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open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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 move east of 
the lake through this evening. a 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, followed by a 29.6 inch low which may approach the 
lake from the northwest late friday.


loz063-080400-
lake ontario open waters from hamlin beach to sodus bay-
402 pm est sun dec 7 2025

.tonight...northwest winds 15 to 25 knots becoming north. a
chance of snow showers early. waves 3 to 6 feet building to 5 to
7 feet, then subsiding to 3 to 6 feet. waves occasionally around
9 feet. 
.monday...north winds 5 to 15 knots becoming northwest less than
10 knots. waves 3 to 5 feet subsiding to 1 foot or less. 
.monday night...west winds 5 to 15 knots becoming south. waves
1 to 3 feet. 
.tuesday...south winds 15 to 25 knots. snow showers likely in the
afternoon. waves 2 to 4 feet building to 3 to 6 feet. 
.tuesday night...southwest winds 15 to 25 knots. snow and rain
showers likely in the evening, then rain and snow overnight.
waves 3 to 6 feet building to 4 to 7 feet, then subsiding to 3 to
6 feet. waves occasionally around 9 feet. 
.wednesday...south winds to 30 knots becoming northwest. rain and
snow. waves 3 to 6 feet building to 6 to 10 feet. waves
occasionally around 13 feet. 
.thursday...northwest winds 15 to 25 knots. a chance of snow
showers. waves 5 to 8 feet subsiding to 3 to 5 feet. waves
occasionally around 10 feet. 
.friday...northwest winds 15 to 20 knots becoming west. a chance
of snow showers. waves 3 to 6 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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 move east of 
the lake through this evening. a 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, followed by a 29.6 inch low which may approach the 
lake from the northwest late friday.


loz064-065-080400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est sun dec 7 2025

.tonight...north winds 15 to 25 knots. snow likely early. waves
3 to 6 feet building to 4 to 7 feet, then subsiding to 3 to
6 feet. waves occasionally around 9 feet. 
.monday...north winds 15 to 20 knots becoming northwest and
diminishing to less than 10 knots in the afternoon. waves 3 to
5 feet subsiding to 1 foot or less. 
.monday night...west winds 10 knots or less becoming south and
increasing to 15 to 20 knots overnight. waves 1 to 3 feet. 
.tuesday...south winds 15 to 25 knots increasing to 30 knots.
snow showers likely in the afternoon. waves 3 to 6 feet building
to 6 to 9 feet. waves occasionally around 11 feet. 
.tuesday night...south winds to 30 knots becoming southwest. snow
and rain showers in the evening, then rain and snow overnight.
waves 5 to 9 feet. waves occasionally around 11 feet. 
.wednesday...south winds to 30 knots becoming northwest. rain and
snow. waves 4 to 7 feet building to 6 to 10 feet. waves
occasionally around 13 feet. 
.thursday...northwest winds 15 to 25 knots. snow showers likely.
waves 5 to 8 feet subsiding to 2 to 4 feet. waves occasionally
around 10 feet. 
.friday...northwest winds 15 to 20 knots. snow showers likely.
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 pm est sun dec 7 2025


slz022-080400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est sun dec 7 2025

.tonight...north winds 5 to 10 knots becoming northwest. a chance
of snow showers early. 
.monday...northwest winds less than 10 knots. sunny.
.monday night...light and variable winds becoming south 5 to
10 knots. partly to mostly cloudy. 
.tuesday...south winds 5 to 15 knots increasing to 15 to
20 knots. snow showers likely in the afternoon. 
.tuesday night...south winds 15 to 20 knots diminishing to 10 to
15 knots. snow showers in the evening, then snow and rain
overnight. 
.wednesday...south winds 5 to 15 knots becoming northwest. rain
and snow. 
.thursday...west winds 10 knots or less becoming northwest. a
chance of snow showers. 
.friday...northwest winds 5 to 10 knots becoming west. 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 pm est sun dec 7 2025


slz024-080400-
saint lawrence river from ogdensburg to saint regis-
402 pm est sun dec 7 2025

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

$$