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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am edt sun sep 13 2026


slz022-024-132100-
saint lawrence river from cape vincent to saint regis
1002 am edt sun sep 13 2026

.this afternoon...southwest winds 5 to 10 knots. a chance of
showers early. a chance of showers and
thunderstorms late. 
.tonight...west winds 5 to 10 knots becoming northwest. a chance
of showers. 
.monday...northwest winds 5 to 10 knots. sunny.
.monday night...northwest winds less than 10 knots. mainly clear.
.tuesday...south winds 5 to 15 knots becoming southwest 15 to
20 knots. a chance of showers tuesday night. 
.wednesday...southwest winds 10 knots or less becoming northeast.
a chance of showers during the day. 
.thursday...northeast winds 10 knots or less becoming north. 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
1001 am 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 cold front moves eastward across the lake today. 
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. a cold front should sweep 
eastward across the lake on wednesday and be followed by a ridge 
averaging 30.1 inches and building from the upper midwest through 
thursday.


loz062-132100-
lake ontario open waters from the niagara river to hamlin beach-
1001 am edt sun sep 13 2026

.this afternoon...west winds 5 to 15 knots. waves 2 feet or less. 
.tonight...northwest winds 15 to 20 knots. a chance of showers
late in the evening. waves 1 to 3 feet building to 3 to 5 feet. 
.monday...north winds 5 to 15 knots becoming west less than
10 knots. waves 2 to 4 feet subsiding to 1 foot or less. 
.monday night...west winds 10 knots or less becoming south 10 to
15 knots. waves 2 feet or less. 
.tuesday...south winds 10 to 15 knots becoming southwest. showers
likely tuesday night. waves 2 feet or less. 
.wednesday...northwest winds 10 knots or less becoming northeast.
showers likely during the day. waves 2 feet or less. 
.thursday...east winds 5 to 15 knots becoming northeast. a chance
of showers. waves 1 to 2 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1001 am 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 cold front moves eastward across the lake today. 
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. a cold front should sweep 
eastward across the lake on wednesday and be followed by a ridge 
averaging 30.1 inches and building from the upper midwest through 
thursday.


loz063>065-132100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1001 am edt sun sep 13 2026

.this afternoon...southwest winds 5 to 15 knots becoming west. a
chance of showers late. waves 1 to 3 feet. 
.tonight...west winds 15 to 20 knots becoming northwest. a chance
of showers late in the evening. waves 1 to 3 feet building to
3 to 6 feet. 
.monday...north winds 15 to 20 knots becoming northwest and
diminishing to 5 to 10 knots. waves 3 to 5 feet subsiding to 1 to
3 feet. 
.monday night...northwest winds 10 knots or less becoming south
10 to 15 knots. waves 1 foot or less. 
.tuesday...south winds 15 to 25 knots. showers likely tuesday
night. waves 2 to 4 feet building to 3 to 5 feet. 
.wednesday...southwest winds 5 to 15 knots becoming northeast.
showers likely during the day, then a chance of showers wednesday
night. waves 1 to 3 feet subsiding to 1 foot or less. 
.thursday...east winds 5 to 15 knots becoming north. a chance of
showers. waves 2 feet or less. 

$$