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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am edt sun jun 21 2026


slz022-024-211500-
saint lawrence river from cape vincent to saint regis
402 am edt sun jun 21 2026

.today...west winds 10 knots or less. a chance of showers this
morning, then a chance of showers and thunderstorms this
afternoon. 
.tonight...southwest winds less than 10 knots. a chance of
showers and thunderstorms early. 
.monday...light and variable winds. a chance of showers. 
.monday night...southeast winds less than 10 knots. a chance of
showers in the evening. 
.tuesday...northwest winds less than 10 knots. partly cloudy. 
.wednesday...west winds less than 10 knots. partly to mostly
cloudy. 
.thursday...south winds less than 10 knots. a chance of showers
during the day, then showers likely thursday night. 

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 sun jun 21 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...a weak ridge of high pressure averaging 29.9 inches will 
build over the great lakes through the day today. 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>065-211500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sun jun 21 2026

.today...west winds 5 to 15 knots. waves 2 feet or less. 
.tonight...west winds 10 knots or less becoming south. waves
1 foot or less. 
.monday...south winds 5 to 10 knots becoming east. showers. waves
1 foot or less. 
.monday night...northeast winds 10 knots or less becoming
northwest. showers likely in the evening. waves 1 foot or less. 
.tuesday...northwest winds 5 to 15 knots. waves 2 feet or less. 
.wednesday...west winds 10 knots or less becoming south. waves
1 foot or less. 
.thursday...southeast winds 10 knots or less becoming south. a
chance of showers during the day, then showers likely thursday
night. waves 1 foot or less. 

$$