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


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

.tonight...west winds 5 to 10 knots becoming light and variable.
scattered rain showers early. 
.tuesday...light and variable winds becoming west 5 to 10 knots.
sunny.
.tuesday night...southwest winds 10 knots or less becoming
southeast. showers likely overnight. 
.wednesday...southeast winds 5 to 15 knots. showers.
.wednesday night...south winds 10 knots or less. showers.
.thursday...southwest winds 10 knots or less becoming north.
showers likely during the day, then a chance of showers thursday
night. 
.friday...north winds 10 knots or less becoming southwest. mostly
cloudy. 
.saturday...southwest winds 5 to 10 knots. partly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt mon may 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 30.3 inch high will settle from lake superior to new 
york state by tuesday morning...then off the east coast by tuesday 
evening. a 29.7 inch low over the central great lakes tuesday night 
will then move to the ottawa valley wednesday...before drifting to 
the eastern seaboard thursday...the gulf of maine friday...and the 
canadian maritimes saturday.


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

.tonight...west winds 5 to 10 knots becoming north. waves 1 foot
or less. 
.tuesday...light and variable winds becoming east 5 to 10 knots.
waves 1 foot or less. 
.tuesday night...east winds 5 to 10 knots becoming southeast and
increasing to 15 to 20 knots. showers. waves 2 feet or less
building to 2 to 3 feet. 
.wednesday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. showers. waves 1 to 3 feet. 
.wednesday night...west winds 10 to 15 knots. showers likely in
the evening, then a chance of showers overnight. waves 1 to
3 feet. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of showers during the day. waves 1 to 2 feet. 
.friday...northwest winds 5 to 10 knots becoming southwest. waves
1 to 2 feet. 
.saturday...southwest winds 10 to 15 knots becoming west. a
chance of showers. waves 1 to 3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt mon may 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 30.3 inch high will settle from lake superior to new 
york state by tuesday morning...then off the east coast by tuesday 
evening. a 29.7 inch low over the central great lakes tuesday night 
will then move to the ottawa valley wednesday...before drifting to 
the eastern seaboard thursday...the gulf of maine friday...and the 
canadian maritimes saturday.


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

.tonight...west winds 5 to 10 knots becoming north. waves 2 feet
or less. 
.tuesday...north winds 10 knots or less becoming northeast. waves
1 foot or less. 
.tuesday night...east winds 5 to 15 knots becoming southeast
15 to 20 knots. a chance of showers in the evening, then showers
overnight. waves 1 to 3 feet. 
.wednesday...southeast winds 15 to 25 knots becoming southwest
and diminishing to 10 to 15 knots. showers. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming west.
showers in the evening, then a chance of showers overnight. waves
1 to 2 feet. 
.thursday...west winds 5 to 10 knots becoming northwest. waves
1 to 2 feet. 
.friday...northwest winds 5 to 15 knots becoming west. waves 1 to
2 feet. 
.saturday...southwest winds 5 to 15 knots becoming west. waves
1 to 3 feet. 

$$