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


slz022-024-092115-
saint lawrence river from cape vincent to saint regis
259 pm edt wed sep 9 2026

.this afternoon...south winds 10 to 15 knots. showers.
.tonight...south winds 10 to 15 knots becoming southwest. showers
in the evening, then a chance of showers after midnight. 
.thursday...west winds 10 to 15 knots. mostly sunny. 
.thursday night...northwest winds 5 to 10 knots becoming light
and variable. partly cloudy in the evening, then becoming mainly
clear. 
.friday...west winds 10 knots or less becoming south. 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. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
258 pm 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 slide east further into the atlantic today. a cold front will 
cross the lake while averaging 29.8 inches tonight. behind the cold 
front, another ridge averaging 30.0 inches will 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>065-092115-
lake ontario open waters from hamlin beach to the saint lawrence
river-
258 pm edt wed sep 9 2026

.this afternoon...south winds 15 to 20 knots. showers early
, then showers with a chance of thunderstorms late.
waves 1 to 3 feet building to 2 to 4 feet. 
.tonight...southwest winds 15 to 20 knots becoming west. showers
with a chance of thunderstorms early, then showers likely late in
the evening. 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
5 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 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet. 
.sunday...southwest winds 10 to 15 knots becoming northwest.
waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$