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


slz022-024-211500-
saint lawrence river from cape vincent to saint regis
403 am edt fri aug 21 2026

.today...light and variable winds. sunny.
.tonight...northeast winds less than 10 knots. mainly clear
through the early overnight, then becoming partly cloudy. 
.saturday...light and variable winds. sunny.
.saturday night...southeast winds 10 knots or less. a chance of
showers in the evening, then showers overnight. 
.sunday...southeast winds 5 to 10 knots becoming southwest.
showers with a chance of thunderstorms. 
.monday...southwest winds 5 to 10 knots. showers likely with a
chance of thunderstorms. 
.tuesday...west winds 10 knots or less becoming southwest. 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 am 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 over southern quebec will slide across new england 
today, then into the canadian maritimes 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 about western quebec through 
monday, then wil eject northeastward into labrador on tuesday while 
a 30.1 inch high builds eastward across the ohio valley.


loz063>065-211500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt fri aug 21 2026

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

winds and waves higher in and near thunderstorms.

$$