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


slz022-024-162100-
saint lawrence river from cape vincent to saint regis
1003 am edt sun aug 16 2026

.this afternoon...southeast winds less than 10 knots becoming
northeast. sunny, then becoming mostly cloudy. 
.tonight...east winds 5 to 15 knots becoming southwest. showers
with a chance of thunderstorms through the early overnight, then
a chance of showers late. 
.monday...southwest winds less than 10 knots becoming northwest.
a chance of showers. 
.monday night...northwest winds less than 10 knots. patchy fog
overnight. 
.tuesday...light and variable winds becoming south 5 to 10 knots.
patchy fog during the day. a chance of showers tuesday night. 
.wednesday...southwest winds 10 knots or less becoming west.
showers likely with a chance of thunderstorms during the day,
then a chance of showers and thunderstorms wednesday night. 
.thursday...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
1002 am 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...
high pressure will continue to exit eastward today before a warm 
front drifts northeastward across lake ontario this evening and is 
followed by a cold frontal passage tonight. behind the 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.


loz062-162100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt sun aug 16 2026

.this afternoon...east winds 10 to 15 knots. waves 1 to 2 feet. 
.tonight...east winds 5 to 15 knots becoming west. a chance of
showers and thunderstorms in the evening, then a chance of
showers after midnight. waves 1 foot or less. 
.monday...northwest winds 5 to 10 knots becoming west. waves
2 feet or less. 
.monday night...northwest winds 5 to 10 knots. waves 2 feet or
less. 
.tuesday...west winds 10 knots or less becoming southwest 10 to
15 knots. a chance of showers and thunderstorms tuesday night.
waves 2 feet or less. 
.wednesday...west winds 10 to 15 knots becoming northwest. a
chance of showers and thunderstorms during the day, then a chance
of showers wednesday night. waves 1 to 2 feet. 
.thursday...northwest winds 5 to 10 knots. waves 1 foot 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 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...
high pressure will continue to exit eastward today before a warm 
front drifts northeastward across lake ontario this evening and is 
followed by a cold frontal passage tonight. behind the 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.


loz063>065-162100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt sun aug 16 2026

.this afternoon...east winds 10 to 15 knots becoming northeast
15 to 20 knots. waves 2 feet or less. 
.tonight...southeast winds 15 to 20 knots becoming southwest
10 to 15 knots. a chance of showers and thunderstorms through the
early overnight, then a chance of showers late. waves 1 to
3 feet. 
.monday...west winds 5 to 10 knots becoming northwest. a chance
of showers. waves 2 feet or less. 
.monday night...west winds 10 knots or less becoming north. waves
2 feet or less. 
.tuesday...northwest winds 10 knots or less becoming southwest
10 to 15 knots. a chance of showers tuesday night. waves 2 feet
or less. 
.wednesday...west winds 5 to 15 knots becoming northwest. showers
likely with a chance of thunderstorms during the day, then a
chance of showers and thunderstorms wednesday night. waves 1 to
2 feet. 
.thursday...northwest winds 5 to 10 knots becoming west. waves
2 feet or less. 

winds and waves higher in and near thunderstorms.

$$