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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm est sun nov 30 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 29.7 inch surface low near the ontario/quebec border 
will track towards eastern quebec and the canadian maritimes 
overnight. a 30.4 inch surface high centered over the central plains 
will then build east across the great lakes monday, sliding quickly 
to new england on tuesday. a 29.6 inch surface low off the carolina 
coastline tuesday morning will deepen to 28.9 inches over southern 
atlantic canada by early wednesday morning before going out to sea. 
a 30.2 inch surface high will build across the ohio valley and lower 
great lakes later wednesday into thursday morning before pushing off 
the coast. a large 29.2 inch surface low near hudson bay will push 
its cold front across the lake on thursday, with another 30.4 inch 
high building in its wake thursday night. the high will then quickly 
move east of the lake friday.


loz064-065-011000-
lake ontario open waters from sodus bay to the saint lawrence
river-
1002 pm est sun nov 30 2025

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

.rest of tonight...west winds to 30 knots becoming northwest.
lake effect rain showers with a chance of lake effect snow
showers late this evening, then a chance of rain and snow showers
after midnight. waves 10 to 15 feet. waves occasionally around
19 feet. 
.monday...northwest winds 15 to 20 knots becoming west and
diminishing to 5 to 10 knots. waves 6 to 9 feet subsiding to
2 feet or less. waves occasionally around 11 feet. 
.monday night...southwest winds 10 knots or less becoming south
10 to 15 knots. snow overnight. waves 1 to 3 feet. 
.tuesday...southeast winds 5 to 15 knots becoming north. snow.
waves 1 to 3 feet subsiding to 1 foot or less. 
.tuesday night...north winds 5 to 15 knots becoming northwest. a
chance of snow showers. waves 2 feet or less. 
.wednesday...southwest winds 15 to 20 knots increasing to
30 knots. a chance of snow showers during the day, then snow
showers with a chance of rain showers wednesday night. waves 3 to
5 feet building to 7 to 11 feet. waves occasionally around
14 feet. 
.thursday...northwest winds to 30 knots diminishing to 15 to
20 knots. snow showers during the day, then a chance of snow
showers thursday night. waves 7 to 11 feet subsiding to 4 to
7 feet. waves occasionally around 14 feet. 
.friday...southwest winds 15 to 25 knots becoming south. a chance
of snow showers during the day, then snow showers likely friday
night. waves 3 to 6 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm est sun nov 30 2025


slz022-011000-
saint lawrence river from cape vincent to ogdensburg-
1002 pm est sun nov 30 2025

...small craft advisory in effect until 4 am est monday...

.rest of tonight...southwest winds 15 to 20 knots becoming
northwest 10 to 15 knots. lake effect rain showers and lake
effect snow late this evening, then a chance of snow and rain
showers after midnight. 
.monday...northwest winds 5 to 15 knots becoming southwest less
than 10 knots. becoming mostly sunny. 
.monday night...light and variable winds becoming south 5 to
10 knots. a chance of snow showers overnight. 
.tuesday...southeast winds 10 knots or less becoming northeast.
snow likely. 
.tuesday night...north winds less than 10 knots. mostly cloudy. 
.wednesday...south winds 5 to 10 knots becoming southwest and
increasing to 15 to 20 knots. snow showers. 
.thursday...west winds 10 to 15 knots diminishing to less than
10 knots. snow showers during the day, then a chance of snow
showers thursday night. 
.friday...south winds 5 to 10 knots. a chance of snow showers. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm est sun nov 30 2025


slz024-011000-
saint lawrence river from ogdensburg to saint regis-
1002 pm est sun nov 30 2025

.rest of tonight...southwest winds 10 to 15 knots becoming
northwest 15 to 20 knots. lake effect snow late this evening,
then a chance of snow showers after midnight. 
.monday...northwest winds 5 to 15 knots becoming west less than
10 knots. partly sunny early, then becoming mostly sunny. 
.monday night...light and variable winds. a chance of snow
showers overnight. 
.tuesday...south winds less than 10 knots becoming northeast.
snow likely in the morning, then a chance of snow showers in the
afternoon. 
.tuesday night...light and variable winds. mostly cloudy. 
.wednesday...southwest winds 5 to 10 knots increasing to 15 to
20 knots. snow showers. 
.thursday...west winds 15 to 20 knots diminishing to 5 to
15 knots. snow showers during the day. 
.friday...southwest winds 5 to 10 knots becoming south. a chance
of snow showers. 

$$