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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
502 pm edt wed jul 1 2026


slz022-024-020315-
saint lawrence river from cape vincent to saint regis
502 pm edt wed jul 1 2026

...severe thunderstorm watch 432 in effect until 11 pm edt this
evening...

.tonight...southwest winds 10 knots or less. a chance of showers
and thunderstorms early, then a chance of showers late this
evening. a chance of showers late. some thunderstorms may be
severe with strong winds and large hail. 
.thursday...southwest winds 5 to 15 knots. a chance of showers
and thunderstorms in the afternoon. 
.thursday night...southwest winds 10 knots or less. a chance of
showers and thunderstorms in the evening, then a chance of
showers overnight. 
.friday...southwest winds 10 knots or less. a chance of showers
in the afternoon. 
.friday night...southwest winds 5 to 10 knots becoming light and
variable. a chance of showers in the evening. 
.saturday...northwest winds less than 10 knots. a chance of
showers. 
.sunday...light and variable winds. a chance of showers sunday
night. 
.monday...northeast winds less than 10 knots. 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
402 pm edt wed jul 1 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 remain anchored from the ohio 
valley to the mid atlantic and extend a ridge over lake ontario 
through friday. on saturday through saturday night, a weak cold 
front will move slowly southward across lake ontario. behind the 
front, a high pressure ridge averaging 30.0 inches should build from 
the northern great lakes through monday.


loz062-020300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt wed jul 1 2026

.tonight...southwest winds 10 to 15 knots. waves 1 to 3 feet. 
.thursday...southwest winds 10 to 15 knots. 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 in the afternoon. waves 1 to 2 feet. 
.friday night...west winds 5 to 15 knots. a chance of showers and
thunderstorms in the evening, then a chance of showers overnight.
waves 2 feet or less. 
.saturday...west winds 10 knots or less becoming northeast. a
chance of showers and thunderstorms. waves 1 foot or less. 
.sunday...east winds 5 to 10 knots becoming northeast. a chance
of showers. waves 1 foot or less. 
.monday...northeast winds 10 knots or less becoming east. a
chance of showers during the day. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt wed jul 1 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 remain anchored from the ohio 
valley to the mid atlantic and extend a ridge over lake ontario 
through friday. on saturday through saturday night, a weak cold 
front will move slowly southward across lake ontario. behind the 
front, a high pressure ridge averaging 30.0 inches should build from 
the northern great lakes through monday.


loz063>065-020300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt wed jul 1 2026

.tonight...southwest winds 5 to 15 knots. a chance of showers and
thunderstorms late this evening. waves 1 to 2 feet. 
.thursday...southwest winds 5 to 15 knots becoming west. waves
1 to 3 feet. 
.thursday night...west winds 5 to 15 knots. a chance of showers
overnight. waves 1 to 3 feet. 
.friday...west winds 5 to 15 knots. a chance of showers. waves
1 to 2 feet. 
.friday night...west winds 5 to 15 knots. a chance of showers in
the evening, then a chance of showers and thunderstorms
overnight. waves 1 to 3 feet. 
.saturday...west winds 10 knots or less becoming northeast. a
chance of showers and thunderstorms. waves 2 feet or less. 
.sunday...northeast winds 10 knots or less. a chance of showers.
waves 1 foot or less. 
.monday...northeast winds 10 knots or less becoming south. a
chance of showers during the day. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$