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open lake forecast for lake ontario
national weather service buffalo ny
402 am est fri dec 26 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.


loz064-065-261600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est fri dec 26 2025

.today...east winds 10 to 15 knots increasing to 15 to 20 knots.
snow showers likely early this afternoon. snow showers late.
waves 1 to 3 feet building to 2 to 4 feet. 
.tonight...east winds 15 to 20 knots. snow showers early, then a
chance of snow showers late in the evening. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.saturday...east winds 5 to 15 knots becoming northeast. waves
1 to 3 feet. 
.saturday night...northeast winds 5 to 10 knots becoming
southeast. waves 2 feet or less. 
.sunday...southeast winds 10 to 15 knots increasing to 15 to
20 knots. rain. waves 1 to 3 feet building to 2 to 4 feet. 
.monday...south winds to 30 knots becoming northwest and
increasing to 40 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. 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 am est fri dec 26 2025


slz022-261600-
saint lawrence river from cape vincent to ogdensburg-
402 am est fri dec 26 2025

.today...northeast winds 10 knots or less. snow showers likely
late. 
.tonight...northeast winds 5 to 10 knots. snow showers in the
evening, then a chance of snow showers after midnight. 
.saturday...northeast winds 10 knots or less. mostly sunny. 
.saturday night...northeast winds less than 10 knots. mainly
clear in the evening, then becoming mostly cloudy. 
.sunday...east winds 10 knots or less becoming northeast. a
chance of freezing rain during the day, then freezing rain and
rain sunday night. 
.monday...southeast winds 10 to 15 knots becoming west 15 to
20 knots. lake effect rain, freezing lake effect rain and snow
showers during the day, then snow showers monday night. 
.tuesday...west winds 15 to 20 knots diminishing to 5 to
15 knots. snow showers likely. 

$$

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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 26 2025


slz024-261600-
saint lawrence river from ogdensburg to saint regis-
402 am est fri dec 26 2025

.today...north winds 10 knots or less becoming northeast. a
chance of snow showers late. 
.tonight...northeast winds 5 to 15 knots. snow showers in the
evening, then a chance of snow showers after midnight. 
.saturday...northeast winds 10 knots or less. sunny.
.saturday night...light and variable winds. mainly clear in the
evening, then becoming partly cloudy. 
.sunday...east winds 10 knots or less becoming northeast.
freezing rain sunday night. 
.monday...east winds 10 to 15 knots becoming west and increasing
to 15 to 25 knots. freezing lake effect rain and snow showers
during the day, then snow showers monday night. 
.tuesday...west winds 15 to 20 knots diminishing to 5 to
10 knots. snow showers likely during the day, then a chance of
snow showers tuesday night. 

$$