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


slz022-024-111500-
saint lawrence river from cape vincent to saint regis
403 am edt mon may 11 2026

.today...west winds 10 knots or less. a chance of rain showers
this afternoon. 
.tonight...west winds less than 10 knots. becoming mainly clear. 
.tuesday...light and variable winds becoming west 5 to 10 knots.
sunny.
.tuesday night...southwest winds 5 to 10 knots becoming
southeast. a chance of showers overnight. 
.wednesday...southeast winds 5 to 15 knots becoming south.
showers.
.thursday...southwest winds 10 knots or less becoming northwest.
showers likely. 
.friday...northwest winds 10 knots or less becoming southwest.
mostly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 30.4 inch high will build from the upper great 
lakes today to the lower great lakes by tuesday before drifting off 
the east coast tuesday night. a 29.7 inch low will then move from 
the central great lakes tuesday night to the lower great lakes 
wednesday before drifting to the eastern seaboard thursday. this low 
will remain over the gulf of maine through friday before moving into 
the canadian maritimes saturday.


loz062-111500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt mon may 11 2026

.today...northwest winds 5 to 10 knots becoming west. a chance of
showers early. waves 1 foot or less. 
.tonight...west winds 5 to 10 knots becoming northwest. waves
1 foot or less. 
.tuesday...north winds 10 knots or less becoming northeast. waves
1 foot or less. 
.tuesday night...southeast winds 5 to 15 knots. showers. waves
1 to 3 feet. 
.wednesday...south winds 10 to 15 knots becoming west. showers.
waves 1 to 3 feet. 
.thursday...northwest winds 5 to 10 knots. a chance of showers
during the day. waves 1 to 2 feet. 
.friday...west winds 5 to 10 knots becoming southwest. waves
1 foot or less. 

$$

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glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 30.4 inch high will build from the upper great 
lakes today to the lower great lakes by tuesday before drifting off 
the east coast tuesday night. a 29.7 inch low will then move from 
the central great lakes tuesday night to the lower great lakes 
wednesday before drifting to the eastern seaboard thursday. this low 
will remain over the gulf of maine through friday before moving into 
the canadian maritimes saturday.


loz063>065-111500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt mon may 11 2026

.today...west winds 5 to 15 knots. a chance of showers this
morning. waves 2 feet or less. 
.tonight...west winds 5 to 10 knots becoming north. waves 2 feet
or less. 
.tuesday...north winds 10 knots or less. waves 1 foot or less. 
.tuesday night...east winds 10 knots or less becoming southeast
and increasing to 15 to 20 knots overnight. showers overnight.
waves 1 foot or less building to 1 to 3 feet. 
.wednesday...southeast winds 15 to 25 knots becoming southwest
and diminishing to 5 to 15 knots. showers. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of showers during the day. waves 2 feet or less. 
.friday...northwest winds 5 to 10 knots becoming southwest. waves
1 foot or less. 

$$