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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 5 2026


slz022-024-051500-
saint lawrence river from cape vincent to saint regis
404 am edt wed aug 5 2026

.today...south winds 10 knots or less becoming southwest. sunny.
.tonight...south winds less than 10 knots. mainly clear early,
then becoming mostly cloudy. 
.thursday...south winds 10 knots or less becoming southwest. a
chance of showers in the morning, then a chance of showers and
thunderstorms in the afternoon. 
.thursday night...southwest winds less than 10 knots. a chance of
showers and thunderstorms in the evening. 
.friday...light and variable winds. a chance of showers and
thunderstorms during the day, then showers likely with a chance
of thunderstorms friday night. 
.saturday...southwest winds 5 to 10 knots. showers likely with a
chance of thunderstorms. 
.sunday...southwest winds 10 knots or less. a chance of showers. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt wed aug 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 high pressure ridge averaging 30.0 inches will drift 
away from the region. a trough and cold front will then ever so 
slowly approach lake ontario from the northwest through this weekend.


loz062-051500-
lake ontario open waters from the niagara river to hamlin beach-
403 am edt wed aug 5 2026

.today...light and variable winds. waves 1 foot or less. 
.tonight...east winds 10 knots or less becoming southwest. waves
1 foot or less. 
.thursday...southwest winds less than 10 knots. waves 1 foot or
less. 
.thursday night...south winds less than 10 knots becoming
northwest. waves 1 foot or less. 
.friday...light and variable winds becoming southwest 5 to
10 knots. showers likely with a chance of thunderstorms. waves
1 foot or less. 
.saturday...southwest winds 5 to 15 knots becoming west. a chance
of showers. waves 1 foot or less. 
.sunday...west winds 5 to 15 knots becoming southwest. showers
likely sunday night. waves 1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$

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expires:202608051500;;649453

open lake forecast for lake ontario
national weather service buffalo ny
403 am edt wed aug 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 high pressure ridge averaging 30.0 inches will drift 
away from the region. a trough and cold front will then ever so 
slowly approach lake ontario from the northwest through this weekend.


loz063>065-051500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt wed aug 5 2026

.today...south winds 10 knots or less becoming east. waves 2 feet
or less. 
.tonight...southeast winds 10 knots or less becoming south. waves
1 foot or less. 
.thursday...south winds 10 knots or less becoming west. a chance
of showers in the morning, then a chance of showers and
thunderstorms in the afternoon. waves 1 foot or less. 
.thursday night...south winds less than 10 knots becoming west.
waves 1 foot or less. 
.friday...southwest winds 10 knots or less becoming south.
showers likely with a chance of thunderstorms. waves 1 foot or
less. 
.saturday...southwest winds 5 to 15 knots becoming west. showers
likely with a chance of thunderstorms during the day, then a
chance of showers and thunderstorms saturday night. waves 1 foot
or less. 
.sunday...west winds 5 to 15 knots becoming southwest. a chance
of showers. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$