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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 secondary cold front will cross lake ontario tonight. a 30.0 
inch area of high pressure will build across the great lakes 
from west to east sunday into 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>065-191500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sun jul 19 2026

.today...north winds 15 to 20 knots becoming west 5 to 15 knots.
patchy smoke early. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tonight...west winds 5 to 15 knots. waves 1 to 3 feet. 
.monday...west winds 10 knots or less becoming east. waves 1 foot
or less. 
.monday night...east winds 10 knots or less becoming south and
increasing to 15 to 20 knots overnight. waves 1 foot or less
building to 2 to 4 feet. 
.tuesday...south winds 15 to 20 knots becoming west. showers with
a chance of thunderstorms. waves 3 to 5 feet. 
.wednesday...west winds 15 to 25 knots becoming northwest.
showers likely during the day. waves 5 to 8 feet subsiding to
3 to 6 feet. waves occasionally around 10 feet. 
.thursday...northwest winds 5 to 15 knots becoming southwest.
waves 2 to 4 feet subsiding to 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
403 am edt sun jul 19 2026


slz022-024-191500-
saint lawrence river from cape vincent to saint regis
403 am edt sun jul 19 2026

.today...northwest winds 5 to 10 knots. patchy smoke early. 
.tonight...west winds 5 to 10 knots becoming light and variable.
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.

$$