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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
410 am edt sat apr 11 2026


slz022-024-111500-
saint lawrence river from cape vincent to saint regis
410 am edt sat apr 11 2026

.today...northwest winds 10 knots or less. mostly sunny. 
.tonight...west winds 5 to 10 knots becoming light and variable.
becoming mainly clear. 
.sunday...south winds 10 knots or less. rain showers likely in
the afternoon. 
.sunday night...south winds 5 to 15 knots becoming southwest
15 to 20 knots. showers.
.monday...southwest winds 15 to 20 knots becoming northwest and
diminishing to less than 10 knots. showers.
.tuesday...northeast winds 10 knots or less becoming south.
showers likely. 
.wednesday...southwest winds 5 to 10 knots. showers likely. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 am edt sat apr 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 30.5 inch high over the central great lakes this 
morning will build east over the lower great lakes today, then drift 
east to new england by sunday and off the coast sunday night. a 29.4 
inch low will then move northeastward from the upper midwest sunday 
to near james bay sunday night, while pushing an attendant warm 
front across the lake on sunday. this low will strengthen to 29.2 
inches while continuing to trek northeast into northern quebec 
monday, with a trailing cold front stalling near the lake monday 
through tuesday. a 29.5 inch surface low advancing through the upper 
great lakes wednesday will lift this frontal boundary northward into 
canada. this 29.5 inch low will continue northeast into central 
quebec on thursday while dragging an attendant cold front across the 
lake. a 30.2 inch high will then build over the lower great lakes 
thursday night and friday.


loz062-111500-
lake ontario open waters from the niagara river to hamlin beach-
409 am edt sat apr 11 2026

.today...northwest winds 5 to 15 knots becoming southwest. waves
1 to 3 feet. 
.tonight...southwest winds 10 knots or less becoming southeast.
waves 2 feet or less. 
.sunday...southeast winds 5 to 10 knots becoming east. a chance
of rain showers in the morning, then rain showers in the
afternoon. waves 2 feet or less. 
.sunday night...east winds 10 to 15 knots becoming southwest and
increasing to 15 to 25 knots. showers in the evening, then a
chance of showers overnight. waves 1 to 2 feet building to 3 to
6 feet. 
.monday...southwest winds 15 to 25 knots diminishing to 5 to
10 knots. showers during the day, then a chance of showers monday
night. waves 4 to 7 feet subsiding to 1 to 3 feet. waves
occasionally around 9 feet. 
.tuesday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. showers likely with a chance of thunderstorms. waves
1 to 3 feet. 
.wednesday...southwest winds 15 to 20 knots. showers likely with
a chance of thunderstorms. waves 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 am edt sat apr 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 30.5 inch high over the central great lakes this 
morning will build east over the lower great lakes today, then drift 
east to new england by sunday and off the coast sunday night. a 29.4 
inch low will then move northeastward from the upper midwest sunday 
to near james bay sunday night, while pushing an attendant warm 
front across the lake on sunday. this low will strengthen to 29.2 
inches while continuing to trek northeast into northern quebec 
monday, with a trailing cold front stalling near the lake monday 
through tuesday. a 29.5 inch surface low advancing through the upper 
great lakes wednesday will lift this frontal boundary northward into 
canada. this 29.5 inch low will continue northeast into central 
quebec on thursday while dragging an attendant cold front across the 
lake. a 30.2 inch high will then build over the lower great lakes 
thursday night and friday.


loz063>065-111500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
409 am edt sat apr 11 2026

.today...northwest winds 10 to 15 knots becoming west. waves 1 to
3 feet. 
.tonight...west winds 5 to 15 knots becoming south less than
10 knots. waves 2 feet or less. 
.sunday...south winds 5 to 15 knots becoming southeast. a chance
of rain showers in the morning, then rain showers likely in the
afternoon. waves 2 feet or less. 
.sunday night...southeast winds 15 to 25 knots becoming south.
showers likely. waves 2 to 4 feet building to 3 to 6 feet. 
.monday...southwest winds 15 to 25 knots becoming west and
diminishing to 5 to 10 knots. showers. waves 3 to 6 feet building
to 4 to 7 feet, then subsiding to 2 to 4 feet. waves occasionally
around 9 feet. 
.tuesday...southeast winds 5 to 15 knots becoming southwest.
showers likely with a chance of thunderstorms. waves 1 to 3 feet.
.wednesday...southwest winds 15 to 20 knots. showers likely.
waves 1 to 3 feet building to 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$