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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est sun dec 14 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...an elongated 29.7 inch low will rapidly deepen to 28.6 
inches by monday as it steams towards newfoundland. a strong 30.9 
inch high over the mid mississippi valley will then settle across 
the southeast states through tuesday while weakening to 30.3 inches. 
a strong 29.0 inch low over the southern canadian prairies tuesday 
will move east to northern quebec by wednesday, with a trailing cold 
front crossing the lake wednesday. thursday an area of low pressure 
deepening to 29.2 inches will cross the central great lakes, with 
this low deepening further thursday night to 29.0 inches as it 
tracks towards southwestern quebec.


loz063-150400-
lake ontario open waters from hamlin beach to sodus bay-
402 pm est sun dec 14 2025

.tonight...northwest winds 15 to 25 knots. scattered flurries
early, then scattered snow showers. lake effect snow likely late.
waves 4 to 7 feet subsiding to 3 to 6 feet. waves occasionally
around 9 feet. 
.monday...west winds 15 to 20 knots increasing to 30 knots. lake
effect snow. waves 2 to 4 feet building to 5 to 9 feet. waves
occasionally around 11 feet. 
.monday night...west winds 15 to 25 knots. lake effect snow in
the evening, then a chance of snow showers overnight. waves 6 to
9 feet subsiding to 3 to 6 feet. waves occasionally around
11 feet. 
.tuesday...southwest winds 15 to 20 knots. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.tuesday night...southwest winds 15 to 25 knots increasing to
30 knots. waves 2 to 4 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.wednesday...southwest winds to 30 knots becoming south and
diminishing to 15 to 20 knots. waves 7 to 11 feet subsiding to
2 to 4 feet. waves occasionally around 14 feet. 
.thursday...south winds to 30 knots becoming southwest and
increasing to 40 knot gales. rain likely during the day, then
rain with snow likely thursday night. waves 3 to 6 feet building
to 11 to 15 feet. waves occasionally around 19 feet. 
.friday...west gales to 45 knots diminishing to 15 to 25 knots. a
chance of rain and snow showers during the day. waves 14 to
19 feet subsiding to 3 to 5 feet. waves occasionally around
24 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est sun dec 14 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...an elongated 29.7 inch low will rapidly deepen to 28.6 
inches by monday as it steams towards newfoundland. a strong 30.9 
inch high over the mid mississippi valley will then settle across 
the southeast states through tuesday while weakening to 30.3 inches. 
a strong 29.0 inch low over the southern canadian prairies tuesday 
will move east to northern quebec by wednesday, with a trailing cold 
front crossing the lake wednesday. thursday an area of low pressure 
deepening to 29.2 inches will cross the central great lakes, with 
this low deepening further thursday night to 29.0 inches as it 
tracks towards southwestern quebec.


loz064-065-150400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est sun dec 14 2025

.tonight...northwest winds 15 to 25 knots. scattered flurries
early, then scattered snow showers. snow likely late. waves 3 to
6 feet building to 4 to 7 feet, then subsiding to 3 to 6 feet.
waves occasionally around 9 feet. 
.monday...northwest winds 15 to 25 knots becoming west. lake
effect snow. waves 2 to 4 feet building to 6 to 9 feet. waves
occasionally around 11 feet. 
.monday night...west winds 15 to 25 knots. lake effect snow.
waves 5 to 9 feet subsiding to 3 to 6 feet. waves occasionally
around 11 feet. 
.tuesday...southwest winds 15 to 20 knots becoming south. lake
effect snow showers likely. waves 3 to 6 feet. 
.tuesday night...south winds 15 to 25 knots increasing to
30 knots. waves 3 to 6 feet building to 4 to 7 feet. waves
occasionally around 9 feet. 
.wednesday...southwest winds to 30 knots becoming south and
diminishing to 15 to 20 knots. a chance of rain showers during
the day. waves 7 to 11 feet subsiding to 2 to 4 feet. waves
occasionally around 14 feet. 
.thursday...south winds to 30 knots becoming southwest and
increasing to 40 knot gales. rain likely during the day, then
rain and snow thursday night. waves 4 to 7 feet building to 12 to
16 feet. waves occasionally around 20 feet. 
.friday...west gales to 40 knots becoming northwest and
diminishing to 15 to 20 knots. a chance of snow and rain showers
during the day. waves 15 to 19 feet subsiding to 3 to 5 feet.
waves occasionally around 24 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 14 2025


slz022-150400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est sun dec 14 2025

.tonight...northwest winds 10 knots or less becoming west. partly
to mostly cloudy. 
.monday...west winds 10 knots or less becoming southwest. a
chance of snow showers through early afternoon, then snow likely
late. 
.monday night...southwest winds 10 knots or less. a chance of
snow showers in the evening. 
.tuesday...southwest winds 10 knots or less becoming south 10 to
15 knots. a chance of snow showers. 
.tuesday night...south winds 10 to 15 knots increasing to 15 to
20 knots. mostly cloudy. 
.wednesday...southwest winds 15 to 20 knots becoming south 5 to
15 knots. mostly cloudy. 
.thursday...south winds 10 to 15 knots becoming southwest and
increasing to 15 to 25 knots. rain likely during the day, then
rain thursday night. 
.friday...southwest winds 15 to 20 knots becoming west 5 to
15 knots. a chance of snow and rain 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 pm est sun dec 14 2025


slz024-150400-
saint lawrence river from ogdensburg to saint regis-
402 pm est sun dec 14 2025

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

$$