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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1001 am edt sat sep 12 2026


slz022-024-122100-
saint lawrence river from cape vincent to saint regis
1001 am edt sat sep 12 2026

.this afternoon...south winds 10 knots or less becoming southwest.
sunny.
.tonight...south winds 5 to 10 knots becoming southwest 10 to
15 knots. showers likely from late evening on. 
.sunday...southwest winds 5 to 15 knots. a chance of showers. 
.sunday night...west winds 5 to 10 knots. a chance of showers. 
.monday...northwest winds 5 to 10 knots becoming light and
variable. mainly clear. 
.tuesday...south winds 5 to 15 knots increasing to 15 to
20 knots. a chance of showers tuesday night. 
.wednesday...southwest winds 10 knots or less becoming southeast.
a chance of showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1001 am edt sat sep 12 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 high pressure ridge averaging 30.0 inches will move 
off the east coast today. a warm front will sweep northeastward 
across the lake this evening before a cold front sweeps eastward 
across the lake on sunday. behind the cold front, a ridge averaging 
30.2 inches will slide eastward across the lower great lakes through 
monday. the ridge should exit toward new england on tuesday and 
allow a warm front to sweep northeastward across the lake. on 
wednesday, a cold front should sweep eastward across the lake and be 
followed by a ridge averaging 30.1 inches and building from the 
upper midwest.


loz063>065-122100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1001 am edt sat sep 12 2026

.this afternoon...south winds 15 to 20 knots becoming southeast
10 to 15 knots. waves 1 to 3 feet. 
.tonight...south winds 15 to 20 knots. showers likely with a
chance of thunderstorms through the early overnight, then a
chance of showers late. waves 1 to 3 feet building to 2 to
4 feet. 
.sunday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 1 to 3 feet. 
.sunday night...west winds 10 to 15 knots becoming northwest
15 to 20 knots. a chance of showers. waves 2 to 4 feet building
to 3 to 5 feet. 
.monday...north winds 15 to 20 knots becoming southeast 5 to
15 knots. waves 3 to 5 feet subsiding to 1 foot or less. 
.tuesday...south winds 15 to 25 knots. a chance of showers
tuesday night. waves 1 to 3 feet building to 2 to 4 feet. 
.wednesday...southwest winds 5 to 15 knots becoming southeast
10 knots or less. a chance of showers. waves 1 to 3 feet
subsiding to 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$