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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1012 am edt sat apr 11 2026


slz022-024-112100-
saint lawrence river from cape vincent to saint regis
1012 am edt sat apr 11 2026

.this afternoon...northwest winds 5 to 10 knots. partly to 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
1010 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 this afternoon 
and tonight, then drift east to new england 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>065-112100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1010 am edt sat apr 11 2026

.this afternoon...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.

$$