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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm edt sat jun 20 2026


slz022-024-210900-
saint lawrence river from cape vincent to saint regis
1002 pm edt sat jun 20 2026

.overnight...west winds less than 10 knots. a chance of
showers. 
.sunday...west winds 10 knots or less. a chance of showers in the
morning, then a chance of showers and thunderstorms in the
afternoon. 
.sunday night...southwest winds less than 10 knots. a chance of
showers in the evening. 
.monday...light and variable winds. mostly cloudy. 
.monday night...south winds less than 10 knots. mostly cloudy. 
.tuesday...north winds less than 10 knots. partly cloudy. 
.wednesday...light and variable winds. partly to mostly cloudy. 
.thursday...south winds less than 10 knots. showers likely 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 sat jun 20 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 over the canadian 
maritimes will finally exit eastward into the northern atlantic 
tonight. a weak ridge of high pressure averaging 29.9 inches will 
then build over the great lakes tonight 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 tuesday and wednesday, 
before exiting east into new england on thursday as a weak 29.8 inch 
low moves east into the central great lakes.


loz062-210900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt sat jun 20 2026

.overnight...northwest winds 10 knots or less. waves 2 feet
or less. 
.sunday...west winds 5 to 10 knots becoming southwest. waves
1 foot or less. 
.sunday night...west winds less than 10 knots becoming southeast.
waves 1 foot or less. 
.monday...east winds 10 knots or less increasing to 10 to
15 knots. a chance of showers. waves 2 feet or less. 
.monday night...east winds 5 to 15 knots becoming north. a chance
of showers in the evening. waves 1 to 2 feet. 
.tuesday...northwest winds 5 to 10 knots. waves 1 foot or less. 
.wednesday...west winds less than 10 knots becoming south. a
chance of showers wednesday night. waves 1 foot or less. 
.thursday...east winds 10 knots or less becoming southwest. a
chance of showers. waves 1 foot or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sat jun 20 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 over the canadian 
maritimes will finally exit eastward into the northern atlantic 
tonight. a weak ridge of high pressure averaging 29.9 inches will 
then build over the great lakes tonight 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 tuesday and wednesday, 
before exiting east into new england on thursday as a weak 29.8 inch 
low moves east into the central great lakes.


loz063>065-210900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt sat jun 20 2026

.overnight...west winds 5 to 10 knots. waves 1 to 3 feet. 
.sunday...west winds 5 to 10 knots. waves 2 feet or less. 
.sunday night...west winds 10 knots or less becoming south. waves
1 foot or less. 
.monday...southeast winds 5 to 10 knots. showers likely. waves
1 foot or less. 
.monday night...east winds 5 to 10 knots becoming north. showers
likely in the evening, then a chance of showers overnight. waves
1 foot or less. 
.tuesday...northwest winds 5 to 10 knots. waves 2 feet or less. 
.wednesday...west winds 10 knots or less becoming south. a chance
of showers wednesday night. waves 1 foot or less. 
.thursday...southeast winds 10 knots or less becoming southwest.
a chance of showers during the day, then showers likely thursday
night. waves 1 foot or less. 

$$