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


slz022-024-220300-
saint lawrence river from cape vincent to saint regis
403 pm edt sun jun 21 2026

.tonight...southwest winds 10 knots or less. a chance of showers
and thunderstorms early. 
.monday...south winds less than 10 knots. showers likely in the
afternoon. 
.monday night...northwest winds less than 10 knots. a chance of
showers in the evening. 
.tuesday...light and variable winds. mostly sunny. 
.tuesday night...northwest winds less than 10 knots. becoming
mainly clear. 
.wednesday...northwest winds less than 10 knots. mainly clear,
then becoming partly cloudy. 
.thursday...light and variable winds. a chance of showers during
the day, then showers likely thursday night. 
.friday...southwest winds 10 knots or less. showers 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
402 pm 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 30.0 inch broad area of high pressure will settle east 
of the lake tonight. in its wake 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. this low is forecasted to move north of the 
lake friday, with its associated weak cold front crossing the lake.


loz063>065-220300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt sun jun 21 2026

.tonight...west winds 5 to 10 knots becoming south. waves 2 feet
or less. 
.monday...southeast winds 5 to 15 knots becoming northeast 15 to
20 knots. a chance of showers early, then showers from late
morning on. waves 1 to 3 feet. 
.monday night...northeast winds 15 to 20 knots becoming northwest
5 to 15 knots. showers likely in the evening. waves 1 to 3 feet
subsiding to 1 foot or less. 
.tuesday...northwest winds 5 to 10 knots becoming west. waves
2 feet or less. 
.tuesday night...west winds 5 to 15 knots becoming northwest.
waves 1 to 2 feet. 
.wednesday...west winds 5 to 15 knots becoming south less than
10 knots. waves 1 foot or less. 
.thursday...south winds 10 knots or less. a chance of showers
during the day, then showers likely with a chance of
thunderstorms thursday night. waves 1 foot or less. 
.friday...southwest winds 5 to 15 knots becoming west. a chance
of showers during the day. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$