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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est sun nov 23 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 low over quebec will weaken as it 
continues to track east tonight. its earlier passing cold front 
across the lake and forcing are helping with the shower potential 
over/near the lake through tonight. a 30.2 inch high is then 
forecast to build across the ohio valley monday. on tuesday a 29.5 
inch low over the upper midwest will track toward the central great 
lakes. the sfc low will then track into eastern ontario through 
wednesday night, swinging a cold front across the lake by later 
wednesday. the surface low will then track well north of the lake 
thursday and friday.


loz063-240400-
lake ontario open waters from hamlin beach to sodus bay-
402 pm est sun nov 23 2025

.tonight...west winds to 30 knots becoming northwest and
diminishing to 15 to 20 knots. showers likely this evening, then
a chance of showers after midnight. waves 6 to 10 feet subsiding
to 5 to 8 feet. waves occasionally around 13 feet. 
.monday...northwest winds 15 to 20 knots becoming south 5 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.monday night...south winds 10 to 15 knots. waves 2 feet or less.
.tuesday...south winds 5 to 15 knots becoming southeast. showers
likely in the afternoon. waves 2 feet or less. 
.tuesday night...southeast winds 5 to 15 knots becoming south.
showers likely. waves 2 feet or less. 
.wednesday...south winds 10 to 15 knots becoming west and
increasing to 35 knot gales. rain showers likely during the day,
then lake effect rain and snow showers likely wednesday night.
waves 1 to 2 feet building to 10 to 15 feet. waves occasionally
around 19 feet. 
.thursday...west gales to 35 knots. lake effect snow and rain
showers likely during the day, then lake effect snow showers
likely thursday night. waves 12 to 17 feet subsiding to 11 to
15 feet. waves occasionally around 22 feet. 
.friday...west gales to 35 knots becoming northwest. lake effect
snow showers likely. waves 10 to 13 feet subsiding to 7 to
10 feet. waves occasionally around 16 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est sun nov 23 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 low over quebec will weaken as it 
continues to track east tonight. its earlier passing cold front 
across the lake and forcing are helping with the shower potential 
over/near the lake through tonight. a 30.2 inch high is then 
forecast to build across the ohio valley monday. on tuesday a 29.5 
inch low over the upper midwest will track toward the central great 
lakes. the sfc low will then track into eastern ontario through 
wednesday night, swinging a cold front across the lake by later 
wednesday. the surface low will then track well north of the lake 
thursday and friday.


loz064-065-240400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est sun nov 23 2025

.tonight...west winds to 30 knots becoming northwest and
diminishing to 15 to 20 knots. rain showers likely early, then a
chance of rain showers late this evening. waves 6 to 10 feet
subsiding to 5 to 8 feet. waves occasionally around 13 feet. 
.monday...northwest winds 15 to 20 knots becoming southwest 5 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.monday night...south winds 10 to 15 knots. waves 1 to 3 feet. 
.tuesday...south winds 10 to 15 knots becoming southeast. showers
likely in the afternoon. waves 1 to 3 feet. 
.tuesday night...southeast winds 10 to 15 knots becoming south.
showers. waves 1 to 2 feet. 
.wednesday...south winds 10 to 15 knots becoming west and
increasing to 35 knot gales. rain showers during the day, then
lake effect rain showers with lake effect snow showers likely
wednesday night. waves 1 to 2 feet building to 10 to 15 feet.
waves occasionally around 19 feet. 
.thursday...west gales to 35 knots. lake effect rain and snow
showers likely during the day, then lake effect snow showers
likely thursday night. waves 12 to 17 feet subsiding to 11 to
15 feet. waves occasionally around 22 feet. 
.friday...northwest gales to 35 knots diminishing to 15 to
25 knots. lake effect snow showers likely. waves 10 to 14 feet
subsiding to 7 to 10 feet. waves occasionally around 18 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 nov 23 2025


slz022-240400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est sun nov 23 2025

.tonight...west winds 5 to 15 knots. a chance of rain showers
this evening. 
.monday...west winds 5 to 10 knots becoming southwest. partly
sunny. 
.monday night...south winds 5 to 10 knots. cloudy.
.tuesday...south winds 10 knots or less becoming southeast. rain
showers likely in the afternoon. 
.tuesday night...southeast winds less than 10 knots. rain showers
likely. 
.wednesday...south winds 5 to 15 knots becoming southwest and
increasing to 15 to 25 knots. rain showers during the day, then
rain showers with a chance of snow showers wednesday night. 
.thursday...southwest winds 15 to 25 knots becoming west. a
chance of snow and rain showers during the day, then a chance of
snow showers thursday night. 
.friday...west winds 5 to 15 knots. a chance of snow 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 nov 23 2025


slz024-240400-
saint lawrence river from ogdensburg to saint regis-
402 pm est sun nov 23 2025

.tonight...southwest winds 10 knots or less becoming west. a
chance of rain and snow showers early, then a chance of rain
showers late this evening. 
.monday...west winds 5 to 10 knots becoming southwest. mostly
cloudy early, then becoming partly sunny. 
.monday night...southwest winds 5 to 10 knots. mostly cloudy. 
.tuesday...southwest winds 10 knots or less becoming southeast. a
chance of rain showers in the afternoon. 
.tuesday night...light and variable winds. rain showers likely. 
.wednesday...east winds 10 knots or less becoming southwest and
increasing to 15 to 20 knots. rain showers during the day, then
rain showers with a chance of snow showers wednesday night. 
.thursday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. a chance of snow showers. 
.friday...west winds 5 to 15 knots. mostly cloudy. 

$$