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open lake forecast for lake ontario
national weather service buffalo ny
1003 pm edt wed may 20 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 thursday, 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 and 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.


loz062-210900-
lake ontario open waters from the niagara river to hamlin beach-
1003 pm edt wed may 20 2026

.overnight...northwest winds 10 to 15 knots becoming
northeast 15 to 20 knots. waves 1 to 3 feet. 
.thursday...northeast winds 15 to 20 knots becoming southeast
5 to 15 knots. waves 2 to 4 feet subsiding to 1 to 2 feet. 
.thursday night...east winds 10 knots or less. waves 1 foot or
less. 
.friday...east winds 5 to 10 knots increasing to 15 to 20 knots.
waves 1 to 3 feet building to 2 to 4 feet. 
.friday night...east winds 15 to 20 knots. a chance of showers
overnight. waves 2 to 4 feet. 
.saturday...east winds 15 to 25 knots. showers. waves 5 to 8 feet
subsiding to 3 to 6 feet. waves occasionally around 10 feet. 
.sunday...southeast winds 5 to 15 knots becoming south. showers
likely during the day, then a chance of showers sunday night.
waves 2 to 4 feet subsiding to 2 feet or less. 
.monday...southwest winds 10 knots or less becoming west. a
chance of showers during the day. waves 1 foot or less. 

$$

fzus61 kbuf 210203
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open lake forecast for lake ontario
national weather service buffalo ny
1003 pm edt wed may 20 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 thursday, 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 and 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.


loz063>065-210900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 pm edt wed may 20 2026

.overnight...northwest winds 15 to 25 knots becoming
northeast. waves 2 to 4 feet building to 3 to 6 feet. 
.thursday...northeast winds 15 to 20 knots becoming west 5 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.thursday night...northwest winds 10 knots or less becoming
northeast. waves 1 foot or less. 
.friday...east winds 5 to 15 knots becoming northeast. waves
2 feet or less. 
.friday night...northeast winds 10 to 15 knots becoming east. a
chance of showers overnight. waves 1 to 3 feet. 
.saturday...east winds 15 to 25 knots becoming southeast.
showers. waves 2 to 4 feet building to 3 to 6 feet. 
.sunday...southeast winds 15 to 25 knots becoming south and
diminishing to 10 to 15 knots. showers. waves 3 to 6 feet
subsiding to 1 to 3 feet. 
.monday...south winds 5 to 15 knots becoming west. showers likely
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
1003 pm edt wed may 20 2026


slz022-024-210900-
saint lawrence river from cape vincent to saint regis
1003 pm edt wed may 20 2026

.overnight...north winds 15 to 20 knots. partly cloudy. 
.thursday...north winds 5 to 15 knots diminishing to less than
10 knots. sunny.
.thursday night...north winds less than 10 knots. mainly clear. 
.friday...light and variable winds. sunny.
.friday night...northeast winds less than 10 knots becoming east.
partly to mostly cloudy. 
.saturday...east winds 10 knots or less becoming southeast.
showers likely. 
.sunday...southeast winds 5 to 10 knots becoming south. showers
likely. 
.monday...south winds 10 knots or less becoming southwest.
showers likely during the day. 

$$