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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt fri aug 21 2026


slz022-024-220300-
saint lawrence river from cape vincent to saint regis
403 pm edt fri aug 21 2026

.tonight...northeast winds 10 knots or less becoming east. mainly
clear. 
.saturday...southeast winds 10 knots or less. sunny.
.saturday night...southeast winds 10 knots or less increasing to
10 to 15 knots. a chance of showers and thunderstorms in the
evening, then showers likely with a chance of thunderstorms
overnight. 
.sunday...southeast winds 5 to 15 knots becoming southwest.
showers with a chance of thunderstorms. 
.sunday night...southwest winds 5 to 15 knots. showers with a
chance of thunderstorms in the evening, then a chance of showers
overnight. 
.monday...southwest winds 5 to 10 knots. showers.
.tuesday...west winds 10 knots or less becoming southwest. mostly
cloudy, then clearing. 
.wednesday...southwest winds 10 knots or less becoming south.
partly to mostly 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 pm edt fri aug 21 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 will drift east across the canadian 
maritimes tonight through saturday. an elongated 29.7 inch low will 
slowly make its way from the central great lakes to western quebec 
saturday and sunday, while pushing its associated warm and cold 
fronts across the lake between saturday night and sunday morning. 
the low will wobble across western quebec through monday, then eject 
northeastward into labrador on tuesday while a 30.1 inch high builds 
eastward across the ohio valley.


loz063>065-220300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt fri aug 21 2026

.tonight...northeast winds 5 to 15 knots becoming southeast 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday...southeast winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers and thunderstorms late. waves 2 to
4 feet subsiding to 1 foot or less. 
.saturday night...southeast winds 10 to 15 knots becoming south
15 to 20 knots. showers with a chance of thunderstorms. waves
1 to 3 feet building to 2 to 4 feet. 
.sunday...south winds 15 to 20 knots becoming west. showers with
a chance of thunderstorms. waves 2 to 4 feet building to 3 to
5 feet. 
.sunday night...west winds 15 to 20 knots. showers with a chance
of thunderstorms in the evening, then showers overnight. waves
3 to 6 feet. 
.monday...west winds 15 to 25 knots. showers with a chance of
thunderstorms. waves 3 to 6 feet. 
.tuesday...west winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers during the day. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.wednesday...southwest winds 10 knots or less becoming south
10 to 15 knots. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$