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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sat jun 27 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 weak 29.9 inch low will move east across the canadian 
maritimes throughout the day today. meanwhile, a 30.1 inch high will 
build into the upper great lakes today through early sunday before 
drifting east to quebec and new england by monday, then east of the 
new england coast by tuesday. another broad 30.1 inch high will 
build into the ohio valley and mid atlantic by wednesday.


loz063>065-271500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sat jun 27 2026

.today...southwest winds less than 10 knots. patchy fog early.
waves 1 foot or less. 
.tonight...north winds less than 10 knots. waves 1 foot or less. 
.sunday...light and variable winds. waves 1 foot or less. 
.sunday night...northwest winds less than 10 knots. waves 1 foot
or less. 
.monday...east winds 10 knots or less becoming southeast. a
chance of showers and thunderstorms monday night. waves 1 foot or
less. 
.tuesday...south winds 5 to 10 knots becoming southwest. a chance
of showers and thunderstorms. waves 2 feet or less. 
.wednesday...southwest winds 10 to 15 knots becoming west. a
chance of showers during the day. waves 1 to 3 feet. 

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 sat jun 27 2026


slz022-024-271500-
saint lawrence river from cape vincent to saint regis
402 am edt sat jun 27 2026

.today...light and variable winds. patchy fog early. 
.tonight...light and variable winds. partly cloudy. 
.sunday...light and variable winds. sunny.
.sunday night...light and variable winds. mainly clear. 
.monday...light and variable winds. mainly clear, then becoming
mostly cloudy. 
.tuesday...south winds 5 to 10 knots becoming southwest. a chance
of showers and thunderstorms. 
.wednesday...southwest winds 10 knots or less. a chance of
showers during the day, then a chance of showers and
thunderstorms wednesday night. 

winds and waves higher in and near thunderstorms.

$$