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open lake forecast for lake ontario
national weather service buffalo ny
402 am est sat dec 13 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 29.6 inch low will move from just south of james 
bay this morning to southern quebec tonight while weakening to 29.9 
inches, all while dragging an attendant cold front across the lake 
today. a strong 30.8 inch high over the mid mississippi valley 
sunday will then settle across the southeast states monday and 
tuesday while weakening to 30.3 inches. meanwhile, a strong 29.1 
inch low over the southern canadian prairies tuesday will strengthen 
to 28.7 inches while quickly shifting east across northwestern 
ontario and into central quebec by wednesday...while pushing an 
attendant warm front across the lake tuesday, followed by a cold 
front on wednesday.


loz063-131600-
lake ontario open waters from hamlin beach to sodus bay-
402 am est sat dec 13 2025

.today...southwest winds to 30 knots becoming west. snow showers
likely this morning, then a chance of snow showers this
afternoon. waves 3 to 5 feet building to 9 to 13 feet. waves
occasionally around 16 feet. 
.tonight...west winds to 30 knots diminishing to 15 to 20 knots.
lake effect snow showers. waves 9 to 12 feet subsiding to 4 to
7 feet. waves occasionally around 15 feet. 
.sunday...west winds 15 to 20 knots becoming northwest. lake
effect snow in the morning, then lake effect snow showers likely
in the afternoon. waves 4 to 7 feet. waves occasionally around
9 feet. 
.sunday night...northwest winds 15 to 20 knots. a chance of snow
showers. waves 3 to 6 feet. 
.monday...west winds 15 to 20 knots increasing to 30 knots. lake
effect snow. waves 2 to 4 feet building to 6 to 10 feet. waves
occasionally around 13 feet. 
.tuesday...west winds 15 to 25 knots becoming southwest. waves
4 to 7 feet. waves occasionally around 9 feet. 
.wednesday...southwest winds to 30 knots becoming south and
diminishing to 15 to 20 knots. waves 6 to 10 feet subsiding to
2 to 4 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 13 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 29.6 inch low will move from just south of james 
bay this morning to southern quebec tonight while weakening to 29.9 
inches, all while dragging an attendant cold front across the lake 
today. a strong 30.8 inch high over the mid mississippi valley 
sunday will then settle across the southeast states monday and 
tuesday while weakening to 30.3 inches. meanwhile, a strong 29.1 
inch low over the southern canadian prairies tuesday will strengthen 
to 28.7 inches while quickly shifting east across northwestern 
ontario and into central quebec by wednesday...while pushing an 
attendant warm front across the lake tuesday, followed by a cold 
front on wednesday.


loz064-065-131600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est sat dec 13 2025

.today...south winds to 30 knots becoming west. lake effect snow
showers through early afternoon, then a chance of snow showers
late. waves 3 to 6 feet building to 9 to 13 feet. waves
occasionally around 16 feet. 
.tonight...west winds to 30 knots diminishing to 15 to 20 knots.
lake effect snow showers. waves 9 to 12 feet subsiding to 5 to
8 feet. waves occasionally around 15 feet. 
.sunday...northwest winds 15 to 20 knots. lake effect snow in the
morning, then a chance of snow showers in the afternoon. waves
4 to 7 feet subsiding to 3 to 6 feet. waves occasionally around
9 feet. 
.sunday night...northwest winds 15 to 20 knots. a chance of snow
showers. waves 3 to 6 feet. 
.monday...southwest winds to 30 knots becoming west 15 to
25 knots. lake effect snow. waves 2 to 4 feet building to 6 to
10 feet. waves occasionally around 13 feet. 
.tuesday...west winds 15 to 25 knots becoming south to 30 knots.
a chance of snow showers during the day. waves 4 to 7 feet. waves
occasionally around 9 feet. 
.wednesday...southwest winds to 30 knots becoming south and
diminishing to 15 to 20 knots. a chance of rain showers during
the day. waves 6 to 10 feet subsiding to 3 to 5 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 13 2025


slz022-131600-
saint lawrence river from cape vincent to ogdensburg-
402 am est sat dec 13 2025

.today...south winds 15 to 20 knots becoming southwest. a chance
of snow showers early, then lake effect snow showers. a chance of
snow showers late. 
.tonight...southwest winds 15 to 20 knots becoming west 5 to
15 knots. mostly cloudy. 
.sunday...northwest winds 10 knots or less. partly to mostly
sunny. 
.sunday night...northwest winds 10 knots or less becoming west.
partly to mostly cloudy. 
.monday...west winds 10 knots or less becoming southwest. lake
effect snow. 
.tuesday...southwest winds 10 knots or less becoming south and
increasing to 15 to 20 knots. mostly cloudy. 
.wednesday...southwest winds 15 to 20 knots becoming south 5 to
15 knots. a chance of rain showers during the day. 

$$

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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 13 2025


slz024-131600-
saint lawrence river from ogdensburg to saint regis-
402 am est sat dec 13 2025

.today...south winds 5 to 15 knots becoming southwest. a chance
of snow showers. 
.tonight...southwest winds 10 knots or less. mostly cloudy. 
.sunday...northwest winds 10 knots or less becoming west. partly
to mostly sunny. 
.sunday night...west winds 5 to 10 knots. mostly cloudy. 
.monday...southwest winds 5 to 10 knots. a chance of snow
showers. 
.tuesday...southwest winds 5 to 15 knots becoming south 15 to
20 knots. mostly cloudy. 
.wednesday...southwest winds 15 to 20 knots becoming south 5 to
15 knots. a chance of rain and snow showers during the day. 

$$