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open lake forecast for lake ontario
national weather service buffalo ny
402 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 the lake friday, 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 warm front across the lake 
saturday night, followed by its trailing cold front sunday. a 30.2 
inch high is forecast to build across the ohio valley monday.


loz063-210400-
lake ontario open waters from hamlin beach to sodus bay-
402 pm est thu nov 20 2025

.tonight...southeast winds 5 to 15 knots becoming southwest 15 to
20 knots. waves 1 to 3 feet. 
.friday...southwest winds 15 to 20 knots becoming west. waves
2 to 4 feet building to 3 to 6 feet. 
.friday night...west winds 15 to 20 knots becoming northwest
10 to 15 knots. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.saturday...northwest winds 10 to 15 knots. waves 1 to 3 feet. 
.saturday night...northwest winds 5 to 10 knots becoming west.
waves 1 to 2 feet. 
.sunday...southwest winds 10 to 15 knots becoming west 15 to
20 knots. 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 20 knots becoming south. rain
likely during the day, then showers likely tuesday night. waves
2 to 4 feet building to 3 to 5 feet, then subsiding to 2 to
4 feet. 

$$

fzus61 kbuf 202102
glflo 
expires:202511210400;;214117

open lake forecast for lake ontario
national weather service buffalo ny
402 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 the lake friday, 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 warm front across the lake 
saturday night, followed by its trailing cold front sunday. a 30.2 
inch high is forecast to build across the ohio valley monday.


loz064-065-210400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est thu nov 20 2025

.tonight...southeast winds 5 to 15 knots becoming southwest 15 to
20 knots. waves 2 feet or less building to 2 to 4 feet. 
.friday...south 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
402 pm est thu nov 20 2025


slz022-210400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est thu nov 20 2025

.tonight...east winds 10 knots or less becoming south. mainly
clear early, then becoming mostly cloudy. 
.friday...south winds 5 to 10 knots becoming southwest. rain
showers likely late in the morning. 
.friday night...west winds 10 knots or less becoming northwest.
partly to 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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glfsl 
expires:202511210400;;214114

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


slz024-210400-
saint lawrence river from ogdensburg to saint regis-
402 pm est thu nov 20 2025

.tonight...light and variable winds. partly cloudy early, then
becoming 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. partly 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. 

$$