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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt fri sep 18 2026


slz022-024-190300-
saint lawrence river from cape vincent to saint regis
403 pm edt fri sep 18 2026

.tonight...north winds 5 to 10 knots becoming northeast. partly
to mostly cloudy. 
.saturday...northeast winds 10 knots or less. sunny.
.saturday night...northeast winds less than 10 knots. a chance of
showers overnight. 
.sunday...northeast winds 10 knots or less. a chance of showers. 
.sunday night...north winds 10 knots or less increasing to 10 to
15 knots. partly cloudy. 
.monday...north winds 5 to 15 knots becoming northeast. partly to
mostly cloudy. 
.tuesday...northeast winds 5 to 10 knots. partly cloudy. 
.wednesday...northeast winds 10 knots or less becoming east.
partly to mostly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt fri sep 18 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 30.4 inch high will build from southern quebec tonight 
to northern new england saturday, then off the new england coast 
saturday night. meanwhile, a weak 29.8 inch low is then forecast to 
move east across the eastern great lakes saturday night through 
sunday. a large 30.4 inch high will then slowly build east from 
northwest ontario sunday night to quebec by tuesday and wednesday, 
while gradually strengthening to 30.6 inches.


loz063>065-190300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt fri sep 18 2026

.tonight...north winds 10 to 15 knots becoming northeast 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday...northeast winds 5 to 15 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.saturday night...east winds 5 to 10 knots becoming southeast. a
chance of showers overnight. waves 2 feet or less. 
.sunday...southeast winds 10 to 15 knots becoming northeast.
showers likely. waves 1 to 3 feet. 
.sunday night...northeast winds 15 to 25 knots. a chance of
showers in the evening. waves 2 to 4 feet building to 3 to
5 feet. 
.monday...northeast winds 15 to 25 knots. waves 4 to 7 feet
building to 5 to 8 feet. waves occasionally around 10 feet. 
.tuesday...east winds 15 to 25 knots. waves 5 to 8 feet subsiding
to 3 to 6 feet. waves occasionally around 10 feet. 
.wednesday...east winds 15 to 20 knots becoming southeast. a
chance of showers. waves 3 to 6 feet subsiding to 2 to 4 feet. 

$$