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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est sun dec 21 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 large 30.6 inch high will build east across the lake 
tonight, then slide to the atlantic coastline monday. a 29.8 inch 
low just north of lake superior tuesday will pass north of the lake, 
resulting in a pair of fronts passing across the region. following 
the passage of this system, a 30.4 inch high will then build across 
the lake wednesday, sliding off the atlantic coastline thursday.


loz064-065-220400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est sun dec 21 2025

...gale warning in effect until 10 pm est this evening...

.tonight...northwest winds to 30 knots diminishing to 10 to
15 knots. a chance of snow showers early. a chance of snow
showers after midnight, then lake effect snow likely late. waves
12 to 16 feet subsiding to 3 to 6 feet. waves occasionally around
20 feet. 
.monday...northwest winds 10 to 15 knots becoming southwest 15 to
20 knots. lake effect snow likely early, then a chance of snow
showers late in the morning. waves 2 to 4 feet building to 3 to
5 feet. 
.monday night...southwest winds 10 to 15 knots becoming south. a
chance of rain and snow in the evening, then snow and rain likely
overnight. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.tuesday...southeast winds 10 to 15 knots becoming southwest and
increasing to 15 to 25 knots. rain and snow. waves 1 to 3 feet
building to 3 to 6 feet. 
.tuesday night...west winds to 30 knots becoming northwest. rain
likely in the evening, then a chance of snow and rain overnight.
waves 6 to 9 feet building to 8 to 12 feet. waves occasionally
around 15 feet. 
.wednesday...northwest winds 15 to 25 knots becoming south and
diminishing to 5 to 15 knots. waves 7 to 10 feet subsiding to
2 feet or less. waves occasionally around 13 feet. 
.thursday...south winds 10 to 15 knots becoming southeast. a
chance of rain showers thursday night. waves 1 to 3 feet. 
.friday...northeast winds 15 to 20 knots. rain and snow showers
likely. waves 2 to 4 feet building to 3 to 5 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est sun dec 21 2025


slz022-220400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est sun dec 21 2025

.tonight...northwest winds 5 to 15 knots becoming west less than
10 knots. mostly cloudy. 
.monday...light and variable winds. mostly cloudy. 
.monday night...southwest winds less than 10 knots becoming
south. a chance of snow. 
.tuesday...southeast winds 10 knots or less becoming south. snow
in the morning, then snow and rain in the afternoon. 
.tuesday night...southwest winds 5 to 15 knots becoming
northwest. snow and rain in the evening, then snow likely
overnight. 
.wednesday...northwest winds 10 knots or less becoming south.
mostly cloudy. 
.thursday...east winds 10 knots or less becoming northeast. a
chance of rain and snow showers thursday night. 
.friday...north winds 5 to 10 knots becoming northeast. snow and
rain showers likely during the day, then snow showers likely
friday night. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est sun dec 21 2025


slz024-220400-
saint lawrence river from ogdensburg to saint regis-
402 pm est sun dec 21 2025

.tonight...west winds 5 to 15 knots. mostly cloudy. 
.monday...southwest winds 10 knots or less. partly sunny in the
morning, then becoming mostly cloudy. 
.monday night...light and variable winds. a chance of snow
overnight. 
.tuesday...east winds 10 knots or less. snow.
.tuesday night...southeast winds 5 to 15 knots becoming
northwest. snow.
.wednesday...northwest winds 10 to 15 knots becoming south less
than 10 knots. mostly cloudy. 
.thursday...northeast winds 10 knots or less. a chance of snow
showers thursday night. 
.friday...northeast winds 5 to 10 knots. snow showers likely. 

$$