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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt thu sep 17 2026


slz022-024-180900-
saint lawrence river from cape vincent to saint regis
1003 pm edt thu sep 17 2026

.overnight...light and variable winds. partly cloudy. 
.friday...northwest winds 5 to 10 knots becoming north. sunny.
.friday night...north winds 5 to 10 knots becoming northeast.
partly cloudy. 
.saturday...northeast winds less than 10 knots. sunny.
.saturday night...light and variable winds. partly to mostly
cloudy. 
.sunday...northeast winds 10 knots or less becoming north. a
chance of showers during the day. 
.monday...north winds 5 to 10 knots becoming northeast. partly to
mostly cloudy. 
.tuesday...northeast winds 5 to 10 knots. becoming mainly clear. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt thu sep 17 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 front will move southeast and away from the lake 
overnight. a 30.3 inch high will build from northwest ontario friday 
to southern quebec saturday, then off the new england coast saturday 
night. a weak 29.9 inch low is then forecast to move east across 
ohio and pennsylvania late saturday night through sunday. another 
30.3 inch high will then build from northwest ontario sunday night 
to quebec by tuesday and wednesday while gradually strengthening to 
30.6 inches.


loz063>065-180900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt thu sep 17 2026

.overnight...northwest winds 5 to 15 knots becoming north.
waves 2 feet or less. 
.friday...north winds 10 to 15 knots. waves 1 to 3 feet. 
.friday night...north winds 10 to 15 knots becoming northeast.
waves 1 to 3 feet. 
.saturday...east winds 5 to 15 knots. waves 1 to 3 feet. 
.saturday night...east winds 5 to 10 knots. a chance of showers
overnight. waves 2 feet or less. 
.sunday...east winds 10 to 15 knots becoming northeast and
increasing to 15 to 25 knots. a chance of showers during the day.
waves 1 to 3 feet building to 3 to 6 feet. 
.monday...northeast winds 15 to 25 knots. waves 4 to 7 feet.
waves occasionally around 9 feet. 
.tuesday...northeast winds 15 to 25 knots becoming east. a chance
of showers. waves 4 to 7 feet subsiding to 3 to 6 feet. waves
occasionally around 9 feet. 

$$