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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1107 am edt thu jun 18 2026


slz022-024-182115-
saint lawrence river from cape vincent to saint regis
1107 am edt thu jun 18 2026

...small craft advisory in effect until 10 pm edt this evening...

.rest of today...southwest winds 15 to 25 knots. showers with a
chance of thunderstorms late this morning, then a chance of
showers and thunderstorms late. 
.tonight...southwest winds 15 to 20 knots. a chance of showers in
the evening. 
.friday...southwest winds 15 to 20 knots becoming west. a chance
of showers in the morning, then showers with a chance of
thunderstorms in the afternoon. 
.friday night...west winds 15 to 20 knots diminishing to 5 to
15 knots. showers with a chance of thunderstorms in the evening,
then a chance of showers overnight. 
.saturday...west winds 10 knots or less. showers likely with a
chance of thunderstorms. 
.sunday...west winds less than 10 knots. a chance of showers. 
.monday...light and variable winds. 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
1002 am 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 low over southern ontario this 
morning will track to southern quebec this afternoon, deepening to 
29.1 inches. the trailing cold front will move across the lake 
today. this low will 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 29.7 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.


loz062-182100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt thu jun 18 2026

.rest of today...southwest winds 20 to 25 knots becoming west. a
chance of showers. waves 5 to 8 feet. waves occasionally around
10 feet. 
.tonight...west winds 15 to 25 knots. waves 5 to 8 feet subsiding
to 3 to 6 feet. waves occasionally around 10 feet. 
.friday...west winds 15 to 25 knots. waves 3 to 6 feet. 
.friday night...west winds 15 to 20 knots. waves 3 to 6 feet
subsiding to 2 to 4 feet. 
.saturday...west winds 15 to 20 knots diminishing to 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.sunday...west winds 10 knots or less becoming east. a chance of
showers sunday night. waves 1 foot or less. 
.monday...northeast winds 5 to 15 knots becoming northwest. a
chance of showers during the day. waves 2 feet or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am 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 low over southern ontario this 
morning will track to southern quebec this afternoon, deepening to 
29.1 inches. the trailing cold front will move across the lake 
today. this low will 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 29.7 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>065-182100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt thu jun 18 2026

.rest of today...southwest winds to 30 knots becoming west.
showers likely with a chance of thunderstorms late this morning,
then a chance of showers this afternoon. waves 5 to 9 feet. waves
occasionally around 11 feet. 
.tonight...west winds to 30 knots. waves 6 to 9 feet. waves
occasionally around 11 feet. 
.friday...west winds 20 to 25 knots. waves 6 to 9 feet. waves
occasionally around 11 feet. 
.friday night...west winds 15 to 25 knots. waves 5 to 9 feet
subsiding to 4 to 7 feet. waves occasionally around 11 feet. 
.saturday...west winds 15 to 20 knots diminishing to 5 to
10 knots. waves 4 to 7 feet subsiding to 1 to 3 feet. waves
occasionally around 9 feet. 
.sunday...west winds 10 knots or less becoming south. a chance of
showers sunday night. waves 2 feet or less. 
.monday...east winds 5 to 10 knots becoming northwest. a chance
of showers. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$