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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
404 pm edt fri jul 31 2026


slz022-024-010300-
saint lawrence river from cape vincent to saint regis
404 pm edt fri jul 31 2026

.tonight...southwest winds 10 knots or less becoming south.
mainly clear early, then becoming mostly cloudy. 
.saturday...south winds less than 10 knots. mostly cloudy. 
.saturday night...light and variable winds. showers likely
overnight. 
.sunday...south winds less than 10 knots becoming southeast.
showers likely in the morning, then showers with a chance of
thunderstorms in the afternoon. 
.sunday night...southeast winds 10 knots or less becoming south.
showers with a chance of thunderstorms in the evening, then
showers overnight. 
.monday...southwest winds 10 knots or less becoming north.
showers with a chance of thunderstorms during the day, then a
chance of showers and thunderstorms monday night. 
.tuesday...northeast winds less than 10 knots. mainly clear, then
becoming partly cloudy. 
.wednesday...southeast winds less than 10 knots. showers likely. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt fri jul 31 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 ridge of high pressure averaging 30.0 inches will 
drift to the mid atlantic tonight, then off the east coast saturday. 
an elongated 29.7 inch low will then move from the ohio valley 
sunday to the lower great lakes sunday night, with a remnant trough 
drifting towards new england monday. a 30.0 inch high will then 
build east across ontario and quebec monday through tuesday.


loz063>065-010300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt fri jul 31 2026

.tonight...southwest winds 5 to 10 knots becoming south. waves
1 foot or less. 
.saturday...south winds 5 to 10 knots becoming east. waves 1 foot
or less. 
.saturday night...east winds 5 to 10 knots becoming southeast. a
chance of showers in the evening, then showers likely overnight.
waves 2 feet or less. 
.sunday...southeast winds 5 to 15 knots. showers in the morning,
then showers with a chance of thunderstorms in the afternoon.
waves 2 feet or less. 
.sunday night...southeast winds 5 to 15 knots. showers with a
chance of thunderstorms in the evening, then showers overnight.
waves 1 to 2 feet. 
.monday...southeast winds 5 to 15 knots becoming northeast.
showers likely during the day, then a chance of showers monday
night. waves 2 feet or less. 
.tuesday...northeast winds 5 to 10 knots becoming southeast.
waves 1 foot or less. 
.wednesday...south winds 10 knots or less becoming southwest. a
chance of showers. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$