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open lake forecast for lake ontario
national weather service buffalo ny
402 am est sat nov 22 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 30.1 inch high will build over the ohio valley and 
lower great lakes today. a 29.5 inch low will move from northern 
ontario to james bay sunday, sending its cold front across the lake 
through the afternoon hours. 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 through wednesday.


loz064-065-221600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est sat nov 22 2025

.today...northwest winds 10 to 15 knots. waves 1 to 3 feet. 
.tonight...northwest winds 5 to 15 knots becoming southwest.
waves 2 feet or less. 
.sunday...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. 
.sunday night...west winds to 30 knots becoming northwest 15 to
25 knots. rain showers in the evening, then a chance of rain
showers overnight. waves 8 to 11 feet subsiding to 4 to 7 feet.
waves occasionally around 14 feet. 
.monday...northwest winds 15 to 20 knots becoming south 5 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.tuesday...southeast winds 15 to 20 knots becoming south.
showers. waves 1 to 3 feet building to 2 to 4 feet. 
.wednesday...southwest winds 15 to 20 knots becoming west and
increasing to 30 knots. rain showers. waves 3 to 5 feet building
to 8 to 12 feet. waves occasionally around 15 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est sat nov 22 2025


slz022-221600-
saint lawrence river from cape vincent to ogdensburg-
402 am est sat nov 22 2025

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

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est sat nov 22 2025


slz024-221600-
saint lawrence river from ogdensburg to saint regis-
402 am est sat nov 22 2025

.today...west winds 5 to 10 knots becoming northwest. partly
sunny. 
.tonight...west winds less than 10 knots. partly cloudy in the
evening, then becoming mostly cloudy. 
.sunday...south winds 10 knots or less. snow showers in the
morning, then snow and rain showers in the afternoon. 
.sunday night...southwest winds 10 knots or less becoming west.
snow and rain showers in the evening, then snow showers likely
overnight. 
.monday...west winds 10 knots or less becoming south. mostly
cloudy. 
.tuesday...southeast winds 10 knots or less becoming south. rain
showers. 
.wednesday...south winds 5 to 15 knots becoming southwest. rain
showers. 

$$