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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt mon oct 20 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 over eastern new york this evening 
will move north into quebec by tonight. another 29.4 inch low will 
then move into the upper great lakes tuesday night and wednesday 
before consolidating with the low over central quebec by wednesday 
night. this low will then move to far northern quebec by friday. a 
30.4 inch surface high will then move towards the lake saturday.


loz063>065-210900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt mon oct 20 2025

.overnight...northwest winds 15 to 25 knots becoming west.
waves 7 to 10 feet subsiding to 3 to 6 feet. waves occasionally
around 13 feet. 
.tuesday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers in the afternoon. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.tuesday night...southwest winds 15 to 20 knots. showers. waves
2 to 4 feet. 
.wednesday...southwest winds 15 to 25 knots increasing to
30 knots. showers. waves 3 to 6 feet building to 5 to 8 feet.
waves occasionally around 10 feet. 
.wednesday night...southwest winds to 30 knots. a chance of
waterspouts. showers. waves 5 to 8 feet. waves occasionally
around 10 feet. 
.thursday...southwest winds to 30 knots becoming west 15 to
25 knots. a chance of waterspouts. showers. waves 6 to 10 feet
subsiding to 4 to 7 feet. waves occasionally around 13 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 6 feet subsiding to 1 to 3 feet. 
.saturday...northwest winds 5 to 10 knots becoming southeast. a
chance of showers. 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
1002 pm edt mon oct 20 2025


slz022-024-210900-
saint lawrence river from cape vincent to saint regis
1002 pm edt mon oct 20 2025

.overnight...west winds 10 to 15 knots. showers.
.tuesday...southwest winds 5 to 15 knots becoming south. showers
likely early. a chance of showers in the afternoon. 
.tuesday night...south winds 5 to 10 knots. showers.
.wednesday...south winds 5 to 15 knots becoming southwest.
showers.
.wednesday night...southwest winds 5 to 15 knots. showers.
.thursday...southwest winds 5 to 15 knots becoming west less than
10 knots. rain showers. 
.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. 

$$