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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1004 pm edt sun aug 9 2026


slz022-024-100900-
saint lawrence river from cape vincent to saint regis
1004 pm edt sun aug 9 2026

.rest of tonight...southwest winds 10 knots or less becoming
south. partly cloudy late this evening, then becoming mostly
cloudy. 
.monday...south winds 5 to 10 knots becoming southwest. a chance
of showers early, then showers likely late in the morning.
showers with a chance of thunderstorms in the afternoon. 
.monday night...southwest winds 10 knots or less becoming west.
showers likely with a chance of thunderstorms in the evening,
then a chance of showers overnight. 
.tuesday...west winds 10 knots or less. partly to mostly sunny. 
.tuesday night...southwest winds 5 to 10 knots becoming light and
variable. partly cloudy. 
.wednesday...southwest winds less than 10 knots. a chance of
showers during the day, then showers likely with a chance of
thunderstorms wednesday night. 
.thursday...west winds 10 knots or less. showers likely with a
chance of thunderstorms. 
.friday...northwest winds 5 to 10 knots becoming light and
variable. becoming mainly clear. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1003 pm edt sun aug 9 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 high pressure ridge averaging 30.3 inches begins to 
exit tonight. on the backside of the ridge, a warm front sweeps 
northeastward across lake ontario tonight into monday morning. a 
cold front then sweeps eastward across the lake monday evening. 
behind the cold front, a trough averaging 29.8 inches should linger 
over the eastern great lakes through thursday. by this friday, a 
high pressure ridge averaging 30.0 inches should build from the 
upper great lakes.


loz062-100900-
lake ontario open waters from the niagara river to hamlin beach-
1003 pm edt sun aug 9 2026

.overnight...south winds 5 to 10 knots becoming southwest.
showers likely with a chance of thunderstorms late. waves 1 foot
or less. 
.monday...southwest winds 10 to 15 knots becoming west. showers
with a chance of thunderstorms early, then a chance of showers
and thunderstorms from late morning on. waves 2 feet or less. 
.monday night...west winds 10 to 15 knots. waves 1 to 2 feet. 
.tuesday...west winds 5 to 10 knots becoming southwest. waves
1 foot or less. 
.tuesday night...west winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.wednesday...northeast winds 10 knots or less becoming northwest.
a chance of showers and thunderstorms. waves 1 foot or less. 
.thursday...northwest winds 5 to 15 knots. waves 1 to 2 feet. 
.friday...northwest winds 5 to 10 knots becoming north. waves
1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1003 pm edt sun aug 9 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 high pressure ridge averaging 30.3 inches begins to 
exit tonight. on the backside of the ridge, a warm front sweeps 
northeastward across lake ontario tonight into monday morning. a 
cold front then sweeps eastward across the lake monday evening. 
behind the cold front, a trough averaging 29.8 inches should linger 
over the eastern great lakes through thursday. by this friday, a 
high pressure ridge averaging 30.0 inches should build from the 
upper great lakes.


loz063>065-100900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 pm edt sun aug 9 2026

.overnight...south winds 5 to 15 knots. waves 1 foot or
less. 
.monday...south winds 10 to 15 knots becoming west. showers
likely with a chance of thunderstorms in the morning, then a
chance of showers and thunderstorms in the afternoon. waves 1 to
2 feet. 
.monday night...west winds 10 to 15 knots becoming northwest. a
chance of showers in the evening. waves 1 to 2 feet. 
.tuesday...northwest winds 5 to 15 knots becoming west. waves
1 to 2 feet. 
.tuesday night...west winds 5 to 10 knots. waves 2 feet or less. 
.wednesday...west winds 10 knots or less. a chance of showers
during the day, then showers likely with a chance of
thunderstorms wednesday night. waves 1 foot or less. 
.thursday...northwest winds 10 to 15 knots. a chance of showers
during the day. waves 1 to 3 feet. 
.friday...northwest winds 5 to 10 knots becoming north. 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
950 pm edt sun aug 9 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 warm front will lift across lake erie this evening. three weak 
low pressure systems 29.90 inches will move through the region 
late tonight through wednesday. high pressure 30.00 inches will 
build into the region starting on thursday.


lez061-168-169-100815-
ripley to buffalo ny extending from 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-
950 pm edt sun aug 9 2026

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

winds and waves higher in and near thunderstorms.

$$