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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt sat jul 25 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 high will linger just off the new 
england coast today, before slowly weakening while drifting to the 
gulf of saint lawrence sunday. a 29.5 inch area of low pressure will 
develop over the western great lakes sunday night into monday, 
before strengthening to 29.3 inches while moving southeast into the 
lower great lakes region monday night and tuesday. a cold front 
associated with this low will swing across the lake late tuesday and 
tuesday night. the low will then weaken to 29.6 inches while 
drifting east into new england by wednesday.


loz063>065-251500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt sat jul 25 2026

.today...south winds 5 to 15 knots becoming east less than
10 knots. waves 2 feet or less. 
.tonight...east winds 10 knots or less becoming south. waves
1 foot or less. 
.sunday...south winds 10 knots or less. waves 1 foot or less. 
.sunday night...south winds 10 knots or less becoming southwest.
a chance of showers. waves 1 foot or less. 
.monday...south winds 5 to 10 knots. a chance of showers and
thunderstorms during the day, then showers with a chance of
thunderstorms monday night. waves 1 foot or less. 
.tuesday...south winds 5 to 15 knots becoming northwest 15 to
20 knots. showers with a chance of thunderstorms. waves 1 to
3 feet. 
.wednesday...north winds 15 to 20 knots diminishing to around
10 knots. a chance of showers. waves 2 to 4 feet subsiding to
1 to 2 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
403 am edt sat jul 25 2026


slz022-024-251500-
saint lawrence river from cape vincent to saint regis
403 am edt sat jul 25 2026

.today...south winds less than 10 knots becoming southwest.
sunny.
.tonight...southwest winds less than 10 knots. partly cloudy
early, then becoming mostly cloudy. 
.sunday...south winds less than 10 knots becoming southwest. a
chance of showers and thunderstorms in the afternoon. 
.sunday night...southwest winds less than 10 knots. partly
cloudy. 
.monday...south winds 10 knots or less. showers with a chance of
thunderstorms. 
.tuesday...southeast winds 10 knots or less becoming north.
showers with a chance of thunderstorms. 
.wednesday...north winds 10 knots or less. showers likely with a
chance of thunderstorms. 

winds and waves higher in and near thunderstorms.

$$