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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est tue dec 9 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 29.2 inch low will approach the region tonight and 
move just northwest of the lake wednesday. the region will be 
situated between a 29.1 inch low over the canadian maritimes and a 
30.1 inch high over the southern plains thursday. a 29.9 inch ridge 
of high pressure is expected to move into the great lakes region 
friday. a 29.8 inch low may move north of the lake on saturday, then 
30.2 inches will average across the lower great lakes region between 
the departing low to the east and a 30.7 inch high over the plains 
sunday.


loz064-065-100400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est tue dec 9 2025

.tonight...south winds to 30 knots. snow likely early, then a
chance of snow showers. snow and rain late. waves 5 to 8 feet.
waves occasionally around 10 feet. 
.wednesday...south winds 20 to 25 knots becoming southwest. snow
early, then snow and rain late in the morning. rain in the
afternoon. waves 3 to 6 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.wednesday night...west winds to 30 knots. rain and snow in the
evening, then a chance of snow showers overnight. waves 5 to
9 feet building to 7 to 10 feet. waves occasionally around
13 feet. 
.thursday...west winds to 30 knots. a chance of snow showers in
the morning, then lake effect snow showers likely in the
afternoon. waves 7 to 11 feet. waves occasionally around 14 feet.
.thursday night...northwest winds to 30 knots. snow showers
likely in the evening, then a chance of snow showers overnight.
waves 7 to 11 feet subsiding to 5 to 9 feet. waves occasionally
around 14 feet. 
.friday...west winds 15 to 20 knots becoming southwest. a chance
of snow showers during the day, then snow showers likely friday
night. waves 4 to 7 feet subsiding to 2 to 4 feet. waves
occasionally around 9 feet. 
.saturday...southwest winds to 30 knots becoming west 15 to
25 knots. snow showers likely. waves 4 to 7 feet building to 8 to
11 feet, then subsiding to 6 to 9 feet. waves occasionally around
14 feet. 
.sunday...northwest winds 15 to 25 knots. snow showers likely
during the day, then a chance of snow showers sunday 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 pm est tue dec 9 2025


slz022-100400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est tue dec 9 2025

.tonight...south winds 15 to 20 knots diminishing to 10 to
15 knots. snow likely early, then a chance of snow showers late
this evening. snow after midnight. 
.wednesday...south winds 10 knots or less. snow in the morning,
then snow and rain in the afternoon. 
.wednesday night...southwest winds 10 knots or less becoming west
10 to 15 knots. snow and rain in the evening, then a chance of
snow showers overnight. 
.thursday...west winds 10 to 15 knots. a chance of snow showers. 
.thursday night...west winds 5 to 10 knots. a chance of snow
showers in the evening. 
.friday...west winds 10 knots or less becoming south. a chance of
snow showers friday night. 
.saturday...south winds 5 to 10 knots becoming west. snow showers
likely. 
.sunday...northwest winds 10 knots or less. snow showers likely
during the day, then a chance of snow showers sunday night. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est tue dec 9 2025


slz024-100400-
saint lawrence river from ogdensburg to saint regis-
402 pm est tue dec 9 2025

.tonight...south winds 5 to 10 knots. a chance of snow showers
this evening, then snow likely after midnight. 
.wednesday...southeast winds less than 10 knots. snow showers
likely early, then snow from late morning on. 
.wednesday night...light and variable winds becoming west 10 to
15 knots. snow.
.thursday...west winds 10 to 15 knots. snow showers likely in the
morning, then a chance of snow showers in the afternoon. 
.thursday night...west winds 5 to 15 knots. a chance of snow
showers. 
.friday...southwest winds 10 knots or less becoming south. a
chance of snow showers friday night. 
.saturday...south winds 10 knots or less becoming west. snow
showers likely. 
.sunday...west winds 5 to 10 knots. a chance of snow showers
during the day. 

$$