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open lake forecast for lake ontario
national weather service buffalo ny
402 am est mon nov 17 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 28.9 low over maine will make its way across the 
canadian maritimes through monday, before withdrawing northward 
across labrador on tuesday. a 30.3 inch high will then build from 
the upper great lakes tuesday to the lower great lakes wednesday, 
then to new england thursday. a 29.6 inch low over central ontario 
will then make its way to quebec friday, while pushing its trailing 
cold front across the lake.


loz064-065-171600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est mon nov 17 2025

.today...northwest winds to 30 knots. waves 7 to 10 feet. waves
occasionally around 13 feet. 
.tonight...northwest winds 15 to 25 knots. waves 6 to 10 feet
subsiding to 5 to 8 feet. waves occasionally around 13 feet. 
.tuesday...northwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.tuesday night...west winds 5 to 10 knots becoming northwest.
waves 1 to 3 feet subsiding to 1 foot or less. 
.wednesday...northwest winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.thursday...southeast winds 5 to 15 knots becoming south 15 to
20 knots. rain showers likely thursday night. waves 1 to 3 feet. 
.friday...south winds 15 to 25 knots becoming northwest. rain
showers. waves 3 to 6 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est mon nov 17 2025


slz022-171600-
saint lawrence river from cape vincent to ogdensburg-
402 am est mon nov 17 2025

.today...northwest winds 10 to 15 knots becoming west. a chance
of snow showers early. 
.tonight...west winds 5 to 15 knots. mostly cloudy. 
.tuesday...west winds 10 knots or less becoming southwest. mostly
sunny. 
.tuesday night...southwest winds less than 10 knots. partly
cloudy. 
.wednesday...light and variable winds. mainly clear, then
becoming mostly cloudy. 
.thursday...light and variable winds becoming south 5 to
10 knots. rain showers likely thursday night. 
.friday...south winds 5 to 10 knots becoming northwest. rain
showers. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est mon nov 17 2025


slz024-171600-
saint lawrence river from ogdensburg to saint regis-
402 am est mon nov 17 2025

.today...west winds 10 to 15 knots increasing to 15 to 20 knots.
a chance of snow showers this morning. 
.tonight...west winds 10 to 15 knots. mostly cloudy. 
.tuesday...west winds 5 to 10 knots. partly sunny. 
.tuesday night...west winds less than 10 knots. partly cloudy. 
.wednesday...light and variable winds. partly to mostly cloudy. 
.thursday...light and variable winds. rain showers likely
thursday night. 
.friday...south winds 5 to 10 knots becoming west. rain showers. 

$$