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open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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 advance towards southern quebec 
tonight while weakening to 29.9 inches. 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.


loz064-065-140400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est sat dec 13 2025

.tonight...west winds 15 to 25 knots. lake effect snow with some
rumbles of thunder possible. waves 9 to 12 feet subsiding to 5 to
8 feet. waves occasionally around 15 feet. 
.sunday...northwest winds 20 to 25 knots. lake effect snow with
some rumbles of thunder possible in the morning, then a chance of
snow showers in the afternoon. waves 5 to 9 feet. waves
occasionally around 11 feet. 
.sunday night...northwest winds 15 to 25 knots. a chance of snow
showers. waves 4 to 7 feet subsiding to 3 to 6 feet. waves
occasionally around 9 feet. 
.monday...northwest winds 15 to 25 knots becoming southwest to
30 knots. lake effect snow showers. waves 2 to 4 feet building to
6 to 9 feet. waves occasionally around 11 feet. 
.monday night...southwest winds to 30 knots becoming west 15 to
25 knots. lake effect snow showers. waves 6 to 10 feet subsiding
to 5 to 8 feet. waves occasionally around 13 feet. 
.tuesday...west winds 15 to 20 knots becoming south and
increasing to 30 knots. lake effect snow showers during the day.
waves 4 to 7 feet. waves occasionally around 9 feet. 
.wednesday...southwest winds to 30 knots diminishing to 15 to
20 knots. a chance of rain showers during the day. waves 6 to
10 feet subsiding to 2 to 4 feet. waves occasionally around
13 feet. 
.thursday...southeast winds to 30 knots becoming southwest and
increasing to 40 knot gales. rain showers likely during the day,
then rain showers with snow showers likely thursday night. waves
4 to 7 feet building to 12 to 16 feet. waves occasionally around
20 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est sat dec 13 2025


slz022-140400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est sat dec 13 2025

.tonight...west winds 5 to 15 knots diminishing to less than
10 knots. mostly cloudy. 
.sunday...northwest winds 10 knots or less. partly sunny in the
morning, then becoming mostly sunny. 
.sunday night...northwest winds 5 to 10 knots becoming west.
mostly cloudy. 
.monday...west winds 10 knots or less becoming southwest 10 to
15 knots. snow showers in the afternoon. 
.monday night...southwest winds 5 to 15 knots. lake effect snow
showers. 
.tuesday...southwest winds 5 to 15 knots becoming south 15 to
20 knots. a chance of snow showers. 
.wednesday...southwest winds 15 to 20 knots becoming south 5 to
15 knots. a chance of rain and snow showers during the day. 
.thursday...south winds 15 to 25 knots becoming southwest. rain
showers likely during the day, then rain showers thursday night. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est sat dec 13 2025


slz024-140400-
saint lawrence river from ogdensburg to saint regis-
402 pm est sat dec 13 2025

.tonight...southwest winds 5 to 15 knots becoming west less than
10 knots. mostly cloudy. 
.sunday...northwest winds 10 knots or less. partly sunny early,
then becoming mostly sunny. 
.sunday night...northwest winds 5 to 10 knots becoming west.
mostly cloudy. 
.monday...west winds 5 to 10 knots becoming southwest. a chance
of snow showers in the afternoon. 
.monday night...southwest winds 5 to 10 knots. a chance of snow
showers. 
.tuesday...southwest winds 5 to 15 knots increasing to 15 to
25 knots. a chance of snow showers tuesday night. 
.wednesday...southwest winds 15 to 25 knots diminishing to 5 to
10 knots. a chance of rain and snow showers during the day. 
.thursday...southeast winds 10 to 15 knots becoming southwest and
increasing to 15 to 25 knots. rain showers. 

$$