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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est thu dec 4 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 30.4 inch high centered over the corn belt region will 
build into the region tonight. 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 briefly build into the region sunday. a 29.5 inch 
low will approach the region from the south, before moving off the 
mid-atlantic coast sunday night. another 30.4 inch high will quickly 
pass across the region monday night, then 29.9 inches will persist 
across the lake tuesday.


loz064-065-050400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est thu dec 4 2025

.tonight...northwest winds 15 to 25 knots becoming south and
diminishing to 5 to 15 knots. waves 5 to 8 feet subsiding to 1 to
3 feet. waves occasionally around 10 feet. 
.friday...south winds 15 to 25 knots. waves 2 to 4 feet building
to 3 to 5 feet, then subsiding to 2 to 4 feet. 
.friday night...south winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 5 feet. 
.saturday...south winds 15 to 25 knots becoming southwest. snow
showers. waves 3 to 6 feet building to 4 to 7 feet. waves
occasionally around 9 feet. 
.saturday night...west winds 15 to 25 knots becoming north and
diminishing to 10 to 15 knots. snow showers. waves 4 to 7 feet
subsiding to 3 to 6 feet. waves occasionally around 9 feet. 
.sunday...northeast winds 10 to 15 knots becoming north 15 to
20 knots. snow showers likely. waves 2 to 4 feet. 
.monday...north winds 15 to 20 knots becoming south. a chance of
snow showers during the day. waves 2 to 4 feet. 
.tuesday...south winds to 30 knots becoming southwest and
diminishing to 15 to 20 knots. snow showers. waves 3 to 6 feet
building to 5 to 8 feet. waves occasionally around 10 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 dec 4 2025


slz022-050400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est thu dec 4 2025

.tonight...northwest winds 10 to 15 knots becoming south less
than 10 knots. mainly clear. 
.friday...south winds 5 to 15 knots. partly sunny. 
.friday night...south winds 5 to 15 knots. a chance of snow
showers overnight. 
.saturday...south winds 10 to 15 knots becoming southwest. snow
showers likely. 
.saturday night...southwest winds 10 knots or less becoming
north. snow showers likely in the evening. 
.sunday...northeast winds 10 knots or less becoming north. a
chance of snow showers. 
.monday...northwest winds 10 knots or less becoming south. partly
cloudy. 
.tuesday...south winds 5 to 15 knots becoming southwest. snow
showers likely. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est thu dec 4 2025


slz024-050400-
saint lawrence river from ogdensburg to saint regis-
402 pm est thu dec 4 2025

.tonight...northwest winds 10 to 15 knots becoming south less
than 10 knots. mainly clear. 
.friday...south winds 5 to 10 knots. mostly sunny early, then
becoming mostly cloudy. 
.friday night...south winds 5 to 10 knots. a chance of snow
showers overnight. 
.saturday...south winds 5 to 10 knots becoming southwest. snow
showers likely. 
.saturday night...southwest winds 10 knots or less becoming
northwest. a chance of snow showers in the evening. 
.sunday...north winds less than 10 knots. a chance of snow
showers. 
.monday...northwest winds 10 knots or less becoming southwest.
partly cloudy. 
.tuesday...south winds 5 to 10 knots becoming southwest. snow
showers likely. 

$$