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


slz022-024-191500-
saint lawrence river from cape vincent to saint regis
402 am edt fri jun 19 2026

.today...southwest winds 10 to 15 knots becoming west 15 to
20 knots. showers with a chance of thunderstorms this afternoon. 
.tonight...west winds 15 to 20 knots diminishing to 5 to
15 knots. showers with a chance of thunderstorms early, then
showers likely late in the evening. a chance of showers after
midnight. 
.saturday...west winds 5 to 10 knots. a chance of showers in the
morning, then showers with a chance of thunderstorms in the
afternoon. 
.saturday night...west winds 5 to 10 knots becoming light and
variable. showers with a chance of thunderstorms in the evening,
then a chance of showers overnight. 
.sunday...west winds less than 10 knots. showers likely with a
chance of thunderstorms. 
.monday...south winds 10 knots or less becoming north. showers
likely. 
.tuesday...northwest winds 5 to 10 knots becoming light and
variable. a chance of showers. 

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 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 29.1 inch low will move into the 
canadian maritimes today while filling to 29.4 inches, eventually 
moving east of newfoundland by saturday night. a weak ridge of high 
pressure averaging 29.9 inches will then build into the great lakes 
saturday night through sunday. a 29.6 inch low is then forecast to 
move over or just south of the lower great lakes monday, before 
moving off the new england coast by tuesday.


loz062-191500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt fri jun 19 2026

.today...west winds 15 to 20 knots. waves 3 to 6 feet. 
.tonight...west winds 15 to 20 knots. waves 3 to 5 feet. 
.saturday...west winds 15 to 20 knots diminishing to 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 southeast. a
chance of showers sunday night. waves 1 foot or less. 
.monday...east winds 15 to 20 knots becoming northwest 10 to
15 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. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 29.1 inch low will move into the 
canadian maritimes today while filling to 29.4 inches, eventually 
moving east of newfoundland by saturday night. a weak ridge of high 
pressure averaging 29.9 inches will then build into the great lakes 
saturday night through sunday. a 29.6 inch low is then forecast to 
move over or just south of the lower great lakes monday, before 
moving off the new england coast by tuesday.


loz063>065-191500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt fri jun 19 2026

.today...west winds 20 to 25 knots. waves 5 to 8 feet. waves
occasionally around 10 feet. 
.tonight...west winds 20 to 25 knots. waves 4 to 7 feet. waves
occasionally around 9 feet. 
.saturday...west winds 15 to 20 knots. waves 4 to 7 feet
subsiding to 3 to 6 feet. waves occasionally around 9 feet. 
.saturday night...west winds 15 to 20 knots diminishing to 5 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.sunday...west winds 10 knots or less becoming south. a chance of
showers sunday night. waves 2 feet or less. 
.monday...southeast winds 10 to 15 knots becoming northwest.
showers during the day, then showers likely monday night. waves
1 foot or less building to 1 to 3 feet. 
.tuesday...northwest winds 5 to 15 knots becoming west. waves
1 to 3 feet. 

$$