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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt tue jun 30 2026


slz022-024-010900-
saint lawrence river from cape vincent to saint regis
1003 pm edt tue jun 30 2026

.overnight...southwest winds 10 knots or less. a chance of
showers and thunderstorms. 
.wednesday...southwest winds 5 to 10 knots. partly to mostly
sunny. 
.wednesday night...southwest winds 10 knots or less. partly
cloudy. 
.thursday...southwest winds 5 to 15 knots. showers likely with a
chance of thunderstorms in the afternoon. 
.thursday night...southwest winds 5 to 15 knots diminishing to
less than 10 knots. showers likely with a chance of thunderstorms
in the evening, then a chance of showers overnight. 
.friday...southwest winds 10 knots or less. a chance of showers. 
.saturday...west winds less than 10 knots. a chance of showers
and thunderstorms. 
.sunday...light and variable winds. a chance of showers sunday
night. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt tue jun 30 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 will build into the ohio valley and mid 
atlantic tonight and wednesday, where it will remain through at 
least thursday. a weak 29.9 inch trough will then approach and cross 
the lake friday into saturday.


loz063>065-010900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt tue jun 30 2026

.overnight...south winds 5 to 10 knots becoming southwest.
waves 2 feet or less. 
.wednesday...southwest winds 5 to 15 knots becoming west. waves
2 feet or less. 
.wednesday night...southwest winds 5 to 15 knots. a chance of
showers and thunderstorms in the evening. waves 1 to 3 feet. 
.thursday...southwest winds 5 to 15 knots becoming west. waves
1 to 3 feet. 
.thursday night...southwest winds 5 to 15 knots becoming west.
waves 1 to 3 feet. 
.friday...west winds 5 to 15 knots. a chance of showers and
thunderstorms friday night. waves 1 to 3 feet. 
.saturday...west winds 10 knots or less becoming north. a chance
of showers and thunderstorms. waves 1 foot or less. 
.sunday...northeast winds less than 10 knots becoming north. a
chance of showers sunday night. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$