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open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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.


loz062-220300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt tue oct 21 2025

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

$$

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glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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>065-220300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt tue oct 21 2025

.tonight...southwest winds 15 to 20 knots becoming south 10 to
15 knots. a chance of showers early. showers likely late. a
chance of waterspouts late. waves 2 to 4 feet subsiding to 1 to
3 feet. 
.wednesday...southwest winds 15 to 25 knots increasing to
30 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...southwest winds 15 to 25 knots becoming west. a
chance of waterspouts. showers. waves 5 to 8 feet. waves
occasionally around 10 feet. 
.thursday night...west winds 15 to 20 knots. a chance of
waterspouts. showers. 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. waves
3 to 5 feet subsiding to 1 to 3 feet. 
.saturday...northwest winds 10 knots or less becoming northeast.
a chance of showers. waves 2 feet or less. 
.sunday...east winds 10 knots or less. a chance of showers during
the day. waves 2 feet or less. 

$$

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


slz022-024-220300-
saint lawrence river from cape vincent to saint regis
402 pm edt tue oct 21 2025

.tonight...south winds 5 to 10 knots. a chance of showers after
midnight. 
.wednesday...south winds 5 to 15 knots becoming southwest.
showers likely early, then showers from late morning on. 
.wednesday night...southwest winds 5 to 15 knots. showers.
.thursday...southwest winds 5 to 10 knots becoming west. showers.
.thursday night...west winds 10 knots or less becoming southwest.
rain showers. 
.friday...west winds less than 10 knots. rain showers during the
day, then a chance of rain showers friday night. 
.saturday...west winds less than 10 knots. a chance of rain
showers during the day. 
.sunday...north winds less than 10 knots becoming northeast.
partly cloudy. 

$$