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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est wed dec 3 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 30.2 inch surface high will build across the ohio 
valley and lower great lakes through thursday morning before pushing 
off the coast. a large 29.2 inch surface low near hudson bay will 
push its cold front across the lake tonight, with another 30.4 inch 
high building in its wake thursday night. the high will then quickly 
move east of the lake friday. another cold front will cross the lake 
late saturday and saturday night, this from a 29.3 inch low near 
northern james bay. then, another area of surface high pressure 
averaging 30.3 inches will build eastward across the great lakes 
through sunday, moving overhead monday.


loz064-065-040400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est wed dec 3 2025

.tonight...southwest winds to 30 knots becoming northwest. a
chance of snow and rain showers early, then lake effect snow and
lake effect rain. lake effect snow showers late. waves 5 to
9 feet building to 7 to 10 feet. waves occasionally around
13 feet. 
.thursday...northwest winds to 30 knots. lake effect snow showers
likely in the morning, then a chance of snow showers early in the
afternoon. waves 6 to 9 feet building to 7 to 11 feet. waves
occasionally around 14 feet. 
.thursday night...northwest winds to 30 knots becoming southeast
and diminishing to 5 to 15 knots overnight. a chance of snow
showers overnight. waves 6 to 9 feet subsiding to 2 feet or less.
waves occasionally around 11 feet. 
.friday...south winds 15 to 25 knots. a chance of snow showers in
the morning. waves 1 to 3 feet building to 3 to 5 feet. 
.friday night...south winds 15 to 20 knots. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.saturday...south winds 15 to 20 knots becoming west. snow
showers likely. waves 2 to 4 feet building to 3 to 6 feet. 
.sunday...northwest winds 10 to 15 knots becoming north 15 to
20 knots. snow showers likely during the day, then a chance of
snow showers sunday night. waves 2 to 4 feet subsiding to 1 to
3 feet. 
.monday...north winds 10 to 15 knots becoming south 15 to
20 knots. a chance of snow showers. waves 1 to 3 feet building to
2 to 4 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est wed dec 3 2025


slz022-040400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est wed dec 3 2025

.tonight...southwest winds 15 to 20 knots becoming west 10 to
15 knots. lake effect snow this evening, then lake effect snow
showers likely after midnight. a chance of snow showers late. 
.thursday...northwest winds 5 to 15 knots becoming west 15 to
20 knots. a chance of snow showers in the morning. 
.thursday night...northwest winds 10 to 15 knots becoming south
less than 10 knots. mainly clear. 
.friday...south winds 5 to 15 knots. partly sunny in the morning,
then becoming mostly cloudy. 
.friday night...south winds 5 to 10 knots. a chance of snow
showers overnight. 
.saturday...south winds 10 knots or less becoming west. snow
showers likely. 
.sunday...north winds 10 knots or less becoming northwest. a
chance of snow showers. 
.monday...north winds 10 knots or less becoming south. partly
cloudy. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est wed dec 3 2025


slz024-040400-
saint lawrence river from ogdensburg to saint regis-
402 pm est wed dec 3 2025

.tonight...southwest winds 10 to 15 knots becoming west. lake
effect snow showers likely through the early overnight, then a
chance of snow showers late. 
.thursday...northwest winds 10 to 15 knots increasing to 15 to
20 knots. a chance of snow showers early. 
.thursday night...northwest winds 5 to 15 knots becoming south
less than 10 knots. mainly clear. 
.friday...south winds 5 to 10 knots. partly sunny. 
.friday night...south winds 10 knots or less. a chance of snow
showers overnight. 
.saturday...south winds 5 to 10 knots becoming west. snow showers
likely during the day, then a chance of snow showers saturday
night. 
.sunday...northwest winds less than 10 knots. a chance of snow
showers. 
.monday...west winds less than 10 knots becoming southwest.
partly cloudy. 

$$