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


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

.tonight...north winds 5 to 10 knots becoming light and variable.
clear.
.sunday...light and variable winds. sunny.
.sunday night...light and variable winds. mainly clear. 
.monday...southwest winds 10 knots or less. sunny.
.monday night...southwest winds 5 to 10 knots. partly cloudy. 
.tuesday...southwest winds 10 to 15 knots becoming west. partly
cloudy. 
.wednesday...west winds 5 to 15 knots becoming northwest less
than 10 knots. partly cloudy. 
.thursday...west winds 10 knots or less. mainly clear, then
becoming partly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sat jul 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 large 30.2 inch high will build south across the lower 
great lakes through this weekend, before sliding east into new 
england monday, then off the coast by tuesday. this will allow a 
warm front to sweep northeastward across the lake tuesday, followed 
by a cold front pushing south across the lake on wednesday.


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

.tonight...east winds less than 10 knots becoming northeast.
waves 1 foot or less. 
.sunday...northeast winds 10 knots or less becoming east. waves
1 foot or less. 
.sunday night...southeast winds less than 10 knots. waves 1 foot
or less. 
.monday...light and variable winds becoming southwest 5 to
10 knots. waves 1 foot or less. 
.monday night...southwest winds 10 to 15 knots. waves 1 to
3 feet. 
.tuesday...southwest winds 15 to 20 knots becoming west. waves
2 to 4 feet building to 3 to 6 feet. 
.wednesday...west winds 5 to 15 knots becoming northwest. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.thursday...west winds 10 knots or less becoming northwest. waves
2 feet or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sat jul 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 large 30.2 inch high will build south across the lower 
great lakes through this weekend, before sliding east into new 
england monday, then off the coast by tuesday. this will allow a 
warm front to sweep northeastward across the lake tuesday, followed 
by a cold front pushing south across the lake on wednesday.


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

.tonight...northeast winds 5 to 15 knots diminishing to less than
10 knots. waves 2 feet or less. 
.sunday...east winds 10 knots or less becoming north. waves
1 foot or less. 
.sunday night...north winds less than 10 knots. waves 1 foot or
less. 
.monday...southwest winds 5 to 10 knots becoming west. waves
1 foot or less. 
.monday night...southwest winds 5 to 15 knots. waves 1 to 3 feet.
.tuesday...southwest winds 15 to 25 knots becoming west. waves
3 to 6 feet building to 4 to 7 feet. waves occasionally around
9 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.thursday...west winds 5 to 15 knots becoming northwest. waves
2 feet or less. 

$$