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


slz022-024-221500-
saint lawrence river from cape vincent to saint regis
403 am edt sat aug 22 2026

.today...southeast winds 10 knots or less. mostly sunny. 
.tonight...southeast winds 10 knots or less increasing to 10 to
15 knots. a chance of showers after midnight. a chance of showers
and thunderstorms late. 
.sunday...southeast winds 5 to 15 knots becoming southwest.
showers with a chance of thunderstorms. 
.sunday night...southwest winds 5 to 15 knots. showers likely
with a chance of thunderstorms in the evening, then showers
likely overnight. 
.monday...southwest winds 5 to 15 knots. showers.
.tuesday...west winds 5 to 10 knots becoming light and variable.
a chance of showers. 
.wednesday...southwest winds 10 knots or less becoming south.
partly cloudy. 

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 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 30.1 inch high over new england this morning will 
drift east across the canadian maritimes today. an elongated, and 
slightly deepening 29.7 inch low will slowly make its way from the 
central great lakes to western quebec today and sunday, while 
pushing its associated warm and cold fronts across the lake between 
to night and sunday morning. the now 29.6 inch area of low pressure 
will wobble across western quebec through monday, then eject 
northeastward across labrador on tuesday while a 30.1 inch high 
builds eastward across the ohio valley. this surface high will drift 
across the southern mid-atlantic states wednesday, and to the east 
coast by wednesday night.


loz063>065-221500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sat aug 22 2026

.today...southeast winds 15 to 20 knots diminishing to 5 to
15 knots. waves 2 to 4 feet subsiding to 1 foot or less. 
.tonight...southeast winds 10 to 15 knots becoming south and
increasing to 15 to 25 knots. showers likely with a chance of
thunderstorms. a chance of waterspouts after midnight. 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. waves 3 to
5 feet building to 3 to 6 feet. 
.sunday night...west winds 15 to 25 knots becoming southwest. a
chance of waterspouts. showers likely 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 to 30 knots becoming west 15 to
25 knots. a chance of waterspouts. showers. waves 4 to 7 feet
building to 6 to 9 feet, then subsiding to 4 to 7 feet. waves
occasionally around 11 feet. 
.tuesday...west winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of waterspouts during the day. showers likely
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. 

winds and waves higher in and near thunderstorms.

$$