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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
404 pm edt sun aug 2 2026


slz022-024-030300-
saint lawrence river from cape vincent to saint regis
404 pm edt sun aug 2 2026

.tonight...southeast winds 5 to 15 knots becoming south. showers
with a chance of thunderstorms. 
.monday...west winds 5 to 15 knots becoming northwest. showers
likely with a chance of thunderstorms in the morning, then a
chance of showers in the afternoon. 
.monday night...northwest winds 10 knots or less becoming west. a
chance of showers in the evening. 
.tuesday...west winds less than 10 knots becoming southwest.
sunny.
.tuesday night...southwest winds less than 10 knots. mainly
clear. 
.wednesday...south winds 10 knots or less. a chance of showers
wednesday night. 
.thursday...south winds 10 knots or less becoming southwest. a
chance of showers and thunderstorms. 
.friday...west winds less than 10 knots. a chance of showers. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt sun aug 2 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...an elongated 29.7 inch low will continue to move into 
the lower great lakes tonight, with a remnant trough drifting 
towards new england monday. a 30.0 inch high will then build east 
across ontario and quebec monday through tuesday.


loz062-030300-
lake ontario open waters from the niagara river to hamlin beach-
403 pm edt sun aug 2 2026

.tonight...northeast winds 10 to 15 knots becoming northwest
15 to 20 knots. showers with thunderstorms likely early, then
showers with a chance of thunderstorms late this evening. a
chance of showers after midnight. waves 1 to 3 feet building to
2 to 4 feet. 
.monday...northwest winds 15 to 20 knots becoming west. a chance
of showers early. waves 2 to 4 feet. 
.monday night...west winds 5 to 15 knots. waves 1 to 3 feet
subsiding to 1 foot or less. 
.tuesday...west winds less than 10 knots. waves 1 foot or less. 
.tuesday night...southeast winds 10 knots or less becoming south.
waves 1 foot or less. 
.wednesday...south winds less than 10 knots becoming southwest.
waves 1 foot or less. 
.thursday...southwest winds less than 10 knots becoming west. a
chance of showers thursday night. waves 1 foot or less. 
.friday...west winds less than 10 knots becoming southwest. a
chance of showers. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

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glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt sun aug 2 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...an elongated 29.7 inch low will continue to move into 
the lower great lakes tonight, with a remnant trough drifting 
towards new england monday. a 30.0 inch high will then build east 
across ontario and quebec monday through tuesday.


loz063>065-030300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt sun aug 2 2026

.tonight...southeast winds 15 to 20 knots becoming southwest.
showers with a chance of thunderstorms. waves 2 to 4 feet. 
.monday...northwest winds 15 to 20 knots becoming west. a chance
of showers through early afternoon. waves 2 to 4 feet building to
3 to 5 feet. 
.monday night...west winds 15 to 20 knots becoming northwest 5 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.tuesday...west winds 5 to 10 knots. waves 2 feet or less. 
.tuesday night...southeast winds 10 knots or less becoming south.
waves 1 foot or less. 
.wednesday...south winds 10 knots or less. a chance of showers
wednesday night. waves 1 foot or less. 
.thursday...south winds 10 knots or less becoming west. a chance
of showers and thunderstorms. waves 1 foot or less. 
.friday...west winds 10 knots or less becoming southwest. a
chance of showers. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake erie
national weather service cleveland oh
357 pm edt sun aug 2 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...
low pressure 29.70 inches will move east just to the south of the
lake through tonight before exiting to the northeast early monday.
high pressure 30.00 inches will build over the region monday
through tuesday. low pressure 29.90 inches will cross the lake on
wednesday with a slow-moving frontal boundary approaching from 
the west thursday and friday.


lez061-168-169-030215-
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-
357 pm edt sun aug 2 2026

.tonight...north winds 15 to 20 knots. showers with a chance of
thunderstorms this evening, then a chance of showers with a
slight chance of thunderstorms after midnight. waves 1 to 3 feet
building to 2 to 4 feet. 
.monday...north winds 5 to 15 knots becoming west. waves 1 to
3 feet. 
.monday night...northwest winds 10 knots or less becoming east.
waves 1 foot or less. 
.tuesday...south winds less than 10 knots becoming north. waves
1 foot or less. 
.tuesday night...northeast winds 10 knots or less becoming south.
waves 1 foot or less. 
.wednesday...south winds 10 knots or less. waves 1 foot or less. 
.thursday...southwest winds 10 knots or less. showers likely with
a chance of thunderstorms thursday night. waves 1 foot or less. 
.friday...southwest winds 10 knots or less. a chance of showers.
waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$