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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est fri nov 21 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 29.2 inch surface low near james bay will swing a cold 
front across the lake this 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, 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.


loz064-065-220400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est fri nov 21 2025

.tonight...west winds 15 to 20 knots becoming northwest 10 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.saturday...northwest winds 10 to 15 knots. waves 1 to 3 feet. 
.saturday night...northwest winds 5 to 10 knots becoming
southwest. waves 2 feet or less. 
.sunday...southwest winds 15 to 25 knots becoming west. rain
likely. waves 1 to 3 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.sunday night...west winds 15 to 25 knots becoming northwest.
rain likely in the evening, then a chance of rain overnight.
waves 5 to 8 feet subsiding to 3 to 5 feet. waves occasionally
around 10 feet. 
.monday...northwest winds 5 to 15 knots becoming south. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...southeast winds 15 to 20 knots becoming south. rain.
waves 1 to 3 feet building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.wednesday...southwest winds 15 to 20 knots becoming west and
increasing to 30 knots. rain showers likely during the day, then
rain and snow showers likely wednesday night. waves 3 to 5 feet
building to 9 to 13 feet. waves occasionally around 16 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est fri nov 21 2025


slz022-220400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est fri nov 21 2025

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

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est fri nov 21 2025


slz024-220400-
saint lawrence river from ogdensburg to saint regis-
402 pm est fri nov 21 2025

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

$$