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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sun jul 5 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 30.2 inch surface will build from hudson bay today to 
quebec and northern new england monday, then east of the canadian 
maritimes by tuesday. meanwhile, a weak 29.9 inch low will develop 
over ohio today and move to the mid atlantic by late monday. a 
broad 30.1 inch high is then forecast to build into the great lakes 
tuesday through wednesday, then drift off the east coast thursday.


loz063>065-051500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sun jul 5 2026

.today...northeast winds 10 knots or less. areas of fog early.
waves 1 foot or less. 
.tonight...northeast winds 5 to 15 knots becoming east. waves
2 feet or less. 
.monday...east winds 5 to 15 knots. a chance of showers. waves
1 to 3 feet. 
.monday night...east winds 10 to 15 knots. a chance of showers.
waves 1 to 3 feet. 
.tuesday...east winds 5 to 15 knots becoming southeast. a chance
of showers during the day. waves 2 feet or less. 
.wednesday...southeast winds 5 to 10 knots becoming southwest.
waves 1 foot or less. 
.thursday...southwest winds 5 to 10 knots becoming west. a chance
of showers and thunderstorms during the day, then showers likely
with a chance of thunderstorms thursday night. 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
402 am edt sun jul 5 2026


slz022-024-051500-
saint lawrence river from cape vincent to saint regis
402 am edt sun jul 5 2026

.today...light and variable winds becoming north 5 to 10 knots.
partly to mostly sunny. 
.tonight...northeast winds 10 knots or less. mostly cloudy. 
.monday...northeast winds 10 knots or less becoming east. partly
sunny. 
.monday night...east winds less than 10 knots. partly cloudy. 
.tuesday...east winds less than 10 knots. partly cloudy. 
.wednesday...southwest winds 10 knots or less. partly cloudy. 
.thursday...southwest winds 10 knots or less. showers likely. 

$$