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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm est thu nov 20 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 30.3 inch high over the lower great lakes will slide 
out across new england through tonight. a 29.5 inch surface low near 
james bay will swing a cold front east across tomorrow afternoon and 
evening, with a 30.1 inch high building over the ohio valley and 
lower great lakes saturday. a 29.5 inch low will then move from 
northern ontario to james bay sunday, while pushing 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.


loz064-065-211000-
lake ontario open waters from sodus bay to the saint lawrence
river-
1002 pm est thu nov 20 2025

.overnight...south winds 10 to 15 knots becoming southwest
15 to 20 knots. waves 2 feet or less building to 2 to 4 feet. 
.friday...southwest winds 15 to 25 knots becoming west. a chance
of showers late in the morning. waves 3 to 6 feet building to
4 to 7 feet. waves occasionally around 9 feet. 
.friday night...west winds 15 to 20 knots becoming northwest
10 to 15 knots. waves 3 to 6 feet subsiding to 2 to 4 feet. 
.saturday...north winds 5 to 15 knots becoming northwest. waves
1 to 3 feet. 
.saturday night...northwest winds 5 to 10 knots becoming west.
waves 2 feet or less. 
.sunday...southwest winds 10 to 15 knots becoming northwest 15 to
20 knots. a chance of rain showers. waves 1 to 3 feet building to
3 to 5 feet. 
.monday...northwest winds 15 to 20 knots becoming southeast.
waves 3 to 5 feet subsiding to 1 to 3 feet. 
.tuesday...southeast winds 15 to 25 knots becoming south. rain
likely during the day, then showers tuesday night. waves 2 to
4 feet building to 3 to 6 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm est thu nov 20 2025


slz022-211000-
saint lawrence river from cape vincent to ogdensburg-
1002 pm est thu nov 20 2025

.overnight...east winds 10 knots or less becoming south.
mostly cloudy. 
.friday...south winds 5 to 15 knots becoming southwest. rain
showers likely late in the morning. 
.friday night...west winds 10 knots or less becoming northwest.
mostly cloudy. 
.saturday...northwest winds less than 10 knots. mostly sunny. 
.saturday night...light and variable winds. partly cloudy in the
evening, then becoming mostly cloudy. 
.sunday...southwest winds 5 to 10 knots becoming west. a chance
of rain and snow showers during the day, then a chance of rain
showers sunday night. 
.monday...west winds 10 knots or less becoming south. mostly
cloudy. 
.tuesday...southeast winds 5 to 15 knots becoming south. rain
likely during the day, then rain showers tuesday night. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm est thu nov 20 2025


slz024-211000-
saint lawrence river from ogdensburg to saint regis-
1002 pm est thu nov 20 2025

.overnight...light and variable winds. mostly cloudy. 
.friday...south winds 5 to 10 knots becoming southwest. a chance
of rain showers early, then rain showers likely late in the
morning. a chance of rain showers early in the afternoon. 
.friday night...west winds 10 knots or less. mostly cloudy. 
.saturday...northwest winds less than 10 knots. mostly sunny. 
.saturday night...west winds less than 10 knots. partly cloudy in
the evening, then becoming mostly cloudy. 
.sunday...southwest winds 10 knots or less becoming west. a
chance of snow and rain showers. 
.monday...west winds 10 knots or less becoming south. mostly
cloudy. 
.tuesday...southeast winds 5 to 15 knots becoming south. rain
likely during the day, then rain showers tuesday night. 

$$