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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1108 pm edt sat nov 1 2025


slz022-024-020900-
saint lawrence river from cape vincent to saint regis
1108 pm edt sat nov 1 2025

.overnight...west winds 10 knots or less. mostly cloudy. 
.sunday...west winds 10 knots or less becoming southwest.
becoming mostly sunny. 
.sunday night...southwest winds 10 knots or less becoming south
10 to 15 knots. partly cloudy. 
.monday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. showers.
.monday night...southwest winds 15 to 20 knots becoming west 5 to
15 knots. rain showers. 
.tuesday...west winds 5 to 15 knots becoming southwest. partly
cloudy. 
.wednesday...southwest winds 10 knots or less becoming west. rain
showers likely. 
.thursday...northwest winds 5 to 10 knots becoming south. a
chance of rain showers during the day. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1102 pm edt sat nov 1 2025

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 28.8 inch area of low pressure will shift from the 
gulf of saint lawrence to the northern atlantic tonight. in its 
wake, a large 30.3 inch area of high pressure will build across the 
ohio valley and lower great lakes region through sunday, before 
sliding east and off the mid-atlantic coastline monday. a cold front 
will slide east across the lake later monday and monday night, with 
another 30.3 inch high over the mississippi valley then sliding 
eastward across the ohio valley and mid-atlantic states tuesday and 
wednesday. the high will then move off the east coast friday.


loz062-020900-
lake ontario open waters from the niagara river to hamlin beach-
1102 pm edt sat nov 1 2025

.overnight...north winds 5 to 15 knots becoming west. waves
2 feet or less. 
.sunday...west winds 5 to 10 knots becoming southwest. waves
1 foot or less. 
.sunday night...southwest winds 10 to 15 knots increasing to
15 to 20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.monday...southwest winds 15 to 25 knots becoming west to
30 knots. showers. waves 3 to 6 feet building to 8 to 11 feet.
waves occasionally around 14 feet. 
.monday night...west winds to 30 knots. showers in the evening,
then a chance of showers overnight. waves 6 to 10 feet subsiding
to 5 to 8 feet. waves occasionally around 13 feet. 
.tuesday...west winds to 30 knots diminishing to 10 to 15 knots.
waves 5 to 8 feet subsiding to 2 to 4 feet. waves occasionally
around 10 feet. 
.wednesday...southwest winds 10 to 15 knots becoming northwest
15 to 20 knots. showers likely. waves 1 to 3 feet building to
3 to 5 feet. 
.thursday...northwest winds 15 to 20 knots becoming south 10 to
15 knots. a chance of showers during the day. waves 3 to 5 feet
subsiding to 1 to 2 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1102 pm edt sat nov 1 2025

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 28.8 inch area of low pressure will shift from the 
gulf of saint lawrence to the northern atlantic tonight. in its 
wake, a large 30.3 inch area of high pressure will build across the 
ohio valley and lower great lakes region through sunday, before 
sliding east and off the mid-atlantic coastline monday. a cold front 
will slide east across the lake later monday and monday night, with 
another 30.3 inch high over the mississippi valley then sliding 
eastward across the ohio valley and mid-atlantic states tuesday and 
wednesday. the high will then move off the east coast friday.


loz063>065-020900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1102 pm edt sat nov 1 2025

.overnight...northwest winds 5 to 15 knots. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.sunday...west winds 5 to 10 knots becoming southwest. waves
1 foot or less. 
.sunday night...southwest winds 5 to 15 knots becoming south
15 to 20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.monday...southwest winds 15 to 20 knots increasing to 30 knots.
a chance of showers in the morning, then showers in the
afternoon. waves 3 to 5 feet building to 7 to 11 feet. waves
occasionally around 14 feet. 
.monday night...west winds to 30 knots. showers. waves 8 to
12 feet. waves occasionally around 15 feet. 
.tuesday...west winds to 30 knots diminishing to 15 to 25 knots.
a chance of showers tuesday night. waves 7 to 11 feet subsiding
to 3 to 6 feet. waves occasionally around 14 feet. 
.wednesday...southwest winds 10 to 15 knots becoming northwest
15 to 20 knots. showers likely. waves 2 to 4 feet building to
4 to 7 feet. waves occasionally around 9 feet. 
.thursday...northwest winds 15 to 20 knots becoming south 10 to
15 knots. showers likely during the day. waves 4 to 7 feet
subsiding to 1 to 3 feet. waves occasionally around 9 feet. 

$$