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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am edt sun aug 23 2026


slz022-024-231500-
saint lawrence river from cape vincent to saint regis
402 am edt sun aug 23 2026

.today...southeast winds 10 to 15 knots becoming southwest.
showers with a chance of thunderstorms. 
.tonight...southwest winds 5 to 15 knots. a chance of showers and
thunderstorms early, then a chance of showers. showers likely
late. 
.monday...south winds 5 to 15 knots becoming southwest. showers
in the morning, then showers with a chance of thunderstorms in
the afternoon. 
.monday night...southwest winds 5 to 15 knots. showers with a
chance of thunderstorms in the evening, then showers overnight. 
.tuesday...west winds 10 knots or less. a chance of showers. 
.wednesday...southwest winds 10 knots or less becoming south.
partly cloudy. 
.thursday...south winds 5 to 10 knots. a chance of showers and
thunderstorms during the day, then showers likely with a chance
of thunderstorms 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
402 am edt sun aug 23 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 northwest of the lake this morning will 
slowly wobble northeastward across southern quebec through monday. 
in response to the low's track a cold front sweeps eastward across 
the lake through midday today. 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>065-231500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sun aug 23 2026

.today...south winds 15 to 20 knots becoming west and increasing
to 30 knots. a chance of waterspouts. showers with a chance of
thunderstorms this morning, then a chance of showers and
thunderstorms early this afternoon. showers with a chance of
thunderstorms late. waves 2 to 4 feet building to 4 to 7 feet.
waves occasionally around 9 feet. 
.tonight...west winds 15 to 25 knots becoming southwest. a chance
of waterspouts. showers with a chance of thunderstorms in the
evening, then showers after midnight. waves 4 to 7 feet. waves
occasionally around 9 feet. 
.monday...southwest winds 15 to 25 knots increasing to 30 knots.
a chance of waterspouts. showers in the morning, then showers
with a chance of thunderstorms in the afternoon. waves 3 to
6 feet building to 6 to 9 feet. waves occasionally around
11 feet. 
.monday night...southwest winds 15 to 25 knots becoming west. a
chance of waterspouts. showers with a chance of thunderstorms in
the evening, then showers overnight. waves 5 to 9 feet subsiding
to 4 to 7 feet. waves occasionally around 11 feet. 
.tuesday...west winds 15 to 20 knots becoming northwest 5 to
15 knots. a chance of waterspouts during the day. showers during
the day. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.wednesday...west winds 5 to 15 knots becoming southeast. waves
2 feet or less. 
.thursday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. a chance of showers and thunderstorms during the day,
then showers likely with a chance of thunderstorms thursday
night. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$