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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am edt sun aug 23 2026


slz022-024-232100-
saint lawrence river from cape vincent to saint regis
1002 am edt sun aug 23 2026

.this afternoon...south winds 10 to 15 knots becoming southwest.
showers likely with a chance of thunderstorms. 
.tonight...southwest winds 5 to 15 knots. a chance of showers and
thunderstorms early, then a chance of showers. showers likely
late. 
.monday...south winds 5 to 15 knots becoming southwest. showers
in the morning, then showers with a chance of thunderstorms in
the afternoon. 
.monday night...southwest winds 5 to 15 knots. showers with a
chance of thunderstorms in the evening, then showers overnight. 
.tuesday...west winds 10 knots or less. a chance of showers. 
.wednesday...southwest winds 10 knots or less becoming south.
partly cloudy. 
.thursday...south winds 5 to 10 knots. a chance of showers and
thunderstorms during the day, then showers likely with a chance
of thunderstorms thursday night. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sun aug 23 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 cold front continues to sweep eastward across lake 
ontario through this early afternoon. behind the front, a trough 
averaging 29.8 inches lingers over lake ontario through monday. on 
tuesday through wednesday, a ridge averaging 30.1 inches builds from 
the western and central great lakes. the ridge should begin to exit 
eastward on thursday and allow a warm front to sweep northeastward 
across lake ontario. on friday, a cold front should sweep eastward 
across the lake and be followed by a high pressure ridge averaging 
30.0 inches and building from the upper midwest.


loz062-232100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt sun aug 23 2026

.rest of today...west winds 15 to 25 knots. a chance of
waterspouts. a chance of showers late this morning, then showers
with a chance of thunderstorms this afternoon. waves 3 to 6 feet.
.tonight...west winds 15 to 25 knots. a chance of waterspouts.
showers likely with a chance of thunderstorms early, then a
chance of showers. showers likely late. waves 4 to 6 feet. 
.monday...southwest winds to 30 knots becoming west. a chance of
waterspouts. showers. waves 4 to 7 feet building to 6 to 9 feet.
waves occasionally around 11 feet. 
.monday night...west winds 15 to 25 knots. a chance of
waterspouts. showers likely in the evening, then a chance of
showers overnight. waves 5 to 8 feet subsiding to 3 to 6 feet.
waves occasionally around 10 feet. 
.tuesday...west winds 15 to 20 knots becoming northwest and
diminishing to less than 10 knots. a chance of waterspouts during
the day. a chance of showers during the day. waves 3 to 5 feet
subsiding to 1 foot or less. 
.wednesday...southwest winds 10 knots or less becoming south.
waves 1 foot or less. 
.thursday...south winds 5 to 10 knots becoming southwest. a
chance of showers and thunderstorms. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sun aug 23 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 cold front continues to sweep eastward across lake 
ontario through this early afternoon. behind the front, a trough 
averaging 29.8 inches lingers over lake ontario through monday. on 
tuesday through wednesday, a ridge averaging 30.1 inches builds from 
the western and central great lakes. the ridge should begin to exit 
eastward on thursday and allow a warm front to sweep northeastward 
across lake ontario. on friday, a cold front should sweep eastward 
across the lake and be followed by a high pressure ridge averaging 
30.0 inches and building from the upper midwest.


loz063>065-232100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt sun aug 23 2026

.rest of today...southwest winds 15 to 20 knots becoming west and
increasing to 30 knots. a chance of waterspouts. a chance of
showers and thunderstorms, then showers with a chance of
thunderstorms late. waves 2 to 4 feet building to 4 to 7 feet.
waves occasionally around 9 feet. 
.tonight...west winds 15 to 25 knots becoming southwest. a chance
of waterspouts. showers with a chance of thunderstorms in the
evening, then showers after midnight. waves 4 to 7 feet. waves
occasionally around 9 feet. 
.monday...southwest winds 15 to 25 knots increasing to 30 knots.
a chance of waterspouts. showers in the morning, then showers
with a chance of thunderstorms in the afternoon. waves 3 to
6 feet building to 6 to 9 feet. waves occasionally around
11 feet. 
.monday night...southwest winds 15 to 25 knots becoming west. a
chance of waterspouts. showers with a chance of thunderstorms in
the evening, then showers overnight. waves 5 to 9 feet subsiding
to 4 to 7 feet. waves occasionally around 11 feet. 
.tuesday...west winds 15 to 20 knots becoming northwest 5 to
15 knots. a chance of waterspouts during the day. showers during
the day. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.wednesday...west winds 5 to 15 knots becoming southeast. waves
2 feet or less. 
.thursday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. a chance of showers and thunderstorms during the day,
then showers likely with a chance of thunderstorms thursday
night. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake erie
national weather service cleveland oh
1021 am edt sun aug 23 2026

for waters beyond five nautical miles of shore on lake erie

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 trough averaging 29.80 will linger over the eastern great lakes 
through monday morning. high pressure 30.00 inches will gradually 
build into the region monday afternoon through tuesday night 
before departing to the east on wednesday. low pressure 29.80 
inches and a trailing cold front will move across the great lakes
late wednesday through thursday.


lez061-166>169-232015-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
avon point to willowick oh beyond 5 nm off shoreline to us-
canadian border-willowick to geneva-on-the-
lake oh beyond 5nm off shoreline to us-canadian border-geneva-on-
the-lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
1021 am edt sun aug 23 2026

.this afternoon...west winds 15 to 25 knots. a chance of
waterspouts. a chance of showers and thunderstorms. waves 4 to
6 feet. 
.tonight...west winds 15 to 20 knots becoming northwest. a chance
of waterspouts. showers with a chance of thunderstorms in the
evening, then a chance of showers and thunderstorms after
midnight. a chance of showers with a slight chance of
thunderstorms late. waves 3 to 6 feet. 
.monday...west winds 15 to 25 knots. a chance of waterspouts. a
chance of showers. waves 3 to 6 feet building to 5 to 7 feet.
waves occasionally around 9 feet. 
.monday night...west winds 15 to 25 knots becoming northwest and
diminishing to 10 to 15 knots. a chance of showers in the
evening. a chance of waterspouts. waves 4 to 7 feet subsiding to
1 to 3 feet. waves occasionally around 9 feet. 
.tuesday...northwest winds 5 to 15 knots becoming southwest.
waves 1 to 3 feet subsiding to 1 foot or less. 
.wednesday...southwest winds 5 to 15 knots becoming south. a
chance of showers wednesday night. waves 2 feet or less. 
.thursday...south winds 5 to 15 knots becoming west. a chance of
showers and thunderstorms during the day, then a chance of
showers thursday night. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$