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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt sun aug 30 2026


slz022-024-310900-
saint lawrence river from cape vincent to saint regis
1003 pm edt sun aug 30 2026

.overnight...light and variable winds. areas of fog. 
.monday...light and variable winds. patchy fog early. a chance of
showers late. 
.monday night...light and variable winds. a chance of showers in
the evening, then showers likely overnight. 
.tuesday...northeast winds 10 knots or less. showers likely. 
.tuesday night...northeast winds less than 10 knots. showers
likely in the evening, then a chance of showers overnight. 
.wednesday...south winds 10 knots or less becoming southwest.
showers likely with a chance of thunderstorms. 
.thursday...southwest winds less than 10 knots. a chance of
showers. 
.friday...northwest winds less than 10 knots becoming north. a
chance of showers during the day. 

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 sun aug 30 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 frontal boundary north of lake ontario will settle 
south across the lake tonight, then stall just southwest of the lake 
monday. the front will then move back northeast across the lake as a 
warm front monday night through early tuesday. the frontal zone will 
continue to meander north and south over or near the lake through 
much of the week.


loz063>065-310900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt sun aug 30 2026

.overnight...west winds 10 knots or less becoming south.
waves 2 feet or less. 
.monday...southeast winds 10 knots or less. a chance of showers.
showers with a chance of thunderstorms late. waves 1 foot or
less. 
.monday night...southeast winds 10 knots or less becoming
southwest. showers likely with a chance of thunderstorms. waves
1 foot or less. 
.tuesday...southwest winds 5 to 10 knots becoming northwest. a
chance of showers. waves 1 foot or less. 
.tuesday night...east winds 10 knots or less becoming south. a
chance of showers. waves 1 foot or less. 
.wednesday...south winds 5 to 15 knots becoming west. showers
likely with a chance of thunderstorms during the day, then a
chance of showers and thunderstorms wednesday night. waves 2 feet
or less. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of showers during the day. waves 2 feet or less. 
.friday...northwest winds 5 to 10 knots becoming north. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$