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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt sat aug 22 2026


slz022-024-230900-
saint lawrence river from cape vincent to saint regis
1003 pm edt sat aug 22 2026

.overnight...southeast winds 5 to 15 knots. a chance of
showers and thunderstorms. showers likely with a
chance of thunderstorms late. 
.sunday...southeast winds 10 to 15 knots becoming southwest.
showers with a chance of thunderstorms. 
.sunday night...southwest winds 10 to 15 knots. a chance of
showers in the evening, then showers overnight. 
.monday...southwest winds 5 to 15 knots. showers in the morning,
then showers with a chance of thunderstorms in the afternoon. 
.monday night...southwest winds 5 to 10 knots. showers likely in
the evening, then a chance of showers overnight. 
.tuesday...west winds 5 to 10 knots becoming light and variable.
a chance of showers and thunderstorms. 
.wednesday...southwest winds less than 10 knots becoming south.
partly cloudy. 
.thursday...south winds 10 knots or less. a chance of showers
during the day, then showers likely thursday night. 

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 sat aug 22 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 29.6 inch low should wobble northeastward from the 
central great lakes to southwestern quebec through monday. in 
response to the low's track, a warm front drifts northeastward 
across lake ontario tonight and then a cold front sweeps eastward 
across the lake overnight tonight through sunday. behind the cold 
front, a trough averaging 29.8 inches lingers over lake ontario 
through monday. on tuesday through wednesday, a ridge averaging 
30.1 inches builds from the western and central great lakes. the 
ridge should begin to exit eastward on thursday and allow a warm 
front to sweep northeastward across lake ontario.


loz063>065-230900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt sat aug 22 2026

.overnight...south winds 15 to 25 knots. showers with a
chance of thunderstorms. waves 1 to 3 feet building to 3 to
5 feet. 
.sunday...south winds 15 to 25 knots becoming west. a chance of
waterspouts. showers with a chance of thunderstorms in the
morning, then a chance of showers and thunderstorms early in the
afternoon. showers with a chance of thunderstorms late. waves
3 to 5 feet building to 3 to 6 feet. 
.sunday night...west winds 15 to 20 knots becoming southwest. a
chance of waterspouts. showers with a chance of thunderstorms in
the evening, then showers overnight. waves 3 to 6 feet building
to 4 to 7 feet. waves occasionally around 9 feet. 
.monday...southwest winds 15 to 25 knots. a chance of
waterspouts. showers. waves 5 to 8 feet building to 6 to 9 feet.
waves occasionally around 11 feet. 
.monday night...west winds 15 to 20 knots. a chance of
waterspouts. showers. waves 5 to 9 feet subsiding to 3 to 6 feet.
waves occasionally around 11 feet. 
.tuesday...west winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of waterspouts. showers during the day, then a
chance of showers tuesday night. waves 3 to 6 feet subsiding to
1 to 3 feet. 
.wednesday...west winds 5 to 15 knots becoming south. waves
2 feet or less. 
.thursday...south winds 5 to 15 knots. a chance of showers during
the day, then showers likely thursday night. waves 2 feet or
less. 

winds and waves higher in and near thunderstorms.

$$