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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt sun jul 19 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 30.0 inch area of high pressure will build across the great lakes 
from west to east through monday, followed by a warm front crossing 
the lake monday night and another cold front tuesday night, with 
these fronts attached to a 29.4 inch area of low pressure near james 
bay. a secondary cold front will cross the lake wednesday, with a 
30.1 inch high building across the lower great lakes region 
wednesday night through friday.


loz063>065-200300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt sun jul 19 2026

.tonight...west winds 5 to 15 knots. waves 1 to 3 feet. 
.monday...southwest winds 5 to 10 knots becoming southeast. waves
2 feet or less. 
.monday night...southeast winds 5 to 10 knots becoming south and
increasing to 15 to 20 knots. waves 1 foot or less building to
2 to 4 feet. 
.tuesday...south winds 15 to 25 knots. showers with a chance of
thunderstorms. waves 3 to 5 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming west.
showers with a chance of thunderstorms. waves 2 to 4 feet
building to 3 to 5 feet. 
.wednesday...west winds 15 to 25 knots becoming northwest.
showers likely with a chance of thunderstorms during the day.
waves 5 to 8 feet subsiding to 3 to 6 feet. waves occasionally
around 10 feet. 
.thursday...west winds 5 to 15 knots becoming southwest. waves
2 to 4 feet subsiding to 1 foot or less. 
.friday...southwest winds 5 to 10 knots becoming northwest. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1004 am edt sun jul 19 2026


slz022-024-192100-
saint lawrence river from cape vincent to saint regis
1004 am edt sun jul 19 2026

.this afternoon...northwest winds 5 to 15 knots. sunny.
.tonight...west winds 5 to 10 knots becoming light and variable.
becoming mainly clear. 
.monday...light and variable winds becoming southwest 5 to
10 knots. sunny.
.monday night...southwest winds 10 knots or less becoming south
10 to 15 knots. mostly cloudy. 
.tuesday...south winds 10 to 15 knots. showers with a chance of
thunderstorms. 
.wednesday...west winds 5 to 15 knots. showers likely during the
day, then a chance of showers wednesday night. 
.thursday...west winds 5 to 10 knots becoming light and variable.
mainly clear. 

winds and waves higher in and near thunderstorms.

$$