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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt mon aug 17 2026


slz022-024-171500-
saint lawrence river from cape vincent to saint regis
403 am edt mon aug 17 2026

.today...southwest winds 10 knots or less becoming northwest. a
chance of showers early. a chance of showers early this
afternoon. 
.tonight...northwest winds less than 10 knots. patchy fog from
late evening on. 
.tuesday...light and variable winds becoming west 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 10 knots or less becoming west.
showers with a chance of thunderstorms during the day, then
showers wednesday night. 
.thursday...light and variable winds. becoming mainly clear. 
.friday...light and variable winds. 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
402 am edt mon aug 17 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 sweeps eastward across lake ontario through this late 
morning. behind the front, a trough averaging 29.8 inches lingers 
over lake ontario today. a high pressure ridge averaging 30.0 inches 
builds from the upper midwest tonight and traverses lake ontario on 
tuesday. the ridge will begin to exit eastward tuesday night before 
a cold front sweeps southeastward across the lake wednesday. behind 
the cold front, a 30.1 inch high will build from the upper midwest 
through this friday.


loz062-171500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt mon aug 17 2026

.today...west winds 5 to 10 knots. waves 2 feet or less. 
.tonight...northwest winds 5 to 10 knots becoming north. 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. showers likely
overnight. waves 1 to 3 feet. 
.wednesday...west winds 5 to 15 knots becoming northwest. showers
likely during the day, then a chance of showers wednesday night.
waves 1 to 2 feet. 
.thursday...northwest winds 10 knots or less becoming north.
waves 1 foot or less. 
.friday...northeast 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
402 am edt mon aug 17 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 sweeps eastward across lake ontario through this late 
morning. behind the front, a trough averaging 29.8 inches lingers 
over lake ontario today. a high pressure ridge averaging 30.0 inches 
builds from the upper midwest tonight and traverses lake ontario on 
tuesday. the ridge will begin to exit eastward tuesday night before 
a cold front sweeps southeastward across the lake wednesday. behind 
the cold front, a 30.1 inch high will build from the upper midwest 
through this friday.


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lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt mon aug 17 2026

.today...southwest winds 5 to 15 knots becoming northwest. a
chance of showers and thunderstorms early, then a chance of
showers. waves 2 feet or less. 
.tonight...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...west winds 5 to 15 knots becoming southwest. a
chance of showers overnight. waves 2 feet or less. 
.wednesday...southwest winds 5 to 15 knots becoming northwest.
showers likely during the day, then a chance of showers wednesday
night. waves 1 to 3 feet. 
.thursday...northwest winds 10 knots or less. waves 1 foot or
less. 
.friday...southwest winds 10 knots or less becoming southeast.
waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$