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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt wed sep 2 2026


slz022-024-030900-
saint lawrence river from cape vincent to saint regis
1003 pm edt wed sep 2 2026

.rest of tonight...southwest winds 5 to 10 knots. thunderstorms
likely with a chance of showers late this evening, then showers
with a chance of thunderstorms after midnight. a chance of
showers late. some thunderstorms may produce strong winds late
this evening. 
.thursday...west winds 10 knots or less. partly to mostly sunny. 
.thursday night...west winds less than 10 knots. mainly clear in
the evening, then becoming partly cloudy. 
.friday...light and variable winds becoming northwest 5 to
10 knots. mostly sunny. 
.friday night...northwest winds less than 10 knots. partly
cloudy. 
.saturday...north winds 10 knots or less becoming northeast.
becoming mainly clear. 
.sunday...northeast winds less than 10 knots. mainly clear. 
.monday...light and variable winds. a chance of showers monday
night. 

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 wed sep 2 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 29.7 inch low continues to move eastward across 
northern quebec and allows a cold front to sweep eastward across 
lake ontario tonight. behind the front, an extensive high pressure 
ridge averaging 30.1 inches builds from northern ontario and 
vicinity through this monday.


loz063>065-030900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt wed sep 2 2026

...tornado watch 645 in effect until 11 pm edt this evening...

.rest of tonight...southwest winds 10 to 15 knots becoming west.
thunderstorms likely with a chance of showers late this evening,
then showers with a chance of thunderstorms after midnight. a
chance of showers late. some thunderstorms may produce strong
winds late this evening. waves 1 to 2 feet. 
.thursday...west winds 5 to 10 knots. a chance of showers early.
waves 1 to 2 feet. 
.thursday night...west winds 5 to 10 knots becoming northwest.
waves 1 to 2 feet. 
.friday...northwest winds 10 knots or less becoming west. waves
1 foot or less. 
.friday night...west winds 5 to 10 knots becoming north. waves
1 to 2 feet. 
.saturday...north winds 5 to 10 knots becoming northeast. waves
2 feet or less. 
.sunday...northeast winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.monday...south winds 10 knots or less becoming southwest 10 to
15 knots. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$