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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sat jun 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...an unseasonably strong 29.2 inch low will linger over 
the canadian maritimes through this evening before exiting eastward 
over the atlantic. a weak ridge of high pressure averaging 29.9 
inches will then build over the great lakes tonight through sunday. 
a 29.7 inch low is then forecast to move south of the lower great 
lakes monday and monday night, before moving off the new england 
coast by tuesday. a broad area of high pressure averaging 30.1 
inches will advance over the eastern great lakes region wednesday 
and thursday of next week.


loz062-201500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt sat jun 20 2026

.today...west winds 10 to 15 knots. waves 2 to 4 feet subsiding
to 1 to 3 feet. 
.tonight...west winds 5 to 10 knots. a chance of showers late.
waves 1 to 3 feet subsiding to 1 foot or less. 
.sunday...west winds 10 knots or less becoming southwest. waves
1 foot or less. 
.sunday night...southwest winds less than 10 knots becoming
southeast. a chance of showers overnight. waves 1 foot or less. 
.monday...east winds 5 to 15 knots becoming northwest. showers
likely during the day, then a chance of showers monday night.
waves 2 feet or less. 
.tuesday...northwest winds 5 to 10 knots. waves 2 feet or less. 
.wednesday...west winds less than 10 knots becoming southeast. a
chance of showers wednesday night. waves 1 foot or less. 

$$

fzus61 kbuf 200802
glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sat jun 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...an unseasonably strong 29.2 inch low will linger over 
the canadian maritimes through this evening before exiting eastward 
over the atlantic. a weak ridge of high pressure averaging 29.9 
inches will then build over the great lakes tonight through sunday. 
a 29.7 inch low is then forecast to move south of the lower great 
lakes monday and monday night, before moving off the new england 
coast by tuesday. a broad area of high pressure averaging 30.1 
inches will advance over the eastern great lakes region wednesday 
and thursday of next week.


loz063>065-201500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sat jun 20 2026

.today...west winds 15 to 20 knots. waves 3 to 6 feet. 
.tonight...west winds 5 to 15 knots. waves 2 to 4 feet subsiding
to 1 to 3 feet. 
.sunday...west winds 5 to 10 knots. waves 2 feet or less. 
.sunday night...west winds 10 knots or less becoming south. a
chance of showers overnight. waves 2 feet or less. 
.monday...southeast winds 5 to 10 knots becoming northwest.
showers likely. waves 2 feet or less. 
.tuesday...northwest winds 5 to 15 knots becoming west. waves
2 feet or less. 
.wednesday...west winds 10 knots or less becoming south. a chance
of showers wednesday night. 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
402 am edt sat jun 20 2026


slz022-024-201500-
saint lawrence river from cape vincent to saint regis
402 am edt sat jun 20 2026

.today...west winds 5 to 10 knots. showers likely with a chance
of thunderstorms this afternoon. 
.tonight...west winds 10 knots or less. showers likely with a
chance of thunderstorms early, then a chance of showers from late
evening on. 
.sunday...west winds 10 knots or less. showers likely in the
morning, then showers likely with a chance of thunderstorms in
the afternoon. 
.sunday night...southwest winds less than 10 knots. showers
likely with a chance of thunderstorms in the evening. 
.monday...light and variable winds. a chance of showers. 
.tuesday...northwest winds less than 10 knots. partly cloudy. 
.wednesday...light and variable winds. partly cloudy. 

winds and waves higher in and near thunderstorms.

$$