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open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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 30.6 inch high will build east across ontario and 
quebec tonight, with a ridge extending southward across the lake. a 
compact 29.7 inch low will then move across ohio and pennsylvania 
friday afternoon through friday night before moving off the mid 
atlantic coast by saturday. a ridge of high pressure averaging 30.2 
inches will then build into quebec and new england saturday through 
saturday night. complex low pressure averaging 29.6 inches will then 
cross the lower great lakes sunday night, before moving to northern 
new england and southern quebec monday, then to the canadian 
maritimes by tuesday while deepening to 28.9 inches.


loz064-065-260400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est thu dec 25 2025

.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. a chance of snow showers late in the morning. snow in
the afternoon. waves 1 to 3 feet building to 2 to 4 feet. 
.friday night...east winds 15 to 20 knots. snow. waves 3 to
5 feet subsiding to 2 to 4 feet. 
.saturday...northeast winds 5 to 15 knots. a chance of snow
showers in the morning. waves 1 to 3 feet. 
.saturday night...northeast winds 5 to 10 knots becoming east.
waves 2 feet or less. 
.sunday...southeast winds 10 to 15 knots increasing to 15 to
20 knots. a chance of rain during the day, then rain sunday
night. waves 1 to 3 feet building to 2 to 4 feet. 
.monday...southwest winds to 30 knots becoming northwest and
increasing to 45 knot gales. rain with snow showers likely during
the day, then lake effect snow showers monday night. waves 7 to
10 feet building to 16 to 21 feet. waves occasionally around
27 feet. 
.tuesday...northwest gales to 40 knots becoming west and
diminishing to 30 knots. lake effect snow showers likely. waves
14 to 18 feet subsiding to 9 to 12 feet. waves occasionally
around 23 feet. 

$$

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


slz022-260400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est thu dec 25 2025

.tonight...north winds 5 to 15 knots. partly cloudy. 
.friday...northeast winds 10 knots or less. a chance of snow
showers late. 
.friday night...northeast winds 5 to 15 knots. snow.
.saturday...northeast winds 10 knots or less. a chance of snow
showers in the morning. 
.saturday night...northeast winds less than 10 knots. partly to
mostly cloudy. 
.sunday...east winds 10 knots or less. a chance of freezing rain
during the day, then freezing rain and rain sunday night. 
.monday...south winds 10 to 15 knots becoming west 15 to
20 knots. lake effect rain and freezing lake effect rain with
lake effect snow showers likely during the day, then lake effect
snow showers likely monday night. 
.tuesday...west winds 5 to 15 knots becoming southwest. snow
showers likely during the day, then a chance of snow showers
tuesday night. 

$$

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


slz024-260400-
saint lawrence river from ogdensburg to saint regis-
402 pm est thu dec 25 2025

.tonight...northwest winds 10 knots or less becoming north.
becoming mainly clear. 
.friday...light and variable winds becoming northeast around
10 knots. mostly sunny early, then becoming cloudy. 
.friday night...northeast winds 5 to 10 knots. snow likely. 
.saturday...northeast winds 10 knots or less. a chance of snow
showers in the morning. 
.saturday night...northeast winds less than 10 knots. mainly
clear in the evening, then becoming partly cloudy. 
.sunday...light and variable winds becoming northeast 5 to
10 knots. freezing rain sunday night. 
.monday...southeast winds 10 to 15 knots becoming west 15 to
20 knots. lake effect rain and freezing lake effect rain with
lake effect snow showers likely during the day, then lake effect
snow showers likely monday night. 
.tuesday...west winds 15 to 20 knots becoming southwest 5 to
15 knots. snow showers likely during the day, then a chance of
snow showers tuesday night. 

$$