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


slz022-024-240300-
saint lawrence river from cape vincent to saint regis
403 pm edt sun aug 23 2026

.tonight...southwest winds 5 to 15 knots. a chance of showers and
thunderstorms early, then showers likely late this evening.
showers after midnight. 
.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 10 knots. showers with a
chance of thunderstorms in the evening, then a chance of showers
overnight. 
.tuesday...west winds 5 to 10 knots. a chance of showers in the
morning, then showers likely in the afternoon. 
.tuesday night...west winds less than 10 knots. showers likely in
the evening. 
.wednesday...southwest winds 10 knots or less becoming southeast.
partly cloudy. 
.thursday...south winds 5 to 10 knots becoming southwest. a
chance of showers during the day, then showers likely 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 pm 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 cold front continues to sweep eastward across lake 
ontario this evening. behind the 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. 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.


loz063>065-240300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt sun aug 23 2026

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

winds and waves higher in and near thunderstorms.

$$