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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
357 pm edt mon sep 14 2026


slz022-024-150315-
saint lawrence river from cape vincent to saint regis
357 pm edt mon sep 14 2026

.tonight...northwest winds less than 10 knots. mainly clear
through the early overnight, then becoming partly cloudy. 
.tuesday...south winds 5 to 15 knots. partly sunny. 
.tuesday night...south winds 10 to 15 knots becoming southwest.
mostly cloudy. 
.wednesday...southwest winds 10 knots or less becoming west.
partly sunny. 
.wednesday night...light and variable winds. mostly cloudy. 
.thursday...northeast winds less than 10 knots becoming
northwest. a chance of showers. 
.friday...north winds less than 10 knots becoming east. partly
cloudy. 
.saturday...southeast winds 10 knots or less becoming northeast.
a chance of showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
issued by national weather service cleveland oh
356 pm edt mon sep 14 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 centered over the eastern
great lakes will exit east across new england through tuesday. low
pressure 29.50 inches tracks from northern ontario province into
northern quebec province tuesday into wednesday. a warm front will
lift across lake ontario late tuesday ahead of the low, with a
cold front crossing behind the low on wednesday. the front will
become stationary across the region through thursday before
pushing well south as a cold front on friday as high pressure
30.20 inches builds into the eastern great lakes. 


loz063>065-150315-
lake ontario open waters from hamlin beach to the saint lawrence
river-
356 pm edt mon sep 14 2026

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

$$