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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
943 am edt tue sep 15 2026


slz022-024-152115-
saint lawrence river from cape vincent to saint regis
943 am edt tue sep 15 2026

.rest of today...south winds 5 to 10 knots. partly sunny late
this morning, 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. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
issued by national weather service cleveland oh
942 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.


loz062-152115-
lake ontario open waters from the niagara river to hamlin beach-
942 am edt tue sep 15 2026

.this afternoon...south winds 5 to 15 knots. waves 2 feet or less.
.tonight...south winds 5 to 15 knots becoming southwest. showers
likely after midnight. waves 2 feet or less. 
.wednesday...west winds around 10 knots becoming light and
variable. a chance of showers in the morning. waves 2 feet or
less. 
.wednesday night...northwest winds 10 knots or less becoming
northeast. waves 1 foot or less. 
.thursday...northeast winds 10 knots or less becoming northwest.
a chance of showers during the day. waves 2 feet or less. 
.friday...north winds 5 to 15 knots becoming east 15 to 20 knots.
waves 1 to 3 feet. 
.saturday...east winds 10 to 15 knots becoming southwest 15 to
20 knots. a chance of showers during the day, then showers with a
chance of thunderstorms saturday night. waves 2 to 4 feet
building to 3 to 5 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
issued by national weather service cleveland oh
942 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>065-152115-
lake ontario open waters from hamlin beach to the saint lawrence
river-
942 am edt tue sep 15 2026

.this afternoon...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.

$$