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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1011 pm edt sun apr 12 2026


slz022-024-130900-
saint lawrence river from cape vincent to saint regis
1011 pm edt sun apr 12 2026

.rest of tonight...south winds 10 to 15 knots becoming southwest
15 to 20 knots. showers late this evening, then a chance of
showers after midnight. 
.monday...southwest winds 15 to 20 knots diminishing to 10 to
15 knots. showers through early afternoon, then a chance of
showers late. 
.monday night...southwest winds 10 to 15 knots becoming light and
variable. a chance of showers. 
.tuesday...northeast winds 10 knots or less becoming southwest.
showers likely in the morning, then showers with a chance of
thunderstorms in the afternoon. 
.tuesday night...southwest winds 5 to 10 knots. showers with a
chance of thunderstorms in the evening, then showers likely
overnight. 
.wednesday...southwest winds 5 to 10 knots becoming south.
showers likely. 
.thursday...southeast winds 5 to 10 knots becoming southwest.
showers likely. 
.friday...southwest winds 10 knots or less becoming south. mostly
cloudy, then becoming partly cloudy. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1010 pm edt sun apr 12 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 will slide off the 
east coast tonight. a 29.3 inch low over the upper midwest this 
evening, will move quickly northeastward to near james bay tonight. 
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 southern 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 on friday.


loz063>065-130900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1010 pm edt sun apr 12 2026

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

winds and waves higher in and near thunderstorms.

$$