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open lake forecast for lake ontario
national weather service buffalo ny
221 am est sat nov 29 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 29.5 inch surface low over eastern quebec this evening 
will slide to newfoundland overnight. meanwhile, a 30.5 inch surface 
high will build south into the mid-mississippi valley tonight, then 
to the ohio valley and lower great lakes saturday. another surface 
low will cut northeastward through the central great lakes sunday, 
slowly deepening from 29.6 inches sunday morning to 29.4 inches 
sunday night over western quebec. a cold front from this low will 
cross the lake late sunday night. a 30.4 inch surface high centered 
over the central plains will then build east across the great lakes 
monday, sliding quickly to new england on tuesday. a 29.7 inch 
surface low off the carolina coastline tuesday morning will deepen 
to 28.9 inches over southern atlantic canada by wednesday.


loz064-065-291000-
lake ontario open waters from sodus bay to the saint lawrence
river-
221 am est sat nov 29 2025

...gale watch in effect from sunday morning through monday
morning...

.overnight...northwest winds 20 to 25 knots. waves 7 to
11 feet. waves occasionally around 14 feet. 
.saturday...northwest winds 15 to 25 knots becoming west and
diminishing to 5 to 15 knots. waves 5 to 8 feet subsiding to 2 to
4 feet. waves occasionally around 10 feet. 
.saturday night...southwest winds less than 10 knots becoming
southeast and increasing to 30 knots overnight. snow showers
overnight. waves 1 to 3 feet building to 3 to 6 feet. 
.sunday...south winds to 30 knots becoming southwest and
increasing to 35 knot gales in the afternoon. snow and rain
showers. waves 5 to 8 feet building to 10 to 13 feet. waves
occasionally around 16 feet. 
.sunday night...southwest gales to 35 knots becoming northwest
and diminishing to 30 knots overnight. rain and snow showers in
the evening, then snow showers, rain showers with a chance of
freezing rain overnight. waves 10 to 15 feet. waves occasionally
around 19 feet. 
.monday...northwest winds to 30 knots becoming south and
diminishing to 15 to 20 knots. a chance of freezing rain during
the day, then a chance of snow showers monday night. waves 9 to
12 feet subsiding to 1 to 3 feet. waves occasionally around
15 feet. 
.tuesday...south winds 15 to 20 knots becoming north 10 to
15 knots. snow showers. waves 1 to 3 feet. 
.wednesday...west winds 10 to 15 knots increasing to 30 knots. a
chance of snow showers during the day, then snow showers likely
wednesday night. waves 1 to 3 feet building to 5 to 9 feet. waves
occasionally around 11 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
221 am est sat nov 29 2025


slz022-291000-
saint lawrence river from cape vincent to ogdensburg-
221 am est sat nov 29 2025

.overnight...west winds 10 to 15 knots. partly cloudy. 
.saturday...west winds 10 knots or less. sunny.
.saturday night...light and variable winds becoming southeast
10 to 15 knots. snow showers overnight. 
.sunday...southeast winds 10 to 15 knots becoming south 15 to
20 knots. snow showers in the morning, then rain and snow showers
in the afternoon. 
.sunday night...southwest winds 15 to 20 knots becoming west
10 to 15 knots. rain and snow showers in the evening, then snow
showers, rain showers with a chance of freezing rain overnight. 
.monday...northwest winds 5 to 15 knots becoming south 10 knots
or less. a chance of freezing rain during the day, then a chance
of snow showers monday night. 
.tuesday...south winds 10 knots or less becoming northwest. snow
showers likely. 
.wednesday...southwest winds 10 knots or less becoming west 10 to
15 knots. snow showers likely wednesday night. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
221 am est sat nov 29 2025


slz024-291000-
saint lawrence river from ogdensburg to saint regis-
221 am est sat nov 29 2025

.overnight...west winds 15 to 20 knots. mostly cloudy. 
.saturday...west winds 5 to 15 knots diminishing to less than
10 knots. mostly sunny. 
.saturday night...light and variable winds becoming southeast
5 to 10 knots. snow showers likely overnight. 
.sunday...southeast winds 5 to 15 knots becoming south. snow
showers in the morning, then snow and rain showers in the
afternoon. 
.sunday night...southwest winds 15 to 20 knots becoming west.
rain and snow showers in the evening, then snow showers
overnight. 
.monday...west winds 15 to 20 knots becoming south and
diminishing to less than 10 knots. a chance of snow showers
monday night. 
.tuesday...south winds 10 knots or less becoming northwest. snow
showers likely during the day, then a chance of snow showers
tuesday night. 
.wednesday...southwest winds 10 knots or less becoming west 10 to
15 knots. snow showers likely wednesday night. 

$$