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open lake forecast for lake ontario
national weather service buffalo ny
1002 am est sun dec 7 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 weak 29.9 inch surface low will slowly cross the lake 
through the afternoon hours. another 30.4 inch high will move across 
the region monday through monday night, before moving off the east 
coast tuesday. a 29.5 inch low will move across the upper great 
lakes tuesday, then a stronger low averaging 29.3 inches will 
approach the region tuesday night and potentially move northwest of 
the lake wednesday. a 29.9 inch high is expected to move into the 
great lakes region thursday.


loz064-065-072200-
lake ontario open waters from sodus bay to the saint lawrence
river-
1002 am est sun dec 7 2025

.this afternoon...southeast winds 5 to 15 knots becoming
northwest. snow. waves 1 to 3 feet. 
.tonight...northwest winds 15 to 20 knots becoming north. snow
likely early, then a chance of snow showers late in the evening.
waves 3 to 6 feet. 
.monday...north winds 15 to 20 knots becoming northwest 5 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.monday night...west winds 5 to 15 knots becoming south 15 to
20 knots. waves 1 to 3 feet. 
.tuesday...south gales to 35 knots becoming southwest. snow
showers likely during the day, then rain and snow showers tuesday
night. waves 4 to 7 feet building to 7 to 10 feet, then subsiding
to 5 to 8 feet. waves occasionally around 13 feet. 
.wednesday...south winds to 30 knots becoming northwest. rain and
snow showers. waves 5 to 8 feet building to 6 to 9 feet. waves
occasionally around 11 feet. 
.thursday...northwest winds 15 to 25 knots. snow showers likely
during the day, then a chance of snow showers thursday night.
waves 5 to 8 feet subsiding to 3 to 6 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
1002 am est sun dec 7 2025


slz022-072200-
saint lawrence river from cape vincent to ogdensburg-
1002 am est sun dec 7 2025

.rest of today...northeast winds 10 knots or less. snow.
.tonight...north winds 10 knots or less becoming northwest. snow
likely early, then a chance of snow showers late in the evening. 
.monday...northwest winds less than 10 knots becoming southwest.
sunny.
.monday night...southwest winds 10 knots or less becoming south.
partly to mostly cloudy. 
.tuesday...south winds 10 to 15 knots becoming southwest. snow
showers likely during the day, then snow and rain showers tuesday
night. 
.wednesday...south winds 10 to 15 knots becoming northwest 5 to
10 knots. rain and snow showers. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of snow showers. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am est sun dec 7 2025


slz024-072200-
saint lawrence river from ogdensburg to saint regis-
1002 am est sun dec 7 2025

.rest of today...light and variable winds. a chance of snow late
this morning, then snow this afternoon. 
.tonight...northeast winds 10 knots or less becoming northwest.
snow likely early, then a chance of snow showers late in the
evening. 
.monday...northwest winds 10 knots or less becoming southwest.
sunny.
.monday night...southwest winds less than 10 knots becoming
south. partly to mostly cloudy. 
.tuesday...south winds 5 to 15 knots. snow showers. 
.wednesday...south winds 10 to 15 knots becoming west 5 to
10 knots. snow and rain showers. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of snow showers. 

$$