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open lake forecast for lake ontario
national weather service buffalo ny
402 am est thu dec 25 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 weak surface low will slide from southern quebec to new england 
today, with its trailing cold front crossing the lake this morning. 
following the frontal passage, a strong 30.6 inch high over ontario 
will build across the lake tonight. the high will then drift into 
quebec friday while a compact 29.7 inch low slides across ohio and 
pennsylvania, with the high then building back across the lake 
saturday. complex low pressure averaging 29.6 inches will then cross 
the lower great lakes later sunday and sunday night, before moving 
to the canadian maritimes monday.


loz063-251600-
lake ontario open waters from hamlin beach to sodus bay-
402 am est thu dec 25 2025

.today...west winds 15 to 20 knots becoming north. waves 2 to
4 feet building to 3 to 6 feet. 
.tonight...north winds 15 to 20 knots becoming northeast. waves
3 to 6 feet. 
.friday...east winds 15 to 25 knots. a chance of snow in the
morning, then snow in the afternoon. waves 3 to 6 feet building
to 4 to 7 feet. waves occasionally around 9 feet. 
.friday night...east winds 15 to 25 knots. snow. waves 4 to
7 feet subsiding to 3 to 6 feet. waves occasionally around
9 feet. 
.saturday...east winds 10 to 15 knots. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.sunday...southeast winds 10 to 15 knots becoming south and
increasing to 15 to 25 knots. rain likely during the day, then
rain sunday night. waves 1 to 3 feet building to 3 to 6 feet. 
.monday...west gales to 35 knots increasing to 40 knots. lake
effect rain and snow showers during the day, then lake effect
snow showers monday night. waves 10 to 13 feet building to 15 to
20 feet. waves occasionally around 26 feet. 

$$

fzus61 kbuf 250902
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open lake forecast for lake ontario
national weather service buffalo ny
402 am est thu dec 25 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 weak surface low will slide from southern quebec to new england 
today, with its trailing cold front crossing the lake this morning. 
following the frontal passage, a strong 30.6 inch high over ontario 
will build across the lake tonight. the high will then drift into 
quebec friday while a compact 29.7 inch low slides across ohio and 
pennsylvania, with the high then building back across the lake 
saturday. complex low pressure averaging 29.6 inches will then cross 
the lower great lakes later sunday and sunday night, before moving 
to the canadian maritimes monday.


loz064-065-251600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est thu dec 25 2025

.today...west winds 15 to 25 knots becoming north. waves 2 to
4 feet building to 3 to 6 feet. 
.tonight...north winds 15 to 25 knots becoming northeast and
diminishing to 10 to 15 knots. waves 3 to 6 feet subsiding to
2 to 4 feet. 
.friday...northeast winds 10 to 15 knots becoming east 15 to
20 knots. snow likely in the afternoon. waves 1 to 3 feet
building to 2 to 4 feet. 
.friday night...east winds 15 to 20 knots. snow. waves 2 to
4 feet building to 3 to 5 feet, then subsiding to 2 to 4 feet. 
.saturday...east winds 10 to 15 knots. waves 1 to 3 feet. 
.sunday...southeast winds 10 to 15 knots becoming south and
increasing to 15 to 25 knots. rain likely during the day, then
rain sunday night. waves 1 to 3 feet building to 3 to 6 feet. 
.monday...southwest gales to 35 knots becoming west to 40 knots.
lake effect rain and snow showers during the day, then lake
effect snow showers monday night. waves 9 to 12 feet building to
16 to 21 feet, then subsiding to 15 to 20 feet. waves
occasionally around 27 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est thu dec 25 2025


slz022-251600-
saint lawrence river from cape vincent to ogdensburg-
402 am est thu dec 25 2025

.today...west winds 5 to 15 knots becoming north. cloudy through
early afternoon, then becoming mostly sunny. 
.tonight...north winds 5 to 15 knots becoming northeast. mainly
clear in the evening, then becoming partly cloudy. 
.friday...northeast winds 5 to 10 knots. a chance of snow in the
afternoon. 
.friday night...northeast winds 5 to 10 knots. snow likely. 
.saturday...northeast winds 10 knots or less. partly cloudy. 
.sunday...east winds 10 knots or less increasing to 10 to
15 knots. a chance of freezing rain during the day, then freezing
rain and rain sunday night. 
.monday...southwest winds 15 to 20 knots becoming west. lake
effect snow showers, lake effect rain showers and freezing lake
effect rain during the day, then snow showers likely monday
night. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est thu dec 25 2025


slz024-251600-
saint lawrence river from ogdensburg to saint regis-
402 am est thu dec 25 2025

.today...west winds 5 to 15 knots becoming northwest. a chance of
snow showers early. 
.tonight...northwest winds 10 knots or less becoming north.
mainly clear. 
.friday...north winds 10 knots or less becoming northeast. partly
sunny in the morning, then becoming mostly cloudy. 
.friday night...northeast winds 5 to 10 knots. a chance of snow. 
.saturday...northeast winds 5 to 10 knots becoming light and
variable. partly cloudy. 
.sunday...east winds 10 knots or less becoming northeast 10 to
15 knots. a chance of freezing rain during the day, then freezing
rain sunday night. 
.monday...southeast winds 15 to 25 knots becoming west. lake
effect snow showers and freezing lake effect rain during the day,
then snow showers likely monday night. 

$$