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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 30.4 inch high centered just east of the lake this 
morning will push farther east and off the coast today. another cold 
front will cross the lake late saturday and saturday night, this 
from a 29.3 inch low near northern james bay. a weak 29.9 inch 
surface low and trough will cross the lake on sunday afternoon and 
evening. another 30.4 inch high will quickly pass across the region 
monday night. a 29.8 inch wave will cross the region on tuesday.


loz062-051600-
lake ontario open waters from the niagara river to hamlin beach-
402 am est fri dec 5 2025

.today...south winds 10 to 15 knots becoming southwest. waves
1 to 3 feet. 
.tonight...southwest winds 15 to 25 knots. a chance of snow
showers late. waves 1 to 3 feet building to 3 to 6 feet. 
.saturday...southwest winds 20 to 25 knots becoming west. snow
likely. 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 3 to 6 feet subsiding to 1 to 3 feet. 
.sunday...northeast winds 5 to 15 knots becoming north 15 to
20 knots. snow. waves 1 to 3 feet building to 2 to 4 feet. 
.monday...north winds 15 to 20 knots becoming southwest. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...southwest winds 15 to 25 knots. 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. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 30.4 inch high centered just east of the lake this 
morning will push farther east and off the coast today. another cold 
front will cross the lake late saturday and saturday night, this 
from a 29.3 inch low near northern james bay. a weak 29.9 inch 
surface low and trough will cross the lake on sunday afternoon and 
evening. another 30.4 inch high will quickly pass across the region 
monday night. a 29.8 inch wave will cross the region on tuesday.


loz063-051600-
lake ontario open waters from hamlin beach to sodus bay-
402 am est fri dec 5 2025

.today...south winds 15 to 20 knots becoming southwest 10 to
15 knots. waves 1 to 3 feet. 
.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. waves 2 to 4 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 showers in the
evening. waves 5 to 8 feet subsiding to 2 to 4 feet. waves
occasionally around 10 feet. 
.sunday...northeast winds 10 to 15 knots becoming north 15 to
20 knots. snow likely. waves 2 to 4 feet building to 3 to 6 feet.
.monday...north winds 15 to 20 knots becoming southwest. waves
3 to 5 feet subsiding to 2 to 4 feet. 
.tuesday...south winds 15 to 25 knots becoming southwest. snow
showers likely. waves 3 to 6 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 30.4 inch high centered just east of the lake this 
morning will push farther east and off the coast today. another cold 
front will cross the lake late saturday and saturday night, this 
from a 29.3 inch low near northern james bay. a weak 29.9 inch 
surface low and trough will cross the lake on sunday afternoon and 
evening. another 30.4 inch high will quickly pass across the region 
monday night. a 29.8 inch wave will cross the region on tuesday.


loz064-065-051600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est fri dec 5 2025

.today...south winds 15 to 20 knots. waves 1 to 3 feet building
to 3 to 5 feet, then subsiding to 2 to 4 feet. 
.tonight...south winds 15 to 20 knots. waves 2 to 4 feet building
to 3 to 5 feet. 
.saturday...south winds 15 to 25 knots becoming west. a chance of
snow showers in the morning, then snow in the afternoon. 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 showers. waves
5 to 8 feet subsiding to 2 to 4 feet. waves occasionally around
10 feet. 
.sunday...northeast winds 10 to 15 knots becoming north and
increasing to 15 to 25 knots. snow. waves 1 to 3 feet building to
3 to 6 feet. 
.monday...north winds 15 to 20 knots becoming southwest. waves
3 to 5 feet subsiding to 2 to 4 feet. 
.tuesday...south winds 15 to 25 knots becoming southwest to
30 knots. snow showers. waves 3 to 6 feet building to 5 to
8 feet. waves occasionally around 10 feet. 

$$

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


slz022-051600-
saint lawrence river from cape vincent to ogdensburg-
402 am est fri dec 5 2025

.today...south winds 5 to 10 knots. partly sunny. 
.tonight...south winds 5 to 15 knots. mostly cloudy. 
.saturday...south winds 10 to 15 knots becoming southwest. snow
showers likely in the morning, then snow in the afternoon. 
.saturday night...southwest winds 10 knots or less becoming
north. snow in the evening. 
.sunday...northeast winds 10 knots or less becoming north. snow
likely. 
.monday...northwest winds 10 knots or less becoming south. mainly
clear, then becoming partly cloudy. 
.tuesday...south winds 5 to 15 knots becoming southwest. snow
showers. 

$$