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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
issued by national weather service cleveland oh
347 pm edt tue sep 15 2026


slz022-024-160315-
saint lawrence river from cape vincent to saint regis
348 pm edt tue sep 15 2026

.tonight...south winds 10 to 15 knots becoming southwest. a
chance of showers. 
.wednesday...southwest winds 10 knots or less becoming northwest.
mostly cloudy. 
.wednesday night...light and variable winds. mostly cloudy. 
.thursday...northeast winds less than 10 knots. a chance of
showers. 
.thursday night...light and variable winds. partly cloudy. 
.friday...northwest winds 10 knots or less becoming northeast.
mainly clear, then becoming partly cloudy. 
.saturday...northeast winds less than 10 knots. a chance of
showers during the day, then showers likely saturday night. 
.sunday...northeast winds 5 to 10 knots. showers likely during
the day, then a chance of showers sunday night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
issued by national weather service cleveland oh
347 pm edt tue sep 15 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...
high pressure 30.30 inches continues exiting to the east tonight.
a cold front crosses the lake early wednesday, before stalling
across southern new york through thursday. high pressure 30.20
inches builds into new england friday and through the weekend as
an active frontal boundary establishes to the southwest.


loz063>065-160315-
lake ontario open waters from hamlin beach to the saint lawrence
river-
347 pm edt tue sep 15 2026

.tonight...south winds 15 to 25 knots. a chance of showers. waves
3 to 6 feet. 
.wednesday...southwest winds 5 to 15 knots becoming west less
than 10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.wednesday night...northwest winds 10 knots or less becoming
east. waves 1 foot or less. 
.thursday...east winds less than 10 knots becoming north. a
chance of showers. waves 1 foot or less. 
.thursday night...northwest winds 10 knots or less increasing to
10 to 15 knots. waves 2 feet or less. 
.friday...north winds 10 to 15 knots becoming east. waves 1 to
3 feet. 
.saturday...east winds 5 to 15 knots. a chance of showers during
the day, then showers likely saturday night. waves 1 to 3 feet
building to 3 to 5 feet. 
.sunday...northeast winds 15 to 20 knots. showers likely during
the day, then a chance of showers sunday night. waves 3 to 5 feet
subsiding to 2 to 4 feet. 

$$