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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt sun aug 16 2026


slz022-024-170900-
saint lawrence river from cape vincent to saint regis
1003 pm edt sun aug 16 2026

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

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sun aug 16 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 29.7 inch low will move across james bay through this evening. 
behind a cold front, a trough averaging 29.8 inches should linger 
over lake ontario through monday. a 30.0 inch high will build from 
the upper midwest monday night and traverse lake ontario tuesday. 
the ridge will begin to exit east tuesday night before a cold front 
sweeps southeastward across the lake wednesday through wednesday 
night. a 30.1 inch high will build across the great lakes thursday 
through friday.


loz062-170900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt sun aug 16 2026

.overnight...west winds 10 knots or less. waves 1 to
2 feet. 
.monday...northwest winds 5 to 15 knots becoming west. waves
2 feet or less. 
.monday night...west winds 5 to 10 knots becoming northwest.
waves 2 feet or less. 
.tuesday...northwest winds 10 knots or less becoming southwest.
waves 1 foot or less. 
.tuesday night...southwest winds 10 to 15 knots becoming west. a
chance of showers overnight. waves 2 feet or less. 
.wednesday...west winds 5 to 15 knots becoming northwest. a
chance of showers during the day. waves 1 to 2 feet. 
.thursday...northwest winds 5 to 10 knots. waves 1 foot or less. 
.friday...north winds 10 knots or less becoming south. waves
1 foot or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sun aug 16 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 29.7 inch low will move across james bay through this evening. 
behind a cold front, a trough averaging 29.8 inches should linger 
over lake ontario through monday. a 30.0 inch high will build from 
the upper midwest monday night and traverse lake ontario tuesday. 
the ridge will begin to exit east tuesday night before a cold front 
sweeps southeastward across the lake wednesday through wednesday 
night. a 30.1 inch high will build across the great lakes thursday 
through friday.


loz063>065-170900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt sun aug 16 2026

.overnight...south winds 15 to 20 knots becoming southwest.
a chance of showers. waves 2 to 4 feet subsiding to 2 feet or
less. 
.monday...west winds 10 to 15 knots becoming northwest. a chance
of showers early. a chance of showers in the afternoon. waves
2 feet or less. 
.monday night...northwest winds 10 knots or less becoming north.
waves 2 feet or less. 
.tuesday...north winds 10 knots or less becoming west. waves
1 foot or less. 
.tuesday night...southwest winds 5 to 15 knots. a chance of
showers overnight. waves 2 feet or less. 
.wednesday...west winds 5 to 15 knots becoming northwest. showers
likely during the day. waves 1 to 3 feet. 
.thursday...northwest winds 5 to 10 knots. waves 1 foot or less. 
.friday...southwest winds 10 knots or less becoming south. waves
1 foot or less. 

$$