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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt mon jun 29 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 30.1 inch high draped from quebec to eastern new york 
will slide east into new england today, then offshore by tuesday. a 
warm front will cross the lake on tuesday, then another broad 30.1 
inch high will build into the ohio valley and mid atlantic by 
wednesday, where it will remain through at least thursday. a weak 
29.9 inch trough will then approach the lake friday.


loz063>065-291500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt mon jun 29 2026

.today...light and variable winds. waves 1 foot or less. 
.tonight...northeast winds 5 to 10 knots becoming south. waves
1 foot or less. 
.tuesday...south winds 10 knots or less becoming southwest. a
chance of showers and thunderstorms. waves 1 foot or less. 
.tuesday night...south winds 5 to 10 knots becoming southwest. a
chance of showers. waves 2 feet or less. 
.wednesday...southwest winds 5 to 15 knots. waves 1 to 3 feet. 
.thursday...southwest winds 5 to 15 knots becoming west. a chance
of showers thursday night. waves 1 to 3 feet. 
.friday...west winds 5 to 15 knots. a chance of showers during
the day, then a chance of showers and thunderstorms friday 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 mon jun 29 2026


slz022-024-291500-
saint lawrence river from cape vincent to saint regis
402 am edt mon jun 29 2026

.today...light and variable winds. sunny.
.tonight...light and variable winds. mainly clear in the evening,
then becoming partly cloudy. 
.tuesday...south winds 10 knots or less becoming southwest 10 to
15 knots. a chance of showers in the morning, then showers likely
with a chance of thunderstorms in the afternoon. 
.tuesday night...southwest winds 5 to 10 knots. showers likely
with a chance of thunderstorms in the evening, then a chance of
showers and thunderstorms overnight. 
.wednesday...southwest winds 10 knots or less. a chance of
showers and thunderstorms. 
.thursday...southwest winds 10 knots or less. a chance of showers
and thunderstorms. 
.friday...southwest winds less than 10 knots. a chance of showers
and thunderstorms. 

winds and waves higher in and near thunderstorms.

$$