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open lake forecast for lake ontario
national weather service buffalo ny
402 am est tue dec 9 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 29.5 inch surface low will move across the upper great 
lakes tuesday, then a stronger low averaging 29.2 inches will 
approach the region tuesday night and potentially move northwest of 
the lake wednesday. a 29.9 inch high is expected to move into the 
great lakes region thursday, followed by a 29.6 inch low which may 
approach the lake from the northwest late friday. 30.0 inches will 
average across the lower great lakes region saturday.


loz064-065-091600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est tue dec 9 2025

.today...south winds 15 to 25 knots increasing to 30 knots. a
chance of snow showers early. snow likely late. waves 2 to 4 feet
building to 4 to 7 feet. waves occasionally around 9 feet. 
.tonight...south winds to 30 knots. a chance of snow through the
early overnight, then snow likely with a chance of rain late.
waves 5 to 8 feet. waves occasionally around 10 feet. 
.wednesday...south winds 20 to 25 knots becoming southwest. rain
and snow. waves 3 to 6 feet building to 4 to 7 feet. waves
occasionally around 9 feet. 
.wednesday night...west winds to 30 knots becoming northwest.
snow showers and rain in the evening, then snow showers
overnight. waves 5 to 9 feet. waves occasionally around 11 feet. 
.thursday...west winds to 30 knots becoming northwest 15 to
25 knots. snow showers likely during the day, then a chance of
snow showers thursday night. waves 7 to 10 feet subsiding to 5 to
8 feet. waves occasionally around 13 feet. 
.friday...northwest winds 15 to 20 knots becoming southwest. a
chance of snow showers during the day, then snow showers likely
friday night. waves 4 to 7 feet subsiding to 2 to 4 feet. waves
occasionally around 9 feet. 
.saturday...southwest winds to 30 knots becoming west and
diminishing to 15 to 20 knots. snow showers likely. waves 5 to
8 feet building to 7 to 10 feet, then subsiding to 5 to 8 feet.
waves occasionally around 13 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est tue dec 9 2025


slz022-091600-
saint lawrence river from cape vincent to ogdensburg-
402 am est tue dec 9 2025

.today...south winds 5 to 15 knots. a chance of snow late. 
.tonight...south winds 15 to 20 knots diminishing to 10 to
15 knots. lake effect snow showers likely through the early
overnight, then snow likely late. 
.wednesday...south winds 5 to 10 knots. snow in the morning, then
rain and snow in the afternoon. 
.wednesday night...southwest winds 5 to 15 knots becoming west.
snow and rain in the evening, then snow showers overnight. 
.thursday...west winds 5 to 10 knots. snow showers likely. 
.friday...west winds 10 knots or less becoming south. a chance of
snow showers friday night. 
.saturday...southwest winds 5 to 10 knots becoming west. snow
showers likely during the day, then a chance of snow showers
saturday night. 

$$