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open lake forecast for lake ontario
national weather service buffalo ny
402 am est sat dec 6 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 cold front will cross the lake this late afternoon and 
evening, while its associated 29.2 inch low remains stationary over 
hudson bay. a weak 30.0 inch surface low and trough will cross the 
lake on sunday afternoon and evening. another 30.4 inch high will 
move across the region monday through monday night, before moving 
off the east coast tuesday. a 29.5 inch low will move across the 
upper great lakes tuesday, then a stronger low averaging 29.3 inches 
will approach the region tuesday night and potentially move 
northwest of the lake wednesday.


loz062-061600-
lake ontario open waters from the niagara river to hamlin beach-
402 am est sat dec 6 2025

.today...southwest winds 20 to 25 knots becoming west. a chance
of snow showers. waves 3 to 6 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.tonight...west winds 15 to 20 knots becoming north 5 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.sunday...east winds 5 to 15 knots becoming north. snow. waves
1 to 2 feet. 
.sunday night...north winds 15 to 20 knots. snow in the evening,
then a chance of snow overnight. waves 2 to 4 feet. 
.monday...north winds 5 to 15 knots becoming south 15 to
20 knots. waves 1 to 3 feet. 
.tuesday...south winds to 30 knots becoming southwest and
diminishing to 15 to 20 knots. snow likely during the day, then
rain and snow likely tuesday night. waves 4 to 7 feet building to
5 to 9 feet, then subsiding to 4 to 7 feet. waves occasionally
around 11 feet. 
.wednesday...south winds 15 to 25 knots becoming west to
30 knots. rain with snow likely during the day, then rain and
snow showers likely wednesday night. waves 3 to 6 feet building
to 5 to 8 feet. waves occasionally around 10 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am est sat dec 6 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 cold front will cross the lake this late afternoon and 
evening, while its associated 29.2 inch low remains stationary over 
hudson bay. a weak 30.0 inch surface low and trough will cross the 
lake on sunday afternoon and evening. another 30.4 inch high will 
move across the region monday through monday night, before moving 
off the east coast tuesday. a 29.5 inch low will move across the 
upper great lakes tuesday, then a stronger low averaging 29.3 inches 
will approach the region tuesday night and potentially move 
northwest of the lake wednesday.


loz063-061600-
lake ontario open waters from hamlin beach to sodus bay-
402 am est sat dec 6 2025

.today...southwest winds 15 to 25 knots becoming west. a chance
of snow showers. waves 3 to 6 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.tonight...west winds 15 to 25 knots becoming north and
diminishing to 10 to 15 knots. a chance of snow showers late in
the evening. waves 5 to 8 feet subsiding to 2 to 4 feet. waves
occasionally around 10 feet. 
.sunday...northeast winds 5 to 15 knots becoming southeast. a
chance of snow in the morning, then snow in the afternoon. waves
1 to 3 feet. 
.sunday night...north winds 15 to 20 knots. snow in the evening,
then a chance of snow overnight. waves 1 to 3 feet building to
3 to 5 feet. 
.monday...north winds 15 to 20 knots becoming south. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tuesday...south winds 15 to 25 knots becoming southwest. snow
likely during the day, then rain and snow likely tuesday night.
waves 2 to 4 feet building to 4 to 7 feet, then subsiding to 3 to
6 feet. waves occasionally around 9 feet. 
.wednesday...south winds 15 to 25 knots becoming west to
30 knots. rain with snow likely during the day, then rain and
snow showers likely wednesday night. waves 3 to 5 feet building
to 6 to 10 feet. waves occasionally around 13 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am est sat dec 6 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 cold front will cross the lake this late afternoon and 
evening, while its associated 29.2 inch low remains stationary over 
hudson bay. a weak 30.0 inch surface low and trough will cross the 
lake on sunday afternoon and evening. another 30.4 inch high will 
move across the region monday through monday night, before moving 
off the east coast tuesday. a 29.5 inch low will move across the 
upper great lakes tuesday, then a stronger low averaging 29.3 inches 
will approach the region tuesday night and potentially move 
northwest of the lake wednesday.


loz064-065-061600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est sat dec 6 2025

.today...southwest winds 15 to 25 knots. a chance of snow showers
this morning, then snow showers likely early this afternoon. snow
and rain showers likely late. waves 3 to 6 feet building to 5 to
8 feet. waves occasionally around 10 feet. 
.tonight...west winds 15 to 25 knots becoming north and
diminishing to 10 to 15 knots. a chance of rain and snow showers
early, then a chance of snow showers. waves 5 to 8 feet subsiding
to 2 to 4 feet. waves occasionally around 10 feet. 
.sunday...northeast winds 5 to 15 knots becoming east. a chance
of snow in the morning, then snow in the afternoon. waves 1 to
3 feet. 
.sunday night...north winds 15 to 20 knots. snow. waves 1 to
3 feet building to 3 to 5 feet. 
.monday...north winds 15 to 20 knots becoming south. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tuesday...south winds to 30 knots becoming southwest. snow
likely during the day, then rain and snow tuesday night. waves
3 to 6 feet building to 5 to 9 feet. waves occasionally around
11 feet. 
.wednesday...south winds to 30 knots becoming west. rain and snow
during the day, then rain and snow showers wednesday night. waves
3 to 6 feet building to 7 to 10 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 sat dec 6 2025


slz022-061600-
saint lawrence river from cape vincent to ogdensburg-
402 am est sat dec 6 2025

.today...south winds 10 to 15 knots becoming southwest. snow
showers likely early, then a chance of snow showers from late
morning on. 
.tonight...southwest winds 10 knots or less becoming north. a
chance of snow showers early. 
.sunday...northeast winds less than 10 knots. a chance of snow in
the morning, then snow likely in the afternoon. 
.sunday night...northeast winds 10 knots or less becoming
northwest. snow likely. 
.monday...northwest winds 10 knots or less becoming south. mainly
clear, then becoming mostly cloudy. 
.tuesday...south winds 5 to 15 knots. snow.
.wednesday...south winds 5 to 15 knots becoming west. snow and
rain during the day, then snow and rain showers wednesday night. 

$$