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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
420 am edt wed sep 9 2026


slz022-024-091500-
saint lawrence river from cape vincent to saint regis
420 am edt wed sep 9 2026

.today...southeast winds 5 to 15 knots becoming south. a chance
of showers late this morning. showers early this afternoon, then
showers with a chance of thunderstorms late. 
.tonight...south winds 15 to 20 knots becoming southwest 10 to
15 knots. showers with a chance of thunderstorms in the evening. 
.thursday...west winds 10 to 15 knots. mostly sunny. 
.thursday night...northwest winds 10 knots or less. partly cloudy
in the evening, then becoming mainly clear. 
.friday...west winds 10 knots or less becoming south. mainly
clear. 
.saturday...south winds 5 to 15 knots. mainly clear, then
becoming partly cloudy. 
.sunday...southwest winds 10 knots or less becoming west. a
chance of showers. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
420 am edt wed sep 9 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 30.2 inch ridge of high pressure over the east coast 
will move further east today. a cold front will cross the lake while 
averaging 29.8 inches tonight. behind the cold front, another ridge 
averaging 30.0 inches should build from the western great lakes 
through friday and then exit toward new england on saturday. a warm 
front should sweep northeastward across lake ontario saturday night 
and be followed by a cold front sweeping eastward across the lake 
later on sunday.


loz063>065-091500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
420 am edt wed sep 9 2026

.today...south winds 15 to 20 knots. showers likely this morning,
then showers with a chance of thunderstorms this afternoon. waves
1 to 3 feet building to 2 to 4 feet. 
.tonight...southwest winds 15 to 25 knots becoming west. showers
with a chance of thunderstorms in the evening, then a chance of
showers after midnight. waves 2 to 4 feet building to 3 to
5 feet. 
.thursday...west winds 15 to 20 knots. waves 3 to 6 feet. 
.thursday night...northwest winds 15 to 20 knots diminishing to
10 to 15 knots. waves 3 to 6 feet subsiding to 2 to 4 feet. 
.friday...northwest winds 5 to 10 knots becoming south. waves
2 feet or less. 
.saturday...south winds 5 to 15 knots increasing to 15 to
20 knots. a chance of showers saturday night. waves 1 to 3 feet. 
.sunday...southwest winds 5 to 15 knots becoming northwest. a
chance of showers. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$