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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt sat aug 29 2026


slz022-024-292100-
saint lawrence river from cape vincent to saint regis
1003 am edt sat aug 29 2026

.this afternoon...southwest winds 5 to 15 knots. sunny.
.tonight...southwest winds 5 to 10 knots. a chance of showers
late. 
.sunday...southwest winds 5 to 10 knots. a chance of showers in
the morning, then showers likely in the afternoon. 
.sunday night...southwest winds 10 knots or less becoming north.
showers likely in the evening, then a chance of showers
overnight. 
.monday...northeast winds less than 10 knots becoming east. a
chance of showers monday night. 
.tuesday...east winds less than 10 knots becoming southeast. a
chance of showers during the day, then showers likely with a
chance of thunderstorms tuesday night. 
.wednesday...south winds 10 knots or less becoming southwest.
showers likely with a chance of thunderstorms. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sat aug 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 high pressure ridge averaging 30.2 inches exits slowly 
toward new england through sunday before a weak cold front drifts 
southward across lake ontario sunday night. behind the front, a 
ridge averaging 30.1 inches builds from eastern canada through 
tuesday. that ridge should exit eastward tuesday night and allow a 
warm front to sweep northward across lake ontario. a cold front 
should sweep eastward across the lake late wednesday. behind the 
cold front, a trough averaging 29.9 inches should linger over lake 
ontario through thursday.


loz063>065-292100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt sat aug 29 2026

.this afternoon...south winds 5 to 10 knots. waves 2 feet or less.
.tonight...south winds 5 to 15 knots becoming southwest. waves
2 feet or less. 
.sunday...southwest winds 5 to 15 knots. a chance of showers in
the afternoon. waves 2 feet or less. 
.sunday night...southwest winds 10 knots or less becoming south.
a chance of showers. waves 2 feet or less. 
.monday...east winds 5 to 10 knots. a chance of showers during
the day, then showers likely monday night. waves 1 foot or less. 
.tuesday...southeast winds 5 to 10 knots becoming south. showers
likely during the day, then showers likely with a chance of
thunderstorms tuesday night. waves 1 foot or less. 
.wednesday...south winds 5 to 10 knots becoming west. showers
likely with a chance of thunderstorms during the day, then a
chance of showers and thunderstorms wednesday night. waves 2 feet
or less. 

winds and waves higher in and near thunderstorms.

$$