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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt fri oct 31 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 28.9 inch low over the mid-saint lawrence valley 
will depart across the canadian maritimes overnight and saturday 
while further deepening to 28.7 inches. in its wake, a large 30.3 
inch high will then build across the ohio valley and lower great 
lakes region through sunday, before sliding east and off the mid-
atlantic coastline on 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.


loz063>065-010900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt fri oct 31 2025

...gale warning in effect until 5 am edt saturday...

.rest of tonight...northwest gales to 35 knots diminishing to
30 knots. showers likely late this evening, then a chance of
showers after midnight. waves 7 to 10 feet. waves occasionally
around 13 feet. 
.saturday...northwest winds to 30 knots diminishing to 15 to
25 knots. waves 6 to 10 feet subsiding to 5 to 8 feet. waves
occasionally around 13 feet. 
.saturday night...northwest winds 15 to 20 knots diminishing to
5 to 15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.sunday...northwest winds 5 to 10 knots becoming west. waves
1 foot or less. 
.sunday night...southwest winds 5 to 15 knots becoming south
15 to 20 knots. waves 1 to 3 feet. 
.monday...south winds 15 to 25 knots becoming west to 30 knots.
showers. waves 3 to 6 feet building to 8 to 12 feet. waves
occasionally around 15 feet. 
.tuesday...west gales to 35 knots diminishing to 15 to 20 knots.
a chance of showers. waves 9 to 13 feet subsiding to 5 to 8 feet.
waves occasionally around 16 feet. 
.wednesday...southwest winds 10 to 15 knots becoming west and
increasing to 15 to 25 knots. showers. waves 3 to 5 feet building
to 5 to 8 feet. waves occasionally around 10 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm edt fri oct 31 2025


slz022-024-010900-
saint lawrence river from cape vincent to saint regis
1002 pm edt fri oct 31 2025

.overnight...west winds 15 to 25 knots. rain showers, then
a chance of rain showers late. 
.saturday...west winds 15 to 20 knots diminishing to 5 to
15 knots. mostly cloudy. 
.saturday night...west winds 10 knots or less. mostly cloudy. 
.sunday...west winds 10 knots or less becoming southwest. partly
to mostly sunny. 
.sunday night...southwest winds 10 knots or less becoming south.
partly cloudy. 
.monday...south winds 10 to 15 knots becoming west. rain showers.
.tuesday...west winds 5 to 15 knots. a chance of rain showers
during the day. 
.wednesday...southwest winds 5 to 10 knots becoming west. a
chance of rain showers during the day, then rain showers
wednesday night. 

$$