hamlin beach to sodus bay-
402 pm est tue nov 18 2025

.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. waves 1 foot or
less. 
.thursday night...south winds 5 to 15 knots becoming southwest. a
chance of showers overnight. waves 2 feet or less. 
.friday...southwest winds 15 to 20 knots becoming northwest 10 to
15 knots. a chance of rain showers during the day. waves 2 to
4 feet building to 3 to 5 feet, then subsiding to 2 to 4 feet. 
.saturday...northwest winds 5 to 10 knots becoming southwest.
waves 1 to 3 feet. 
.sunday...southwest winds 10 to 15 knots becoming west. waves
1 to 3 feet. 

$$

fzus61 kbuf 182102
glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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 near the northern labrador/quebec border 
will 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. a weak 29.7 inch 
wave of low pressure will then move across ontario province and the 
lower lakes on sunday.


loz064-065-190400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est tue nov 18 2025

.tonight...northwest 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 10 knots. waves 1 foot or less. 
.thursday night...southeast winds 5 to 15 knots becoming south
15 to 20 knots. showers likely overnight. waves 1 to 3 feet. 
.friday...southwest winds 15 to 20 knots becoming northwest 10 to
15 knots. rain showers during the day. waves 3 to 6 feet
subsiding to 2 to 4 feet. 
.saturday...northwest winds 5 to 10 knots becoming southwest.
waves 1 to 3 feet. 
.sunday...southwest winds 10 to 15 knots becoming west. a chance
of rain showers sunday night. 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
402 pm est tue nov 18 2025


slz022-190400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est tue nov 18 2025

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

$$

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


slz024-190400-
saint lawrence river from ogdensburg to saint regis-
402 pm est tue nov 18 2025

.tonight...west winds 10 knots or less becoming northwest. partly
cloudy. 
.wednesday...northwest winds less than 10 knots becoming west.
mostly sunny. 
.wednesday night...light and variable winds. partly cloudy in the
evening, then becoming mostly cloudy. 
.thursday...light and variable winds. partly to mostly sunny. 
.thursday night...light and variable winds. rain showers likely
overnight. 
.friday...south winds 10 knots or less becoming west. rain
showers during the day. 
.saturday...west winds less than 10 knots. partly to mostly
cloudy. 
.sunday...south winds less than 10 knots becoming west. a chance
of rain showers sunday night. 

$$