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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt wed aug 12 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 high will shift east of the lake this morning, before a 
trough averaging 29.7 inches moves over the lake this afternoon, 
where it will linger through thursday. a cold front then sweeps 
across the lake thursday night, with a 30.2 inch high pressure ridge 
building in from the upper great lakes on friday, settling over the 
lower great lakes region on saturday. a low averaging 29.8 inches is 
expected to approach the lake sunday.


loz063>065-121500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt wed aug 12 2026

.today...west winds 10 knots or less. a chance of showers and
thunderstorms late. waves 1 foot or less. 
.tonight...west winds 5 to 10 knots. a chance of showers and
thunderstorms in the evening. waves 1 foot or less. 
.thursday...northwest winds 10 knots or less becoming west. waves
1 foot or less. 
.thursday night...west winds 5 to 10 knots becoming north. waves
1 foot or less. 
.friday...north winds 5 to 10 knots becoming northeast. waves
1 foot or less. 
.saturday...northeast winds 10 knots or less becoming south.
waves 1 foot or less. 
.sunday...southeast winds 5 to 10 knots becoming northwest.
showers likely with a chance of thunderstorms. 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
403 am edt wed aug 12 2026


slz022-024-121500-
saint lawrence river from cape vincent to saint regis
403 am edt wed aug 12 2026

.today...light and variable winds becoming west 5 to 10 knots.
patchy fog early. a chance of showers and thunderstorms this
afternoon. 
.tonight...southwest winds less than 10 knots. a chance of
showers and thunderstorms in the evening, then a chance of
showers after midnight. patchy fog from late evening on. 
.thursday...light and variable winds becoming west 5 to 10 knots.
a chance of showers and thunderstorms in the afternoon. 
.thursday night...west winds less than 10 knots. a chance of
showers and thunderstorms in the evening. 
.friday...north winds 10 knots or less becoming northwest. a
chance of showers during the day. 
.saturday...northwest winds less than 10 knots. partly cloudy. 
.sunday...south winds less than 10 knots becoming north. a chance
of showers. 

winds and waves higher in and near thunderstorms.

$$