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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. 

$$

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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


slz024-231600-
saint lawrence river from ogdensburg to saint regis-
402 am est sun nov 23 2025

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

$$