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


slz022-024-121500-
saint lawrence river from cape vincent to saint regis
404 am edt sun apr 12 2026

.today...south winds 10 knots or less. a chance of rain showers
early this afternoon. rain showers likely late. 
.tonight...southeast winds 5 to 15 knots becoming southwest 15 to
20 knots. showers.
.monday...southwest winds 15 to 20 knots diminishing to 10 to
15 knots. showers.
.monday night...southwest winds 5 to 15 knots diminishing to less
than 10 knots. showers likely in the evening, then a chance of
showers overnight. 
.tuesday...southeast winds 5 to 10 knots becoming southwest.
showers with a chance of thunderstorms. 
.wednesday...southwest winds 10 knots or less becoming south. a
chance of showers during the day, then showers likely wednesday
night. 
.thursday...south winds 5 to 10 knots becoming southwest. showers
likely. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am 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 drift east 
into new england today, before sliding off the coast tonight. a 29.4 
inch low over the upper midwest today, will move quickly 
northeastward to near james bay tonight, while pushing an attendant 
warm front across the lake this afternoon. 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.


loz062-121500-
lake ontario open waters from the niagara river to hamlin beach-
403 am edt sun apr 12 2026

.today...southeast winds 5 to 15 knots becoming east. rain
showers this afternoon. waves 2 feet or less. 
.tonight...east winds 10 to 15 knots becoming southwest and
increasing to 15 to 25 knots. a chance of showers in the evening.
a chance of showers late. waves 1 to 3 feet building to 3 to
5 feet. 
.monday...southwest winds 15 to 25 knots. showers. waves 3 to
6 feet. 
.monday night...southwest winds 15 to 20 knots diminishing to
10 to 15 knots. showers likely overnight. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. showers likely with a chance of thunderstorms. waves
1 to 3 feet building to 3 to 5 feet, then subsiding to 1 to
3 feet. 
.wednesday...southwest winds 10 to 15 knots. showers likely with
a chance of thunderstorms during the day, then showers likely
wednesday night. waves 1 to 2 feet. 
.thursday...south winds 15 to 20 knots becoming west 10 to
15 knots. showers likely. waves 1 to 3 feet building to 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
403 am 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 drift east 
into new england today, before sliding off the coast tonight. a 29.4 
inch low over the upper midwest today, will move quickly 
northeastward to near james bay tonight, while pushing an attendant 
warm front across the lake this afternoon. 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>065-121500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt sun apr 12 2026

.today...southeast winds 5 to 15 knots. a chance of rain showers
early this afternoon. rain showers late. waves 2 feet or less. 
.tonight...southeast winds 15 to 25 knots becoming south. showers
likely early, then a chance of showers late in the evening. a
chance of showers late. waves 1 to 3 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. 
.monday night...southwest winds 15 to 20 knots becoming south
5 to 15 knots. a chance of showers. waves 3 to 5 feet subsiding
to 1 to 3 feet. 
.tuesday...south winds 10 to 15 knots becoming southwest. showers
with a chance of thunderstorms. waves 1 to 2 feet building to
2 to 4 feet, then subsiding to 1 to 3 feet. 
.wednesday...southwest winds 5 to 15 knots. showers likely. waves
2 feet or less. 
.thursday...south winds 15 to 20 knots becoming west. showers
likely. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$