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open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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 29.3 inch low will develop tonight just south of nova 
scotia, then move north across the canadian maritimes friday 
morning. a 30.1 inch high will then briefly ridge south across the 
lake friday afternoon and friday night as it slides east across 
southern quebec. a 29.2 inch low will track across the lake saturday 
afternoon and saturday night then to new england through the day on 
sunday. a trough averaging 29.6 inches then lingers over lake erie 
through monday.


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

.tonight...northwest winds 15 to 25 knots. a chance of rain
showers. waves 5 to 8 feet subsiding to 3 to 6 feet. waves
occasionally around 10 feet. 
.friday...northwest winds 15 to 20 knots. a chance of rain
showers. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.friday night...north winds 5 to 15 knots becoming east. waves
1 to 3 feet subsiding to 1 foot or less. 
.saturday...southeast winds 5 to 15 knots increasing to 15 to
20 knots. rain showers likely in the afternoon. waves 1 to
3 feet. 
.saturday night...south winds 15 to 20 knots becoming west and
increasing to 30 knots. showers. waves 2 to 4 feet building to
7 to 10 feet. waves occasionally around 13 feet. 
.sunday...west winds to 30 knots becoming northwest. rain and
snow showers. waves 10 to 13 feet subsiding to 8 to 11 feet.
waves occasionally around 16 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 showers monday night. waves 6 to 10 feet subsiding
to 3 to 6 feet. waves occasionally around 13 feet. 
.tuesday...northwest winds 10 to 15 knots. a chance of rain
showers. waves 3 to 5 feet subsiding to 1 to 3 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 nov 13 2025


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

.tonight...west winds 5 to 10 knots becoming northwest. partly to
mostly cloudy. 
.friday...northwest winds 5 to 10 knots. partly sunny. 
.friday night...northwest winds 5 to 10 knots becoming light and
variable. partly cloudy. 
.saturday...light and variable winds becoming southeast 5 to
10 knots. rain showers likely with a chance of snow showers in
the afternoon. 
.saturday night...southeast winds 5 to 10 knots becoming west.
rain showers. 
.sunday...west winds 5 to 15 knots. rain showers with snow
showers likely during the day, then snow showers likely sunday
night. 
.monday...west winds 5 to 10 knots. a chance of rain and snow
showers during the day. 
.tuesday...west winds 10 knots or less. mostly cloudy. 

$$

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


slz024-140400-
saint lawrence river from ogdensburg to saint regis-
402 pm est thu nov 13 2025

.tonight...west winds 10 knots or less. mostly cloudy. 
.friday...west winds 10 knots or less becoming northwest. a
chance of snow showers early. 
.friday night...northwest winds 5 to 10 knots becoming light and
variable. partly cloudy. 
.saturday...light and variable winds. a chance of rain and snow
showers in the afternoon. 
.saturday night...light and variable winds becoming west 5 to
10 knots. rain showers with a chance of snow showers in the
evening, then rain and snow showers overnight. 
.sunday...west winds 5 to 15 knots. snow and rain 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. 
.tuesday...west winds 10 knots or less. mostly cloudy. 

$$