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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm edt tue aug 18 2026


slz022-024-190900-
saint lawrence river from cape vincent to saint regis
1002 pm edt tue aug 18 2026

.overnight...southwest winds 5 to 10 knots becoming south.
mostly cloudy. 
.wednesday...southwest winds 5 to 10 knots. showers in the
morning, then showers likely with a chance of thunderstorms early
in the afternoon. a chance of showers and thunderstorms late. 
.wednesday night...southwest winds 5 to 10 knots becoming light
and variable. partly cloudy. 
.thursday...light and variable winds becoming west 5 to 10 knots.
mostly sunny. 
.thursday night...west winds 5 to 10 knots becoming light and
variable. patchy fog overnight. 
.friday...light and variable winds. patchy fog during the day. 
.saturday...southeast winds 10 knots or less becoming south. a
chance of showers during the day, then showers with a chance of
thunderstorms saturday night. 
.sunday...south winds 5 to 10 knots becoming west. showers with a
chance of thunderstorms. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt tue aug 18 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 eastern seaboard tonight. a cold front will then move 
east across lake ontario on wednesday. behind the front, a ridge of 
high pressure averaging 30.1 inches builds from the upper great 
lakes thursday to the lower great lakes friday. this high will drift 
east to the canadian maritimes saturday as a 29.7 inch low moves 
into northwest ontario province.


loz063>065-190900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt tue aug 18 2026

.overnight...southwest winds 10 to 15 knots. waves 2 feet
or less. 
.wednesday...southwest winds 10 to 15 knots becoming west. a
chance of showers early, then showers likely. a chance of showers
late. waves 1 to 3 feet. 
.wednesday night...west winds 5 to 10 knots becoming northwest.
waves 1 to 2 feet. 
.thursday...northwest winds 5 to 10 knots becoming west. waves
1 foot or less. 
.thursday night...west winds 10 knots or less becoming north.
waves 1 foot or less. 
.friday...east winds 10 knots or less becoming southeast. waves
1 foot or less. 
.saturday...south winds 5 to 15 knots. a chance of showers and
thunderstorms during the day, then showers with a chance of
thunderstorms saturday night. waves 2 feet or less. 
.sunday...southwest winds 10 to 15 knots becoming northwest 15 to
20 knots. showers with a chance of thunderstorms. waves 1 to
3 feet building to 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$