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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt thu jun 18 2026


slz022-024-190900-
saint lawrence river from cape vincent to saint regis
1003 pm edt thu jun 18 2026

.rest of tonight...west winds 15 to 20 knots becoming southwest
10 to 15 knots. a chance of showers late this evening, then
showers likely after midnight. 
.friday...southwest winds 10 to 15 knots becoming west 15 to
20 knots. a chance of showers and thunderstorms early in the
afternoon. showers with a chance of thunderstorms late. 
.friday night...west winds 15 to 20 knots diminishing to 5 to
15 knots. showers with a chance of thunderstorms in the evening,
then showers likely overnight. 
.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 less than 10 knots becoming north. a chance
of showers. 
.tuesday...northwest winds less than 10 knots. a chance of
showers and 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 thu jun 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...an unseasonably strong 29.1 inch low will move across 
southern quebec through tonight. this low will then move slowly east 
to the canadian maritimes friday 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.


loz062-190900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt thu jun 18 2026

.overnight...west winds 15 to 25 knots. waves 5 to 9 feet
subsiding to 4 to 7 feet. waves occasionally around 11 feet. 
.friday...west winds 15 to 20 knots. waves 3 to 6 feet. 
.friday night...west winds 15 to 20 knots. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.saturday...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet. 
.saturday night...west winds 5 to 15 knots. 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 10 to 15 knots becoming north. a chance of
showers. waves 1 to 3 feet. 
.tuesday...northwest winds 5 to 15 knots. waves 1 to 2 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt thu jun 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...an unseasonably strong 29.1 inch low will move across 
southern quebec through tonight. this low will then move slowly east 
to the canadian maritimes friday 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>065-190900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt thu jun 18 2026

.overnight...west winds to 30 knots. waves 9 to 12 feet
subsiding to 7 to 10 feet. waves occasionally around 15 feet. 
.friday...west winds 20 to 25 knots. waves 5 to 8 feet. waves
occasionally around 10 feet. 
.friday night...west winds 15 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 5 to 15 knots becoming north. showers
likely with a chance of thunderstorms during the day, then a
chance of showers and thunderstorms monday night. waves 2 feet or
less. 
.tuesday...northwest winds 5 to 15 knots becoming west. waves
1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$