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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est mon dec 1 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 30.1 inch surface high centered just to the east of 
the lake this evening will slide quickly to new england on tuesday. 
a 29.6 inch surface low off the carolina coastline tuesday morning 
will deepen to 28.9 inches over southern atlantic canada by early 
wednesday morning before going out to sea. a 30.2 inch surface high 
will build across the ohio valley and lower great lakes later 
wednesday into thursday morning before pushing off the coast. a 
large 29.2 inch surface low near hudson bay will push its cold front 
across the lake wednesday night, with another 30.4 inch high 
building in its wake thursday night. the high will then quickly move 
east of the lake friday. another cold front will cross the lake late 
saturday and saturday night, this from a 29.3 inch low near 
northern james bay.


loz063-020400-
lake ontario open waters from hamlin beach to sodus bay-
402 pm est mon dec 1 2025

.tonight...southwest winds 10 knots or less becoming southeast
10 to 15 knots. a chance of snow showers after midnight. snow
late. waves 1 to 3 feet. 
.tuesday...southeast winds 5 to 15 knots becoming north. snow in
the morning, then a chance of snow showers early in the
afternoon. a chance of snow and rain showers late. waves 1 to
3 feet. 
.tuesday night...north winds 10 to 15 knots becoming west. a
chance of snow showers. waves 1 to 3 feet. 
.wednesday...southwest winds 15 to 25 knots. a chance of snow
showers in the morning. waves 2 to 4 feet building to 4 to
7 feet. waves occasionally around 9 feet. 
.wednesday night...southwest winds to 30 knots becoming west.
snow showers. waves 5 to 9 feet building to 7 to 11 feet. waves
occasionally around 14 feet. 
.thursday...northwest winds to 30 knots becoming west and
diminishing to 10 to 15 knots. snow showers during the day. waves
7 to 11 feet subsiding to 3 to 6 feet. waves occasionally around
14 feet. 
.friday...southwest winds 15 to 20 knots. waves 2 to 4 feet. 
.saturday...southwest winds 15 to 20 knots becoming west. a
chance of snow showers. waves 2 to 4 feet building to 3 to
5 feet, then subsiding to 2 to 4 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est mon dec 1 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 30.1 inch surface high centered just to the east of 
the lake this evening will slide quickly to new england on tuesday. 
a 29.6 inch surface low off the carolina coastline tuesday morning 
will deepen to 28.9 inches over southern atlantic canada by early 
wednesday morning before going out to sea. a 30.2 inch surface high 
will build across the ohio valley and lower great lakes later 
wednesday into thursday morning before pushing off the coast. a 
large 29.2 inch surface low near hudson bay will push its cold front 
across the lake wednesday night, with another 30.4 inch high 
building in its wake thursday night. the high will then quickly move 
east of the lake friday. another cold front will cross the lake late 
saturday and saturday night, this from a 29.3 inch low near 
northern james bay.


loz064-065-020400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est mon dec 1 2025

.tonight...southwest winds 10 knots or less becoming southeast
10 to 15 knots. a chance of snow showers after midnight. snow
late. waves 1 to 3 feet. 
.tuesday...southeast winds 5 to 15 knots becoming northeast. snow
in the morning, then a chance of snow showers in the afternoon.
waves 1 to 3 feet. 
.tuesday night...north winds 10 to 15 knots becoming northwest. a
chance of snow showers in the evening, then a chance of snow and
rain showers overnight. waves 1 to 3 feet. 
.wednesday...southwest winds 15 to 25 knots increasing to
30 knots. a chance of snow and rain showers in the morning, then
a chance of snow showers in the afternoon. waves 1 to 3 feet
building to 5 to 8 feet. waves occasionally around 10 feet. 
.wednesday night...southwest winds to 30 knots becoming west.
snow showers. waves 6 to 10 feet building to 8 to 11 feet. waves
occasionally around 14 feet. 
.thursday...northwest winds to 30 knots becoming west and
diminishing to 15 to 20 knots. snow showers during the day. waves
7 to 11 feet subsiding to 3 to 6 feet. waves occasionally around
14 feet. 
.friday...south winds 15 to 25 knots. a chance of snow showers
friday night. waves 2 to 4 feet building to 3 to 6 feet. 
.saturday...southwest winds 15 to 20 knots becoming west. a
chance of 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 pm est mon dec 1 2025


slz022-020400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est mon dec 1 2025

.tonight...light and variable winds. snow likely late. 
.tuesday...southeast winds 10 knots or less becoming northeast.
snow in the morning, then a chance of snow showers early in the
afternoon. 
.tuesday night...northeast winds 5 to 10 knots becoming light and
variable. mostly cloudy. 
.wednesday...south winds 10 knots or less increasing to 15 to
20 knots. a chance of snow showers. 
.wednesday night...southwest winds 15 to 20 knots becoming west.
snow showers. 
.thursday...northwest winds 10 to 15 knots becoming southwest
less than 10 knots. snow showers likely during the day. 
.friday...south winds 5 to 15 knots. a chance of snow showers
friday night. 
.saturday...south 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 mon dec 1 2025


slz024-020400-
saint lawrence river from ogdensburg to saint regis-
402 pm est mon dec 1 2025

.tonight...light and variable winds. a chance of snow showers
late. 
.tuesday...light and variable winds. snow likely in the morning,
then a chance of snow showers early in the afternoon. 
.tuesday night...northeast winds less than 10 knots. mostly
cloudy. 
.wednesday...southwest winds 10 knots or less becoming south and
increasing to 15 to 20 knots. a chance of snow showers in the
afternoon. 
.wednesday night...southwest winds 15 to 20 knots becoming west.
snow showers. 
.thursday...west winds 15 to 20 knots becoming southwest 5 to
15 knots. snow showers during the day. 
.friday...south winds 5 to 10 knots. a chance of snow showers
friday night. 
.saturday...south winds 5 to 10 knots becoming west. a chance of
snow showers. 

$$