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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt fri jun 19 2026


slz022-024-200900-
saint lawrence river from cape vincent to saint regis
1003 pm edt fri jun 19 2026

.overnight...west winds 5 to 15 knots. a chance of showers.
.saturday...west winds 5 to 10 knots. a chance of showers late in
the morning. a chance of showers and thunderstorms early in the
afternoon, then showers likely with a chance of thunderstorms
late. 
.saturday night...west winds 5 to 10 knots becoming light and
variable. a chance of showers and thunderstorms in the evening,
then a chance of showers overnight. 
.sunday...southwest winds 10 knots or less becoming west. a
chance of showers in the morning, then showers likely with a
chance of thunderstorms in the afternoon. 
.sunday night...southwest winds less than 10 knots. showers
likely with a chance of thunderstorms in the evening. 
.monday...south winds less than 10 knots becoming northwest.
showers likely. 
.tuesday...northwest winds less than 10 knots. partly cloudy. 
.wednesday...west winds less than 10 knots. 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
1002 pm edt fri jun 19 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...an unseasonably strong 29.2 inch low will linger over 
the canadian maritimes through saturday evening before exiting 
eastward over the atlantic. a weak ridge of high pressure averaging 
29.9 inches will then build over the great lakes saturday night 
through sunday. a 29.7 inch low is then forecast to move south of 
the lower great lakes monday and monday night, before moving off the 
new england coast by tuesday. a broad area of high pressure 
averaging 30.1 inches will advance over the eastern great lakes 
region wednesday and thursday of next week.


loz062-200900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt fri jun 19 2026

.overnight...west winds 15 to 20 knots. waves 3 to 5 feet. 
.saturday...west winds 10 to 15 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.saturday night...west winds 10 knots or less. waves 1 to 3 feet
subsiding to 1 foot or less. 
.sunday...west winds 10 knots or less becoming southwest. waves
1 foot or less. 
.sunday night...southwest winds 10 knots or less becoming east. a
chance of showers overnight. waves 1 foot or less. 
.monday...east winds 10 to 15 knots becoming northwest around
10 knots. showers likely during the day, then a chance of showers
monday night. waves 1 to 3 feet. 
.tuesday...northwest winds 5 to 10 knots. waves 2 feet or less. 
.wednesday...west winds less than 10 knots becoming southeast. a
chance of showers wednesday night. waves 1 foot or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt fri jun 19 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...an unseasonably strong 29.2 inch low will linger over 
the canadian maritimes through saturday evening before exiting 
eastward over the atlantic. a weak ridge of high pressure averaging 
29.9 inches will then build over the great lakes saturday night 
through sunday. a 29.7 inch low is then forecast to move south of 
the lower great lakes monday and monday night, before moving off the 
new england coast by tuesday. a broad area of high pressure 
averaging 30.1 inches will advance over the eastern great lakes 
region wednesday and thursday of next week.


loz063>065-200900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt fri jun 19 2026

.overnight...west winds 15 to 25 knots. waves 4 to 7 feet.
waves occasionally around 9 feet. 
.saturday...west winds 15 to 20 knots. waves 3 to 6 feet. 
.saturday night...west winds 5 to 15 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.sunday...west winds 5 to 10 knots. waves 1 foot or less. 
.sunday night...west winds 10 knots or less becoming south. a
chance of showers overnight. waves 1 foot or less. 
.monday...southeast winds 5 to 15 knots becoming northwest.
showers likely. waves 2 feet or less. 
.tuesday...northwest winds 5 to 15 knots becoming west. waves
1 to 3 feet. 
.wednesday...west winds 10 knots or less becoming south. a chance
of showers wednesday night. waves 1 foot or less. 

$$