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open lake forecast for lake ontario
national weather service buffalo ny
402 am est mon dec 15 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...low pressure will rapidly strengthen to 28.5 inches as 
it moves northeast across newfoundland today. meanwhile, a 30.4 inch 
high will continue to settle over the southeastern states today 
before moving off the southeast coast tuesday. a strong 29.0 inch 
low over northwest ontario province tuesday afternoon will move east 
to northern quebec by wednesday, with a trailing cold front crossing 
the lake wednesday. another strong 29.0 inch low near lake superior 
thursday will move to northern quebec by friday, with a trailing 
strong cold front crossing the lake late thursday night.


loz063-151600-
lake ontario open waters from hamlin beach to sodus bay-
402 am est mon dec 15 2025

.today...west winds 15 to 25 knots. lake effect snow showers
likely early, then lake effect snow. lake effect snow showers
likely late. waves 2 to 4 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.tonight...southwest winds 15 to 25 knots. scattered snow showers
through the early overnight. waves 5 to 9 feet subsiding to 3 to
6 feet. waves occasionally around 11 feet. 
.tuesday...southwest winds 15 to 20 knots. waves 3 to 6 feet
subsiding to 2 to 4 feet. 
.tuesday night...south winds 15 to 25 knots becoming southwest to
30 knots. waves 2 to 4 feet building to 6 to 9 feet. waves
occasionally around 11 feet. 
.wednesday...southwest winds to 30 knots becoming south 15 to
25 knots. waves 9 to 12 feet subsiding to 2 to 4 feet. waves
occasionally around 15 feet. 
.thursday...south winds to 30 knots becoming southwest and
increasing to 35 knot gales. rain showers likely during the day,
then rain showers with snow showers likely thursday night. waves
4 to 7 feet building to 11 to 15 feet. waves occasionally around
19 feet. 
.friday...west gales to 40 knots diminishing to 10 to 15 knots.
snow showers likely during the day. waves 13 to 17 feet subsiding
to 3 to 6 feet. waves occasionally around 22 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am est mon dec 15 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...low pressure will rapidly strengthen to 28.5 inches as 
it moves northeast across newfoundland today. meanwhile, a 30.4 inch 
high will continue to settle over the southeastern states today 
before moving off the southeast coast tuesday. a strong 29.0 inch 
low over northwest ontario province tuesday afternoon will move east 
to northern quebec by wednesday, with a trailing cold front crossing 
the lake wednesday. another strong 29.0 inch low near lake superior 
thursday will move to northern quebec by friday, with a trailing 
strong cold front crossing the lake late thursday night.


loz064-065-151600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est mon dec 15 2025

.today...northwest winds 15 to 25 knots becoming west. scattered
snow showers early, then lake effect snow from late morning on.
waves 2 to 4 feet building to 5 to 8 feet. waves occasionally
around 10 feet. 
.tonight...west winds 15 to 25 knots. lake effect snow through
the early overnight, then lake effect snow showers likely late.
waves 5 to 9 feet subsiding to 4 to 7 feet. waves occasionally
around 11 feet. 
.tuesday...southwest winds 15 to 25 knots becoming south. lake
effect snow showers likely in the morning. waves 3 to 6 feet. 
.tuesday night...south winds 15 to 25 knots increasing to
30 knots. waves 3 to 6 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.wednesday...southwest winds to 30 knots becoming south 15 to
25 knots. a chance of rain showers during the day. waves 9 to
13 feet subsiding to 3 to 5 feet. waves occasionally around
16 feet. 
.thursday...south winds to 30 knots becoming southwest and
increasing to 35 knot gales. rain showers likely during the day,
then rain and snow showers thursday night. waves 5 to 8 feet
building to 10 to 15 feet. waves occasionally around 19 feet. 
.friday...west gales to 35 knots becoming northwest and
diminishing to 15 to 20 knots. snow and rain showers during the
day. waves 13 to 17 feet subsiding to 3 to 6 feet. waves
occasionally around 22 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est mon dec 15 2025


slz022-151600-
saint lawrence river from cape vincent to ogdensburg-
402 am est mon dec 15 2025

.today...west winds 5 to 10 knots becoming southwest. scattered
snow showers this afternoon. 
.tonight...southwest winds 5 to 15 knots. scattered snow showers
in the evening. 
.tuesday...southwest winds 5 to 15 knots becoming south. a chance
of snow showers. 
.tuesday night...south winds 15 to 20 knots. mostly cloudy. 
.wednesday...southwest winds 15 to 20 knots becoming south 5 to
15 knots. a chance of rain showers during the day. 
.thursday...south winds 15 to 25 knots becoming southwest. a
chance of rain showers during the day, then rain and snow showers
thursday night. 
.friday...west winds 15 to 20 knots diminishing to 5 to 15 knots.
snow showers during the day. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est mon dec 15 2025


slz024-151600-
saint lawrence river from ogdensburg to saint regis-
402 am est mon dec 15 2025

.today...west winds 10 knots or less becoming southwest.
scattered snow showers this afternoon. 
.tonight...southwest winds 5 to 10 knots. mostly cloudy. 
.tuesday...southwest winds 5 to 15 knots becoming south 15 to
20 knots. partly sunny in the morning, then becoming mostly
cloudy. 
.tuesday night...south winds 15 to 25 knots becoming southwest.
mostly cloudy. 
.wednesday...southwest winds 15 to 25 knots becoming south and
diminishing to 5 to 15 knots. a chance of rain and snow showers
during the day. 
.thursday...south winds 10 to 15 knots becoming southwest and
increasing to 30 knots. a chance of rain showers during the day,
then rain and snow showers thursday night. 
.friday...southwest winds 15 to 25 knots becoming west and
diminishing to less than 10 knots. snow showers during the day. 

$$