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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt thu may 21 2026

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 large 30.4 inch area of surface high pressure will 
build across the entire great lakes region through tonight, before 
sliding east off the new england coast late friday. this surface 
high will then strengthen to 30.6 inches as it anchors over atlantic 
canada through sunday. a 29.9 inch low an attendant warm front will 
then slowly approach the lake late friday night and saturday, before 
weakening and sliding eastward sunday. a 30.1 inch high will settle 
across the region monday through tuesday. a cold front associated 
with a 29.8 inch low over new england will drop south across the 
lake on wednesday.


loz063>065-220300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt thu may 21 2026

.tonight...northwest winds 5 to 10 knots becoming northeast.
waves 1 foot or less. 
.friday...northeast winds 5 to 15 knots. waves 1 to 3 feet. 
.friday night...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.saturday...east winds 10 to 15 knots becoming southeast and
increasing to 15 to 25 knots. showers. waves 1 to 3 feet building
to 3 to 5 feet. 
.saturday night...southeast winds 15 to 25 knots. showers. waves
3 to 6 feet. 
.sunday...southeast winds 15 to 25 knots becoming south. showers
during the day, then a chance of showers sunday night. waves 3 to
6 feet subsiding to 1 to 3 feet. 
.monday...southwest winds 5 to 10 knots becoming light and
variable. a chance of showers during the day. waves 2 feet or
less. 
.tuesday...west winds 10 knots or less. waves 1 foot or less. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt thu may 21 2026


slz022-024-220300-
saint lawrence river from cape vincent to saint regis
403 pm edt thu may 21 2026

.tonight...north winds 10 knots or less becoming northeast.
mainly clear. 
.friday...east winds 10 knots or less becoming northeast. sunny.
.friday night...northeast winds 10 knots or less becoming east.
partly cloudy in the evening, then becoming mostly cloudy. 
.saturday...east winds 10 knots or less becoming southeast. a
chance of showers in the afternoon. 
.saturday night...southeast winds 5 to 10 knots. showers.
.sunday...southeast winds 5 to 10 knots becoming south. showers
during the day, then a chance of showers sunday night. 
.monday...south winds less than 10 knots. a chance of showers
during the day. 
.tuesday...southwest winds 10 knots or less. partly cloudy. 

$$