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open lake forecast for lake ontario
national weather service buffalo ny
402 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 30.0 inch surface low forming over the western 
lake erie waters this morning will cross the lake this afternoon and 
evening. 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.


loz063-071600-
lake ontario open waters from hamlin beach to sodus bay-
402 am est sun dec 7 2025

.today...east winds 5 to 15 knots becoming west 15 to 20 knots. a
chance of snow early, then snow from late morning on. waves 1 to
3 feet. 
.tonight...northwest winds 15 to 20 knots becoming north. a
chance of snow showers 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 foot or less. 
.monday night...west winds 5 to 15 knots becoming south 15 to
20 knots. waves 1 to 3 feet. 
.tuesday...south winds 15 to 25 knots becoming southwest. snow
showers likely during the day, then rain showers with snow
showers likely tuesday night. waves 3 to 5 feet building to 4 to
7 feet. waves occasionally around 9 feet. 
.wednesday...south winds to 30 knots becoming northwest. rain
showers during the day, then rain showers with a chance of snow
showers wednesday night. waves 3 to 6 feet building to 6 to
9 feet. waves occasionally around 11 feet. 
.thursday...west winds 15 to 25 knots. a chance of snow showers.
waves 4 to 7 feet subsiding to 3 to 6 feet. waves occasionally
around 9 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 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 30.0 inch surface low forming over the western 
lake erie waters this morning will cross the lake this afternoon and 
evening. 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.


loz064-065-071600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est sun dec 7 2025

.today...northeast winds 10 to 15 knots becoming northwest. snow
from late morning on. 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
402 am est sun dec 7 2025


slz022-071600-
saint lawrence river from cape vincent to ogdensburg-
402 am est sun dec 7 2025

.today...northeast winds 10 knots or less. snow from late morning
on. 
.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
402 am est sun dec 7 2025


slz024-071600-
saint lawrence river from ogdensburg to saint regis-
402 am est sun dec 7 2025

.today...northeast winds less than 10 knots. a chance of snow
late this morning. 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. 

$$