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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt fri sep 11 2026

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 high pressure ridge averaging 30.0 inches exits 
toward new england through saturday. a warm front will sweep 
northeastward across the lake saturday evening before a cold front 
sweeps eastward across the lake on sunday. behind the cold front, a 
ridge averaging 30.2 inches will slide eastward across the lower 
great lakes through monday. the ridge should exit toward new england 
on tuesday and allow a warm front to sweep northeastward across the 
lake. on wednesday, a cold front should sweep eastward across the 
lake and be followed by a ridge averaging 30.1 inches and building 
from the upper midwest.


loz062-120300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt fri sep 11 2026

.tonight...south winds 10 knots or less becoming southeast. waves
1 foot or less. 
.saturday...south winds 5 to 10 knots becoming east. waves 1 foot
or less. 
.saturday night...southeast winds 5 to 15 knots becoming
southwest. waves 2 feet or less. 
.sunday...west winds 5 to 15 knots. waves 1 to 2 feet. 
.sunday night...northwest winds 15 to 20 knots. a chance of
showers. waves 1 to 3 feet. 
.monday...north winds 15 to 20 knots becoming southeast 5 to
15 knots. waves 1 to 3 feet. 
.tuesday...south winds 5 to 15 knots becoming southwest. showers
likely tuesday night. waves 1 to 3 feet building to 2 to 4 feet,
then subsiding to 1 to 3 feet. 
.wednesday...southwest winds 10 knots or less becoming north. a
chance of showers. waves 2 feet or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt fri sep 11 2026

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 high pressure ridge averaging 30.0 inches exits 
toward new england through saturday. a warm front will sweep 
northeastward across the lake saturday evening before a cold front 
sweeps eastward across the lake on sunday. behind the cold front, a 
ridge averaging 30.2 inches will slide eastward across the lower 
great lakes through monday. the ridge should exit toward new england 
on tuesday and allow a warm front to sweep northeastward across the 
lake. on wednesday, a cold front should sweep eastward across the 
lake and be followed by a ridge averaging 30.1 inches and building 
from the upper midwest.


loz063>065-120300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt fri sep 11 2026

.tonight...southwest winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...southeast winds 5 to 15 knots. waves 1 to 3 feet. 
.saturday night...south winds 15 to 20 knots becoming southwest.
a chance of showers. waves 2 to 4 feet. 
.sunday...southwest winds 10 to 15 knots becoming west. a chance
of showers in the afternoon. waves 1 to 3 feet. 
.sunday night...west winds 15 to 20 knots becoming northwest. a
chance of showers. waves 2 to 4 feet. 
.monday...northwest winds 15 to 20 knots becoming southeast 5 to
15 knots. waves 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots. a chance of showers
tuesday night. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.wednesday...southwest winds 15 to 20 knots becoming north and
diminishing to 10 knots or less. a chance of showers. waves 1 to
3 feet subsiding to 1 foot or less. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt fri sep 11 2026


slz022-024-120300-
saint lawrence river from cape vincent to saint regis
403 pm edt fri sep 11 2026

.tonight...southwest winds less than 10 knots becoming south.
mainly clear. 
.saturday...south winds 10 knots or less becoming southwest.
sunny.
.saturday night...south winds 5 to 15 knots. a chance of showers.
.sunday...southwest winds 5 to 10 knots becoming west. a chance
of showers. 
.sunday night...west winds 5 to 10 knots. showers likely. 
.monday...northwest winds 5 to 10 knots becoming light and
variable. a chance of showers during the day. 
.tuesday...south winds 5 to 15 knots. a chance of showers tuesday
night. 
.wednesday...southwest winds 10 knots or less becoming north. a
chance of showers. 

$$