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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt tue oct 21 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 29.6 inch low just north of new england this morning 
will drift north across quebec through the day. meanwhile, another 
29.4 inch low will move across the upper great lakes and gradually 
consolidate with the first low through wednesday night. this low 
will then move from central quebec thursday morning to far northern 
quebec by friday. a 30.4 inch surface high will then move towards 
the lake saturday.


loz062-211500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt tue oct 21 2025

.today...south winds 10 to 15 knots becoming southwest and
increasing to 15 to 25 knots. showers likely from late morning
on. waves 1 to 3 feet building to 3 to 6 feet. 
.tonight...southwest winds 15 to 20 knots. a chance of
waterspouts. a chance of showers in the evening, then showers
likely after midnight. waves 3 to 6 feet subsiding to 2 to
4 feet. 
.wednesday...southwest winds 15 to 20 knots. a chance of
waterspouts. showers. waves 2 to 4 feet building to 3 to 5 feet. 
.wednesday night...southwest winds 15 to 20 knots becoming west.
a chance of waterspouts. showers. waves 3 to 6 feet. 
.thursday...west winds 15 to 25 knots. a chance of waterspouts.
showers. waves 4 to 7 feet subsiding to 3 to 6 feet. waves
occasionally around 9 feet. 
.friday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. a chance of waterspouts during the day. showers likely.
waves 2 to 4 feet subsiding to 1 to 2 feet. 
.saturday...west winds 10 knots or less becoming east. a chance
of showers. waves 2 feet or less. 

$$

fzus61 kbuf 210802
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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt tue oct 21 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 29.6 inch low just north of new england this morning 
will drift north across quebec through the day. meanwhile, another 
29.4 inch low will move across the upper great lakes and gradually 
consolidate with the first low through wednesday night. this low 
will then move from central quebec thursday morning to far northern 
quebec by friday. a 30.4 inch surface high will then move towards 
the lake saturday.


loz063>065-211500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt tue oct 21 2025

.today...southwest winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers this afternoon. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.tonight...southwest winds 15 to 20 knots becoming south. a
chance of waterspouts. a chance of showers through the early
overnight, then showers likely late. waves 2 to 4 feet subsiding
to 1 to 3 feet. 
.wednesday...southwest winds 15 to 25 knots. a chance of
waterspouts. showers. waves 2 to 4 feet building to 4 to 7 feet.
waves occasionally around 9 feet. 
.wednesday night...southwest winds 20 to 25 knots. a chance of
waterspouts. showers. waves 5 to 8 feet. waves occasionally
around 10 feet. 
.thursday...west winds 15 to 25 knots. a chance of waterspouts.
showers during the day, then showers with a chance of
thunderstorms thursday night. waves 5 to 8 feet subsiding to 3 to
6 feet. waves occasionally around 10 feet. 
.friday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. a chance of waterspouts during the day. showers with a
chance of thunderstorms during the day, then showers likely
friday night. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.saturday...northwest winds 10 knots or less becoming south.
showers likely during the day, then a chance of showers saturday
night. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am edt tue oct 21 2025


slz022-024-211500-
saint lawrence river from cape vincent to saint regis
402 am edt tue oct 21 2025

.today...southwest winds 5 to 15 knots becoming south. a chance
of showers early. a chance of showers late. 
.tonight...south winds 10 knots or less. a chance of showers in
the evening, then showers likely after midnight. 
.wednesday...south winds 5 to 15 knots becoming southwest.
showers.
.wednesday night...southwest winds 5 to 10 knots becoming south.
showers in the evening, then showers with a chance of
thunderstorms overnight. 
.thursday...southwest winds 10 knots or less becoming west. rain
showers with a chance of thunderstorms during the day, then rain
showers thursday night. 
.friday...west winds less than 10 knots. rain showers likely
during the day, then a chance of rain showers friday night. 
.saturday...west winds less than 10 knots. a chance of rain
showers. 

winds and waves higher in and near thunderstorms.

$$