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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 24 2026


slz022-024-241500-
saint lawrence river from cape vincent to saint regis
403 am edt mon aug 24 2026

.today...south winds 5 to 15 knots becoming southwest. showers
this morning, then showers with a chance of thunderstorms this
afternoon. 
.tonight...southwest winds 5 to 15 knots becoming west. showers
with a chance of thunderstorms early, then showers likely. a
chance of showers late. 
.tuesday...west winds less than 10 knots. a chance of showers. 
.tuesday night...west winds less than 10 knots. a chance of
showers in the evening. 
.wednesday...southwest winds 10 knots or less becoming south.
partly cloudy. 
.thursday...south winds 5 to 15 knots becoming southwest. a
chance of showers and thunderstorms during the day, then showers
likely with a chance of thunderstorms thursday night. 
.friday...southwest winds 10 knots or less becoming northwest. a
chance of showers. 

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 24 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...behind a recently departed cold front, a trough 
averaging 29.8 inches will linger over the lake today. 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. on friday, a cold front should sweep eastward 
across the lake and be followed by a high pressure ridge averaging 
30.0 inches and building from the upper midwest.


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lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt mon aug 24 2026

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

winds and waves higher in and near thunderstorms.

$$