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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt tue aug 18 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 ridge of high pressure averaging 30.0 inches will 
build from the central great lakes today. the ridge exits eastward 
tonight before a cold front sweeps eastward across lake ontario on 
wednesday. behind the front, a ridge averaging 30.1 inches builds 
from the western great lakes and vicinity through friday. this ridge 
should exit eastward friday night through saturday and allow a warm 
front to drift northward across lake ontario.


loz063>065-181500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt tue aug 18 2026

.today...north winds 10 knots or less becoming west. waves 1 foot
or less. 
.tonight...southwest winds 5 to 15 knots. a chance of showers
late. waves 2 feet or less. 
.wednesday...southwest winds 10 to 15 knots becoming west.
showers likely in the morning, then a chance of showers and
thunderstorms in the afternoon. waves 1 to 3 feet. 
.wednesday night...west winds 5 to 15 knots becoming northwest.
waves 1 to 3 feet. 
.thursday...northwest winds 5 to 10 knots becoming north. waves
1 foot or less. 
.friday...east winds 10 knots or less becoming southeast. waves
1 foot or less. 
.saturday...southeast winds 5 to 15 knots becoming south. a
chance of showers during the day, then showers likely saturday
night. waves 2 feet 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
402 am edt tue aug 18 2026


slz022-024-181500-
saint lawrence river from cape vincent to saint regis
402 am edt tue aug 18 2026

.today...north winds 10 knots or less becoming west. patchy fog
early. 
.tonight...southwest winds 10 knots or less. partly to mostly
cloudy. 
.wednesday...southwest winds 5 to 10 knots. showers in the
morning, then showers with a chance of thunderstorms in the
afternoon. 
.wednesday night...southwest winds 5 to 10 knots becoming light
and variable. a chance of showers in the evening. patchy fog. 
.thursday...light and variable winds. patchy fog. 
.friday...light and variable winds. patchy fog during the day. 
.saturday...southeast winds 10 knots or less. a chance of showers
during the day, then showers likely saturday night. 

winds and waves higher in and near thunderstorms.

$$