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


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

.tonight...west winds 5 to 10 knots becoming light and variable.
becoming mainly clear. 
.sunday...south winds 10 knots or less. a chance of rain showers
early in the afternoon. rain showers likely late. 
.sunday night...south winds 5 to 10 knots becoming southwest and
increasing to 15 to 20 knots. showers.
.monday...southwest winds 15 to 20 knots. showers.
.monday night...southwest winds 5 to 15 knots diminishing to less
than 10 knots. showers in the evening, then a chance of showers
overnight. 
.tuesday...southeast winds 5 to 10 knots becoming south. showers
with a chance of thunderstorms. 
.wednesday...southwest winds 5 to 10 knots. showers likely. 
.thursday...southwest winds 10 knots or less becoming west. a
chance of showers. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
404 pm 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 area of high pressure over the lake this 
evening, will slip towards new england later tonight and 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.


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

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

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
404 pm 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 area of high pressure over the lake this 
evening, will slip towards new england later tonight and 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>065-120300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
404 pm edt sat apr 11 2026

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

winds and waves higher in and near thunderstorms.

$$