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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est fri dec 5 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 30.1 inch high centered along the new england 
coastline this evening will push off the coast overnight. another 
cold front will cross the lake saturday night, 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 will approach the region tuesday night and potentially 
move northwest of the lake wednesday.


loz062-060400-
lake ontario open waters from the niagara river to hamlin beach-
402 pm est fri dec 5 2025

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

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est fri dec 5 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 30.1 inch high centered along the new england 
coastline this evening will push off the coast overnight. another 
cold front will cross the lake saturday night, 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 will approach the region tuesday night and potentially 
move northwest of the lake wednesday.


loz063-060400-
lake ontario open waters from hamlin beach to sodus bay-
402 pm est fri dec 5 2025

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

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est fri dec 5 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 30.1 inch high centered along the new england 
coastline this evening will push off the coast overnight. another 
cold front will cross the lake saturday night, 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 will approach the region tuesday night and potentially 
move northwest of the lake wednesday.


loz064-065-060400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est fri dec 5 2025

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

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est fri dec 5 2025


slz022-060400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est fri dec 5 2025

.tonight...south winds 5 to 15 knots. a chance of snow showers
late. 
.saturday...south winds 10 to 15 knots becoming southwest. a
chance of snow showers early, then lake effect snow showers
likely from late morning on. 
.saturday night...southwest winds 10 knots or less becoming
north. a chance of snow showers in the evening. 
.sunday...northeast winds less than 10 knots. snow likely in the
afternoon. 
.sunday night...northeast winds 10 knots or less becoming north.
snow likely. 
.monday...north winds 10 knots or less becoming south. partly
cloudy, then becoming mostly cloudy. 
.tuesday...south winds 5 to 15 knots becoming southwest. snow
showers likely. 
.wednesday...south winds 5 to 15 knots becoming southwest. snow
and rain showers. 

$$