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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est mon nov 3 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 cold front and associated showers will push east 
across the lower great lakes through early evening, this from a 28.9 
inch low near james bay. another 30.3 inch high over the mississippi 
valley will advance eastward across the ohio valley and mid-atlantic 
states tuesday. an area of low pressure will pass to the west and 
north of the lake wednesday, deepening from 29.8 inches down to 29.4 
inches through the day. following this low, another 30.3 inch 
surface high will reestablish over the lake for thursday. the 
surface high will then track east off the atlantic coast through 
friday allowing for another cold frontal passage.


loz063>065-040400-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm est mon nov 3 2025

...gale warning in effect until 4 am est tuesday...

.tonight...west gales to 35 knots becoming northwest and
diminishing to 30 knots after midnight. showers likely early,
then a chance of showers. waves 11 to 16 feet subsiding to 10 to
14 feet. waves occasionally around 20 feet. 
.tuesday...northwest winds to 30 knots becoming west. waves 8 to
12 feet. waves occasionally around 15 feet. 
.tuesday night...west winds 15 to 20 knots becoming southwest
10 to 15 knots. a chance of showers overnight. waves 6 to 9 feet
subsiding to 2 to 4 feet. waves occasionally around 11 feet. 
.wednesday...south winds 10 to 15 knots becoming southwest and
increasing to 30 knots in the afternoon. a chance of showers in
the morning, then showers in the afternoon. waves 1 to 3 feet
building to 6 to 9 feet. waves occasionally around 11 feet. 
.wednesday night...west gales to 35 knots becoming northwest and
diminishing to 30 knots overnight. showers. waves 9 to 13 feet
subsiding to 8 to 11 feet. waves occasionally around 16 feet. 
.thursday...northwest winds 15 to 25 knots becoming south 15 to
20 knots. showers likely during the day. waves 6 to 9 feet
subsiding to 1 to 3 feet. waves occasionally around 11 feet. 
.friday...south winds to 30 knots becoming west. showers. waves
5 to 8 feet. waves occasionally around 10 feet. 
.saturday...northwest winds 15 to 25 knots becoming southeast and
diminishing to 5 to 15 knots. rain showers. waves 5 to 8 feet
subsiding to 1 to 3 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
402 pm est mon nov 3 2025


slz022-040400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est mon nov 3 2025

...small craft advisory in effect until 10 pm est this evening...

.tonight...west winds 15 to 25 knots diminishing to 10 to
15 knots. rain showers likely early, then a chance of rain
showers late this evening. 
.tuesday...west winds 5 to 15 knots. sunny.
.tuesday night...west winds 10 knots or less becoming southwest.
a chance of rain showers overnight. 
.wednesday...south winds 5 to 10 knots. rain showers. 
.wednesday night...west winds 10 to 15 knots becoming northwest.
rain showers. 
.thursday...northwest winds 10 knots or less becoming south.
partly to mostly cloudy. 
.friday...south winds 10 to 15 knots becoming west. rain showers.
.saturday...northwest winds 10 knots or less becoming east. rain
showers likely during the day, then a chance of rain and snow
showers saturday night. 

$$