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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm edt thu sep 10 2026


slz022-024-110900-
saint lawrence river from cape vincent to saint regis
1002 pm edt thu sep 10 2026

.rest of tonight...northwest winds 5 to 10 knots becoming light
and variable. partly cloudy late this evening, then becoming
mainly clear. 
.friday...light and variable winds. sunny.
.friday night...southwest winds less than 10 knots. mainly clear.
.saturday...south winds 10 knots or less becoming southwest.
mostly sunny. 
.saturday night...south winds 5 to 15 knots. a chance of showers.
.sunday...southwest winds 5 to 10 knots becoming northwest.
showers likely with a chance of thunderstorms during the day,
then a chance of showers and thunderstorms sunday night. 
.monday...north winds 10 knots or less becoming southeast. mainly
clear, then becoming partly cloudy. 
.tuesday...south winds 10 to 15 knots becoming southwest. a
chance of showers during the day, then showers likely tuesday
night. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt thu sep 10 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 builds from 
the western great lakes through friday, before exiting toward the 
new england coast on saturday. a warm front will sweep northeastward 
across lake ontario saturday evening through saturday night before a 
cold front sweeps eastward across lake ontario on sunday. behind the 
cold front, a 30.1 inch ridge will slide eastward across the lake 
through monday. on tuesday, the ridge should exit toward new england 
and allow a warm front to sweep northeastward across lake ontario.


loz062-110900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt thu sep 10 2026

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

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt thu sep 10 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 builds from 
the western great lakes through friday, before exiting toward the 
new england coast on saturday. a warm front will sweep northeastward 
across lake ontario saturday evening through saturday night before a 
cold front sweeps eastward across lake ontario on sunday. behind the 
cold front, a 30.1 inch ridge will slide eastward across the lake 
through monday. on tuesday, the ridge should exit toward new england 
and allow a warm front to sweep northeastward across lake ontario.


loz063>065-110900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt thu sep 10 2026

.overnight...northwest winds 15 to 20 knots becoming north
10 to 15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday...north winds 10 knots or less becoming west. waves
2 feet or less. 
.friday night...west winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...southeast winds 5 to 15 knots. waves 2 feet or less. 
.saturday night...southeast winds 10 to 15 knots becoming
southwest 15 to 20 knots. a chance of showers. waves 1 to 3 feet.
.sunday...southwest winds 10 to 15 knots becoming northwest 15 to
20 knots. a chance of showers. waves 1 to 3 feet. 
.monday...north winds 5 to 15 knots becoming southeast 15 to
20 knots. waves 1 to 3 feet. 
.tuesday...south winds 15 to 25 knots becoming southwest. a
chance of showers during the day, then showers likely tuesday
night. waves 3 to 5 feet subsiding to 2 to 4 feet. 

$$