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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt wed sep 16 2026


slz022-024-170300-
saint lawrence river from cape vincent to saint regis
403 pm edt wed sep 16 2026

.tonight...north winds less than 10 knots becoming northeast.
mostly cloudy. 
.thursday...northeast winds 10 knots or less becoming north.
mostly cloudy early, then becoming mostly sunny. 
.thursday night...north winds less than 10 knots. partly cloudy. 
.friday...northwest winds 5 to 10 knots becoming north. sunny.
.friday night...north winds 10 knots or less becoming northeast.
partly cloudy. 
.saturday...northeast winds less than 10 knots. showers likely
saturday night. 
.sunday...northeast winds 5 to 10 knots becoming north. showers
likely during the day. 
.monday...northeast winds 5 to 10 knots. mostly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt wed sep 16 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 weak cold front will settle south of the lake this 
evening, then stall just south of the lake thursday. a 30.4 inch 
high will then build from northwest ontario province thursday night 
to southern quebec by saturday morning before moving off the new 
england coast by sunday while weakening to 30.2 inches. another 30.4 
inch high will then build from northwest ontario province sunday to 
western quebec monday. meanwhile, a 29.8 inch low will move into the 
lower ohio valley by monday.


loz063>065-170300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt wed sep 16 2026

.tonight...west winds 5 to 15 knots becoming northeast. waves
2 feet or less. 
.thursday...northeast winds 5 to 10 knots becoming north. a
chance of showers in the morning. waves 2 feet or less. 
.thursday night...northwest winds 5 to 15 knots. waves 2 feet or
less. 
.friday...northwest winds 10 to 15 knots becoming north. waves
1 to 3 feet. 
.friday night...north winds 10 to 15 knots becoming east. waves
1 to 3 feet. 
.saturday...east winds 5 to 15 knots becoming southeast. showers
likely saturday night. waves 1 to 3 feet. 
.sunday...northeast winds 15 to 20 knots. showers likely during
the day. waves 2 to 4 feet building to 3 to 5 feet. 
.monday...northeast winds 15 to 25 knots becoming east. a chance
of showers monday night. waves 3 to 5 feet. 

$$