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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 will move from northern ontario to james 
bay, sending its cold front across the lake this afternoon. a 30.2 
inch high is then forecast to build across the ohio valley monday. 
on tuesday a 29.5 inch low to the north of lake superior will swing 
a cold front across the lake by tuesday night. the surface low will 
then track well north of the lake wednesday and thursday.


loz062-231600-
lake ontario open waters from the niagara river to hamlin beach-
402 am est sun nov 23 2025

.today...southwest winds 15 to 25 knots becoming west to
30 knots. a chance of showers. waves 3 to 6 feet building to 6 to
9 feet. waves occasionally around 11 feet. 
.tonight...west winds to 30 knots becoming northwest and
diminishing to 15 to 20 knots. a chance of showers early. waves
5 to 8 feet subsiding to 3 to 6 feet. waves occasionally around
10 feet. 
.monday...west winds 5 to 15 knots becoming southwest. waves 1 to
3 feet. 
.monday night...south winds 5 to 10 knots. waves 2 feet or less. 
.tuesday...south winds 5 to 10 knots. showers likely. waves
1 foot or less. 
.wednesday...southwest winds 15 to 20 knots becoming west and
increasing to 35 knot gales. rain showers likely during the day,
then rain showers likely with a chance of snow showers wednesday
night. waves 2 to 4 feet building to 9 to 13 feet. waves
occasionally around 16 feet. 
.thursday...west gales to 35 knots. a chance of snow showers.
waves 10 to 14 feet subsiding to 8 to 11 feet. waves occasionally
around 18 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 will move from northern ontario to james 
bay, sending its cold front across the lake this afternoon. a 30.2 
inch high is then forecast to build across the ohio valley monday. 
on tuesday a 29.5 inch low to the north of lake superior will swing 
a cold front across the lake by tuesday night. the surface low will 
then track well north of the lake wednesday and thursday.


loz063-231600-
lake ontario open waters from hamlin beach to sodus bay-
402 am est sun nov 23 2025

.today...southwest winds 15 to 25 knots becoming west to
30 knots. a chance of rain showers this morning, then rain
showers likely early this afternoon. a chance of rain showers
late. waves 1 to 3 feet building to 7 to 10 feet. waves
occasionally around 13 feet. 
.tonight...west winds to 30 knots becoming northwest and
diminishing to 15 to 20 knots. a chance of showers early. waves
6 to 10 feet subsiding to 4 to 7 feet. waves occasionally around
13 feet. 
.monday...northwest winds 15 to 20 knots becoming southwest and
diminishing to 5 to 10 knots. waves 3 to 5 feet subsiding to 1 to
3 feet. 
.monday night...south winds 5 to 15 knots. waves 2 feet or less. 
.tuesday...south winds 10 to 15 knots. 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 rain and snow showers likely wednesday night. waves 1 to
3 feet building to 10 to 15 feet. waves occasionally around
19 feet. 
.thursday...west gales to 35 knots diminishing to 30 knots. snow
and rain showers likely during the day, then snow showers likely
thursday night. waves 11 to 16 feet subsiding to 10 to 14 feet.
waves occasionally around 20 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 will move from northern ontario to james 
bay, sending its cold front across the lake this afternoon. a 30.2 
inch high is then forecast to build across the ohio valley monday. 
on tuesday a 29.5 inch low to the north of lake superior will swing 
a cold front across the lake by tuesday night. the surface low will 
then track well north of the lake wednesday and thursday.


loz064-065-231600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est sun nov 23 2025

.today...south winds 15 to 25 knots becoming west to 30 knots.
rain showers. waves 1 to 3 feet building to 6 to 9 feet. waves
occasionally around 11 feet. 
.tonight...west winds 15 to 25 knots becoming northwest. rain
showers likely early, then a chance of rain showers late in the
evening. waves 6 to 10 feet subsiding to 4 to 7 feet. waves
occasionally around 13 feet. 
.monday...northwest winds 15 to 20 knots becoming southwest and
diminishing to 5 to 10 knots. waves 3 to 5 feet subsiding to 1 to
2 feet. 
.monday night...south winds 10 to 15 knots. waves 1 to 3 feet. 
.tuesday...south winds 10 to 15 knots. showers. waves 1 to
3 feet. 
.wednesday...south winds 15 to 20 knots becoming west and
increasing to 35 knot gales. rain showers during the day, then
rain showers with snow showers likely wednesday night. waves 1 to
3 feet building to 10 to 15 feet. waves occasionally around
19 feet. 
.thursday...west gales to 35 knots diminishing to 30 knots. rain
and snow showers likely during the day, then snow showers likely
thursday night. waves 11 to 16 feet. waves occasionally around
20 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est sun nov 23 2025


slz022-231600-
saint lawrence river from cape vincent to ogdensburg-
402 am est sun nov 23 2025

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

$$