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open lake forecast for lake ontario
national weather service buffalo ny
402 am est tue nov 25 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 29.7 inch low over the upper midwest today will track 
toward the central great lakes wednesday, then track into eastern 
ontario through wednesday night while deepening to 29.4 inches. a 
cold front from this low will rush across the lake wednesday 
afternoon. the 29.4 inch surface low will then track well north of 
the lake thursday and friday, as a 30.4 inch surface high builds 
into the mid mississippi valley friday and to the ohio valley 
saturday.


loz064-065-251600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est tue nov 25 2025

...gale warning in effect from wednesday afternoon through friday
evening...

.today...south winds 15 to 20 knots becoming southeast 10 to
15 knots. a chance of showers early this afternoon. showers late.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tonight...southeast winds 10 to 15 knots becoming south. showers
early, then a chance of showers late in the evening. showers
likely after midnight. waves 1 to 2 feet. 
.wednesday...south winds 10 to 15 knots becoming southwest and
increasing to 30 knots in the afternoon. showers. waves 1 to
3 feet building to 5 to 8 feet. waves occasionally around
10 feet. 
.wednesday night...west gales to 40 knots becoming southwest to
35 knots. rain showers. waves 11 to 16 feet building to 13 to
17 feet. waves occasionally around 22 feet. 
.thursday...southwest gales to 40 knots becoming west to
35 knots. rain and snow showers. waves 15 to 20 feet building to
16 to 21 feet, then subsiding to 13 to 17 feet. waves
occasionally around 27 feet. 
.friday...west gales to 35 knots becoming northwest and
diminishing to 15 to 25 knots. snow showers during the day, then
a chance of snow showers friday night. waves 10 to 15 feet
subsiding to 7 to 10 feet. waves occasionally around 19 feet. 
.saturday...northwest winds 15 to 20 knots becoming south. a
chance of snow showers. waves 4 to 7 feet subsiding to 1 to
3 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 am est tue nov 25 2025


slz022-251600-
saint lawrence river from cape vincent to ogdensburg-
402 am est tue nov 25 2025

.today...south winds 5 to 15 knots. a chance of rain showers
late. 
.tonight...southeast winds less than 10 knots. showers.
.wednesday...southeast winds 10 knots or less becoming southwest
and increasing to 15 to 20 knots in the afternoon. showers.
.wednesday night...southwest winds 15 to 25 knots. rain showers
in the evening, then rain and snow showers likely overnight. 
.thursday...southwest winds to 30 knots becoming west and
diminishing to 10 to 15 knots. rain and snow showers likely
during the day, then snow showers likely thursday night. 
.friday...west winds 5 to 15 knots. a chance of snow showers
during the day. 
.saturday...west winds 10 knots or less becoming southeast. a
chance of snow showers saturday night. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est tue nov 25 2025


slz024-251600-
saint lawrence river from ogdensburg to saint regis-
402 am est tue nov 25 2025

.today...southwest winds 5 to 15 knots becoming south less than
10 knots. mostly cloudy. 
.tonight...light and variable winds. rain showers. 
.wednesday...east winds 10 knots or less becoming south and
increasing to 15 to 20 knots in the afternoon. rain showers. 
.wednesday night...southwest winds 15 to 25 knots increasing to
30 knots. rain showers in the evening, then rain showers likely
with a chance of snow showers overnight. 
.thursday...southwest winds to 30 knots becoming west and
diminishing to 15 to 20 knots. rain and snow showers likely
during the day, then snow showers likely thursday night. 
.friday...west winds 15 to 20 knots diminishing to 10 to
15 knots. snow showers likely during the day. 
.saturday...west winds 10 knots or less becoming southeast. a
chance of snow showers saturday night. 

$$