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open lake forecast for lake ontario
national weather service buffalo ny
402 am est thu nov 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 29.5 inch low crosses the great lakes early this 
morning. another 29.2 inch low will develop south of nova scotia 
today, then move north across the canadian maritimes friday, 
remaining in place through saturday. meanwhile, a 30.1 inch high 
will build from northwest ontario province friday to james bay and 
the lower great lakes by saturday. a 29.2 inch low will track across 
the lake and to new england through the day on sunday.


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

.today...west winds to 30 knots becoming northwest. lake effect
showers with a few rumbles of thunder possible this morning, then
a chance of showers this afternoon. waves 6 to 9 feet. waves
occasionally around 11 feet. 
.tonight...northwest winds 15 to 25 knots diminishing to 10 to
15 knots. a chance of showers early, then showers likely late in
the evening. a chance of showers after midnight. waves 4 to
7 feet subsiding to 3 to 6 feet. waves occasionally around
9 feet. 
.friday...northwest winds 10 to 15 knots. a chance of rain
showers. waves 2 to 4 feet. 
.friday night...northwest winds 5 to 10 knots becoming northeast.
a chance of rain showers in the evening. waves 1 to 2 feet. 
.saturday...southeast winds 5 to 15 knots becoming west and
increasing to 30 knots. rain showers likely during the day, then
rain saturday night. waves 1 to 2 feet building to 3 to 5 feet. 
.sunday...west winds to 30 knots becoming northwest. rain showers
likely during the day, then rain showers with snow showers likely
sunday night. waves 6 to 9 feet building to 7 to 11 feet, then
subsiding to 6 to 9 feet. waves occasionally around 14 feet. 
.monday...northwest winds to 30 knots diminishing to 15 to
20 knots. rain and snow showers likely during the day, then a
chance of rain and snow showers monday night. waves 6 to 10 feet
subsiding to 3 to 5 feet. waves occasionally around 13 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am est thu nov 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 29.5 inch low crosses the great lakes early this 
morning. another 29.2 inch low will develop south of nova scotia 
today, then move north across the canadian maritimes friday, 
remaining in place through saturday. meanwhile, a 30.1 inch high 
will build from northwest ontario province friday to james bay and 
the lower great lakes by saturday. a 29.2 inch low will track across 
the lake and to new england through the day on sunday.


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

.today...northwest winds 15 to 25 knots. lake effect rain showers
this morning, then a chance of rain showers this afternoon. waves
5 to 9 feet. waves occasionally around 11 feet. 
.tonight...northwest winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of rain showers. waves 4 to 7 feet subsiding
to 3 to 6 feet. waves occasionally around 9 feet. 
.friday...northwest winds 10 to 15 knots. a chance of rain
showers. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday night...north winds 5 to 10 knots becoming east. a chance
of rain showers in the evening. waves 1 to 3 feet subsiding to
1 foot or less. 
.saturday...southeast winds 5 to 10 knots becoming west and
increasing to 30 knots. rain showers likely during the day, then
rain saturday night. waves 1 to 3 feet building to 3 to 5 feet. 
.sunday...west winds to 30 knots becoming northwest. rain showers
during the day, then rain and snow showers sunday night. waves
6 to 9 feet building to 7 to 11 feet, then subsiding to 6 to
9 feet. waves occasionally around 14 feet. 
.monday...northwest winds to 30 knots diminishing to 15 to
25 knots. rain and snow showers likely during the day, then a
chance of rain and snow showers monday night. waves 6 to 10 feet
subsiding to 3 to 6 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 thu nov 13 2025


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

.today...west winds 5 to 10 knots. a chance of rain showers
early, then a chance of rain and snow showers late this morning.
a chance of rain showers early this afternoon. 
.tonight...northwest winds 10 knots or less. partly to mostly
cloudy. 
.friday...northwest winds 10 knots or less. partly sunny. 
.friday night...northwest winds less than 10 knots. partly
cloudy. 
.saturday...south winds 10 knots or less becoming southwest. a
chance of rain showers during the day, then rain saturday night. 
.sunday...west winds 5 to 15 knots. rain and snow showers likely
during the day, then snow showers likely sunday night. 
.monday...west winds 5 to 15 knots. a chance of rain and snow
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 thu nov 13 2025


slz024-131600-
saint lawrence river from ogdensburg to saint regis-
402 am est thu nov 13 2025

.today...west winds 10 knots or less. a chance of snow showers
this morning, then a chance of rain and snow showers early this
afternoon. 
.tonight...west winds less than 10 knots. mostly cloudy. 
.friday...west winds 10 knots or less becoming northwest. partly
sunny. 
.friday night...light and variable winds. partly cloudy. 
.saturday...southwest winds 10 knots or less becoming south. a
chance of rain showers during the day, then rain saturday night. 
.sunday...west winds 5 to 15 knots. rain and snow showers during
the day, then snow showers likely sunday night. 
.monday...west winds 5 to 15 knots. a chance of snow showers
during the day. 

$$