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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est sun dec 28 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 ridge of high pressure averaging 30.1 inches will 
weaken over eastern quebec through this evening. low pressure 
averaging 29.1 inches will then cross the lower great lakes tonight, 
before moving to northern new england and southern quebec monday, 
then to the canadian maritimes by tuesday while deepening to 28.8 
inches. a trough averaging 29.6 inches, will drop southward across 
the lake thursday.


loz065-290400-
lake ontario open waters from mexico bay to the saint lawrence
river-
402 pm est sun dec 28 2025

...storm warning in effect from monday afternoon through monday
evening...

.tonight...southeast winds 15 to 25 knots. rain showers. waves
1 to 3 feet building to 3 to 6 feet. 
.monday...south winds to 30 knots becoming southwest and
increasing to 45 knot gales in the afternoon. rain showers with a
chance of snow showers in the morning, then snow showers with a
chance of rain showers in the afternoon. waves 6 to 9 feet
building to 17 to 22 feet. waves occasionally around 28 feet. 
.monday night...southwest storm force winds to 50 knots becoming
west and diminishing to 45 knot gales overnight. snow showers.
waves 18 to 23 feet subsiding to 15 to 20 feet. waves
occasionally around 29 feet. 
.tuesday...west gales to 40 knots. snow showers. waves 14 to
18 feet subsiding to 13 to 17 feet. waves occasionally around
23 feet. 
.tuesday night...west gales to 40 knots diminishing to 30 knots.
a chance of snow showers in the evening, then lake effect snow
showers overnight. waves 12 to 16 feet subsiding to 7 to 10 feet.
waves occasionally around 20 feet. 
.wednesday...west winds to 30 knots becoming northwest and
diminishing to 15 to 20 knots. lake effect snow showers. waves
7 to 11 feet subsiding to 3 to 6 feet. waves occasionally around
14 feet. 
.thursday...northwest winds 10 to 15 knots becoming west. snow
showers likely during the day, then a chance of snow showers
thursday night. waves 2 to 4 feet building to 3 to 6 feet. 
.friday...west winds 15 to 20 knots. a chance of lake effect snow
showers. waves 3 to 6 feet building to 4 to 7 feet. waves
occasionally around 9 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 28 2025


slz022-290400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est sun dec 28 2025

.tonight...northeast winds 10 knots or less becoming east 10 to
15 knots. freezing rain this evening, then rain showers and
freezing rain after midnight. 
.monday...southeast winds 15 to 25 knots becoming southwest to
30 knots. rain showers, a chance of snow showers and freezing
rain in the morning, then snow showers with a chance of rain
showers in the afternoon. 
.monday night...southwest winds to 30 knots becoming west 15 to
25 knots. snow showers. 
.tuesday...west winds 15 to 25 knots. snow showers likely in the
morning, then a chance of snow showers in the afternoon. 
.tuesday night...west winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of snow showers overnight. 
.wednesday...southwest winds 5 to 15 knots becoming west less
than 10 knots. snow showers likely. 
.thursday...west winds less than 10 knots becoming southwest. a
chance of snow showers. 
.friday...southwest winds 10 knots or less. 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 28 2025


slz024-290400-
saint lawrence river from ogdensburg to saint regis-
402 pm est sun dec 28 2025

.tonight...northeast winds 5 to 15 knots becoming east. freezing
rain. 
.monday...east winds 15 to 20 knots becoming southwest and
increasing to 30 knots. rain showers and freezing rain early,
then rain showers likely late in the morning. snow showers likely
with a chance of rain showers in the afternoon. 
.monday night...southwest winds to 30 knots becoming west. snow
showers. 
.tuesday...west winds to 30 knots diminishing to 15 to 25 knots.
snow showers in the morning, then a chance of snow showers in the
afternoon. 
.tuesday night...west winds 15 to 25 knots diminishing to 10 to
15 knots. a chance of snow showers overnight. 
.wednesday...southwest winds 5 to 15 knots becoming west. snow
showers likely. 
.thursday...southwest winds 10 knots or less. mostly cloudy. 
.friday...southwest winds 10 knots or less. a chance of snow
showers. 

$$