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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 29.4 inch low will cross new york state and new 
england today, and to the canadian maritimes tonight and saturday 
while steadily deepening to 28.7 inches. a large 30.3 inch surface 
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 
monday night through tuesday.


loz063>065-311500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt fri oct 31 2025

...gale warning in effect from noon edt today through late
tonight...

.today...northwest winds 15 to 25 knots becoming west and
increasing to 40 knot gales this afternoon. showers. waves 4 to
7 feet building to 12 to 16 feet. waves occasionally around
20 feet. 
.tonight...northwest gales to 35 knots diminishing to 30 knots.
showers in the evening, then a chance of showers after midnight.
waves 13 to 17 feet subsiding to 9 to 12 feet. waves occasionally
around 22 feet. 
.saturday...northwest winds to 30 knots becoming west 15 to
25 knots. a chance of showers. waves 7 to 10 feet subsiding to
3 to 6 feet. waves occasionally around 13 feet. 
.saturday night...northwest winds 15 to 20 knots diminishing to
5 to 15 knots. a chance of showers overnight. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.sunday...northwest winds 5 to 15 knots becoming south. a chance
of showers during the day. waves 1 foot or less building to 1 to
3 feet. 
.monday...south winds 15 to 25 knots becoming west to 30 knots.
showers. waves 3 to 6 feet building to 9 to 13 feet. waves
occasionally around 16 feet. 
.tuesday...west winds to 30 knots diminishing to 15 to 20 knots.
a chance of showers. waves 10 to 13 feet subsiding to 4 to
7 feet. waves occasionally around 16 feet. 

$$

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


slz022-024-311500-
saint lawrence river from cape vincent to saint regis
402 am edt fri oct 31 2025

.today...north winds 10 to 15 knots becoming west 15 to 20 knots.
patchy fog early. showers.
.tonight...west winds 15 to 25 knots. rain showers through the
early overnight, then a chance of rain showers late. 
.saturday...west winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of rain showers in the morning. 
.saturday night...west winds 5 to 10 knots becoming light and
variable. mostly cloudy. 
.sunday...west 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. 

$$