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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt sun sep 13 2026


slz022-024-140300-
saint lawrence river from cape vincent to saint regis
403 pm edt sun sep 13 2026

.tonight...west winds 10 knots or less becoming northwest. mostly
cloudy. 
.monday...northwest winds 5 to 10 knots. sunny.
.monday night...north winds less than 10 knots. mainly clear. 
.tuesday...southeast winds 10 knots or less becoming south 10 to
15 knots. partly sunny. 
.tuesday night...south winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers. 
.wednesday...southwest winds 5 to 10 knots becoming light and
variable. a chance of showers during the day. 
.thursday...northeast winds less than 10 knots becoming
northwest. a chance of showers. 
.friday...north winds less than 10 knots becoming east. a chance
of showers friday night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sun sep 13 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 29.2 inch low will move east across northern quebec 
tonight, with a trailing cold front moving away from the lake. a 
30.2 inch high will then build from the upper great lakes monday 
morning to the lower great lakes and new england monday night, then 
off the new england coast by tuesday. a 29.4 inch low is then 
forecast to move from northwest ontario province tuesday to northern 
quebec wednesday. a trailing cold front will cross the lower great 
lakes wednesday, then stall over the ohio valley and pennsylvania 
through thursday.


loz063>065-140300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt sun sep 13 2026

.tonight...west winds 15 to 25 knots becoming northwest. waves
1 to 3 feet building to 3 to 6 feet. 
.monday...north winds 15 to 20 knots becoming northwest and
diminishing to 5 to 10 knots. waves 3 to 5 feet subsiding to 1 to
3 feet. 
.monday night...northwest winds 5 to 10 knots becoming south.
waves 2 feet or less. 
.tuesday...south winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.tuesday night...south winds 15 to 25 knots. a chance of showers
overnight. waves 2 to 4 feet. 
.wednesday...southwest winds 5 to 15 knots becoming northeast
10 knots or less. a chance of showers. waves 1 to 3 feet
subsiding to 1 foot or less. 
.thursday...northeast winds 5 to 15 knots becoming north. a
chance of showers. waves 2 feet or less. 
.friday...north winds 5 to 15 knots becoming east. a chance of
showers friday night. waves 2 feet or less. 

$$