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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm est sat dec 20 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 high over the lower great lakes will drift 
off the atlantic coastline tonight. a 29.5 inch low moving across 
ontario and quebec will push its attendant cold front across the 
lake sunday. a large 30.6 inch high will then build east across the 
lake monday. a 29.8 inch low just north of lake superior tuesday 
will pass north of the lake, resulting in a pair of fronts passing 
across the region.


loz064-065-211000-
lake ontario open waters from sodus bay to the saint lawrence
river-
1002 pm est sat dec 20 2025

...gale warning in effect through sunday evening...

.overnight...southwest winds to 30 knots becoming west and
increasing to 35 knot gales. a chance of rain
showers. waves 7 to 10 feet building to 13 to 17 feet. waves
occasionally around 22 feet. 
.sunday...west gales to 35 knots. a chance of snow showers early,
then lake effect snow. a chance of snow showers late. waves 13 to
18 feet subsiding to 12 to 16 feet. waves occasionally around
23 feet. 
.sunday night...northwest winds to 30 knots diminishing to 15 to
20 knots. a chance of snow showers in the evening. waves 11 to
15 feet subsiding to 3 to 6 feet. waves occasionally around
19 feet. 
.monday...west winds 15 to 20 knots. waves 3 to 5 feet. 
.monday night...west winds 10 to 15 knots becoming southeast
15 to 20 knots. a chance of snow showers in the evening, then
snow showers overnight. waves 3 to 5 feet subsiding to 2 to
4 feet. 
.tuesday...south winds 15 to 20 knots becoming northwest and
increasing to 30 knots. rain and snow showers during the day,
then rain showers likely with a chance of snow showers tuesday
night. waves 3 to 5 feet building to 8 to 11 feet. waves
occasionally around 14 feet. 
.wednesday...northwest winds 15 to 20 knots becoming south 5 to
15 knots. a chance of rain and snow showers wednesday night.
waves 4 to 7 feet subsiding to 1 to 3 feet. waves occasionally
around 9 feet. 
.thursday...south winds 10 to 15 knots increasing to 15 to
20 knots. a chance of rain showers during the day, then rain
showers likely thursday night. waves 1 to 3 feet building to 2 to
4 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm est sat dec 20 2025


slz022-211000-
saint lawrence river from cape vincent to ogdensburg-
1002 pm est sat dec 20 2025

.rest of tonight...southwest winds 15 to 20 knots. rain showers
likely late this evening, then a chance of rain and snow showers
after midnight. 
.sunday...west winds 15 to 20 knots diminishing to 10 to
15 knots. mostly sunny in the morning, then becoming mostly
cloudy. 
.sunday night...northwest winds 10 knots or less becoming west.
partly cloudy. 
.monday...southwest winds 10 knots or less. mostly cloudy. 
.monday night...southwest winds 10 knots or less becoming south.
a chance of snow showers in the evening, then snow showers likely
overnight. 
.tuesday...southeast winds 5 to 15 knots becoming northwest. snow
showers with rain showers likely. 
.wednesday...northwest winds 10 knots or less becoming south.
mostly cloudy. 
.thursday...south winds 10 knots or less. a chance of snow and
rain showers during the day, then rain and snow showers likely
thursday night. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm est sat dec 20 2025


slz024-211000-
saint lawrence river from ogdensburg to saint regis-
1002 pm est sat dec 20 2025

.rest of tonight...southwest winds 10 to 15 knots increasing to
15 to 20 knots. a chance of rain and snow showers. 
.sunday...west winds 15 to 20 knots. partly sunny. 
.sunday night...northwest winds 15 to 20 knots becoming west 5 to
15 knots. partly cloudy. 
.monday...southwest winds 5 to 10 knots. mostly cloudy. 
.monday night...southwest winds less than 10 knots becoming
southeast. snow showers likely overnight. 
.tuesday...southeast winds 5 to 15 knots becoming northwest. snow
showers. 
.wednesday...northwest winds 10 to 15 knots becoming south less
than 10 knots. mostly cloudy. 
.thursday...south winds 10 knots or less. a chance of snow
showers during the day, then snow showers likely thursday night. 

$$