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open lake forecast for lake ontario
national weather service buffalo ny
issued by national weather service cleveland oh
346 am 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...a 30.3 inch high will depart the eastern great lakes 
today as a warm front lifts north of the lake. a weakening cold 
front will cross the lake tonight into wednesday and settle south 
of the lake. a weak 30.1 inch low will move across the front and 
south of the lake on thursday. a 30.4 inch high will build from 
the northwest starting on thursday night through saturday.


loz063>065-151530-
lake ontario open waters from hamlin beach to the saint lawrence
river-
346 am edt tue sep 15 2026

.today...south winds 15 to 20 knots. waves 1 to 3 feet building
to 3 to 5 feet. 
.tonight...south winds 15 to 25 knots. a chance of showers after
midnight. waves 3 to 6 feet. 
.wednesday...southwest winds 15 to 20 knots becoming west and
diminishing to less than 10 knots in the afternoon. a chance of
showers in the morning. waves 1 to 3 feet subsiding to 1 foot or
less. 
.wednesday night...west winds 10 knots or less becoming east.
waves 1 foot or less. 
.thursday...east winds 10 knots or less becoming northwest 10 to
15 knots. a chance of showers. waves 2 feet or less. 
.friday...north winds 10 to 15 knots becoming east. waves 1 to
3 feet. 
.saturday...east winds 10 to 15 knots becoming south and
increasing to 15 to 25 knots. a chance of showers during the day,
then showers saturday night. waves 1 to 3 feet building to 3 to
5 feet. 

winds and waves higher in and near thunderstorms.

$$

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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
337 am edt tue sep 15 2026


slz022-024-151515-
saint lawrence river from cape vincent to saint regis
345 am edt tue sep 15 2026

.today...southeast winds 5 to 10 knots becoming south. mostly
sunny early, then becoming mostly cloudy. 
.tonight...south winds 10 to 15 knots becoming southwest 15 to
20 knots. a chance of showers from late evening on. 
.wednesday...southwest winds 10 knots or less becoming west.
mostly cloudy. 
.wednesday night...light and variable winds. mostly cloudy. 
.thursday...northeast winds less than 10 knots. a chance of
showers during the day. 
.friday...north winds 10 knots or less becoming northeast. mainly
clear, then becoming partly cloudy. 
.saturday...northeast winds less than 10 knots becoming southeast
10 to 15 knots. a chance of showers during the day, then showers
likely saturday night. 

$$