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open lake forecast for lake ontario
national weather service buffalo ny
402 am est mon dec 22 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.


loz064-065-221600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est mon dec 22 2025

.today...northwest winds 10 to 15 knots becoming southwest 15 to
20 knots. a chance of snow showers this morning. waves 2 to
4 feet building to 3 to 5 feet. 
.tonight...west winds 15 to 20 knots becoming south 10 to
15 knots. a chance of snow early, then snow from late evening on.
waves 3 to 5 feet subsiding to 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming southwest. rain
and snow in the morning, then rain likely in the afternoon. waves
1 to 3 feet building to 3 to 5 feet. 
.tuesday night...west winds 15 to 25 knots becoming northwest to
30 knots. rain showers likely in the evening, then a chance of
rain and snow showers overnight. waves 5 to 8 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 east 15 to
20 knots. a chance of rain and snow showers thursday night. waves
1 to 3 feet. 
.friday...east winds 15 to 25 knots becoming north. rain and snow
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 dec 22 2025


slz022-221600-
saint lawrence river from cape vincent to ogdensburg-
402 am est mon dec 22 2025

.today...light and variable winds. a chance of snow showers. 
.tonight...southwest winds less than 10 knots becoming south. a
chance of snow through the early overnight, then snow likely
late. 
.tuesday...southeast winds 10 knots or less. snow in the morning,
then snow with rain showers likely in the afternoon. 
.tuesday night...southwest winds 5 to 15 knots becoming
northwest. snow showers with rain showers likely in the evening,
then snow showers likely overnight. 
.wednesday...northwest winds 10 to 15 knots becoming south less
than 10 knots. mostly cloudy. 
.thursday...west winds 10 knots or less becoming northeast. a
chance of snow showers thursday night. 
.friday...northeast winds 5 to 10 knots becoming north. snow
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 dec 22 2025


slz024-221600-
saint lawrence river from ogdensburg to saint regis-
402 am est mon dec 22 2025

.today...southwest winds 10 knots or less. a chance of snow
showers. 
.tonight...south winds less than 10 knots. a chance of snow
showers early, then a chance of snow from late evening on. 
.tuesday...east winds 10 knots or less. snow.
.tuesday night...east winds 5 to 15 knots becoming northwest.
snow showers. 
.wednesday...northwest winds 5 to 15 knots becoming southwest
less than 10 knots. mostly cloudy. 
.thursday...west winds 10 knots or less becoming northeast. a
chance of snow showers thursday night. 
.friday...northeast winds 5 to 15 knots becoming north. snow
showers. 

$$