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open lake forecast for lake ontario
national weather service buffalo ny
1011 pm edt sun sep 13 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 30.2 inches slides 
eastward across the lower great lakes through monday. the ridge 
should exit eastward on tuesday and allow a warm front to sweep 
northeastward across the lake. a cold front should sweep eastward 
across the lake on wednesday and be followed by a ridge averaging 
30.1 inches and building briefly from the upper great lakes. on 
thursday, the front may shift northward to the lake, but then shift 
back south later in the day as a weak low of 30.0 inches wobbles 
eastward across the central great lakes. behind the low and front, a 
ridge averaging 30.2 inches should build from the upper midwest 
through friday.


loz063>065-140915-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1011 pm edt sun sep 13 2026

.overnight...northwest winds 15 to 25 knots. a chance of
showers late. waves 3 to 6 feet. 
.monday...north winds 15 to 20 knots becoming northwest and
diminishing to 5 to 10 knots. a chance of showers early. waves
3 to 5 feet subsiding to 1 to 3 feet. 
.monday night...northwest winds 5 to 10 knots becoming south.
waves 2 feet or less. 
.tuesday...south winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.tuesday night...south winds 15 to 25 knots. a chance of showers
overnight. waves 2 to 4 feet. 
.wednesday...southwest winds 5 to 15 knots becoming northeast
10 knots or less. a chance of showers. waves 1 to 3 feet
subsiding to 1 foot or less. 
.thursday...northeast winds 5 to 15 knots becoming north. a
chance of showers. waves 2 feet or less. 
.friday...north winds 5 to 15 knots becoming east. a chance of
showers friday night. waves 2 feet or less. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt sun sep 13 2026


slz022-024-140900-
saint lawrence river from cape vincent to saint regis
1003 pm edt sun sep 13 2026

.overnight...west winds 5 to 10 knots becoming northwest.
mostly cloudy, then becoming partly cloudy. 
.monday...northwest winds 5 to 10 knots. sunny.
.monday night...north winds less than 10 knots. mainly clear. 
.tuesday...southeast winds 10 knots or less becoming south 10 to
15 knots. partly sunny. 
.tuesday night...south winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers. 
.wednesday...southwest winds 5 to 10 knots becoming light and
variable. a chance of showers during the day. 
.thursday...northeast winds less than 10 knots becoming
northwest. a chance of showers. 
.friday...north winds less than 10 knots becoming east. a chance
of showers friday night. 

$$