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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am edt sat aug 15 2026


slz022-024-152100-
saint lawrence river from cape vincent to saint regis
1002 am edt sat aug 15 2026

.this afternoon...northeast winds less than 10 knots becoming
north. mostly sunny. 
.tonight...northeast winds less than 10 knots. partly cloudy. 
.sunday...southeast winds less than 10 knots. showers likely in
the afternoon. 
.sunday night...east winds 10 knots or less becoming west.
showers.
.monday...northwest winds less than 10 knots. a chance of showers
during the day. 
.tuesday...light and variable winds. mainly clear, then becoming
partly cloudy. 
.wednesday...south winds 5 to 10 knots becoming west. a chance of
showers during the day, then showers likely wednesday night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sat aug 15 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 30.2 inch ridge will impact lake ontario today before the ridge 
begins to exit eastward tonight. a 29.7 inch low will move southeast 
from the northern great lakes to southern new england tonight 
through monday. a warm front will drift northeast across lake 
ontario late sunday before a cold front sweeps east across the lake 
sunday night. behind the cold front, a trough averaging 29.8 inches 
should linger over lake ontario monday. a 30.o inch high should 
build from the upper midwest monday night and traverse lake ontario 
tuesday. this ridge should exit slowly eastward tuesday night 
through wednesday as a cold front approaches from the northwest.


loz063>065-152100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt sat aug 15 2026

.this afternoon...east winds 5 to 10 knots becoming northeast.
waves 1 foot or less. 
.tonight...northeast winds 5 to 15 knots becoming southeast.
waves 2 feet or less. 
.sunday...southeast winds 5 to 15 knots. showers likely with a
chance of thunderstorms in the afternoon. waves 2 feet or less. 
.sunday night...southeast winds 10 to 15 knots becoming
northwest. showers with a chance of thunderstorms in the evening,
then showers overnight. waves 2 feet or less. 
.monday...northwest winds 5 to 10 knots. a chance of showers
during the day. waves 2 feet or less. 
.tuesday...west winds 10 knots or less becoming southwest 10 to
15 knots. waves 2 feet or less. 
.wednesday...south winds 5 to 15 knots becoming west. a chance of
showers during the day, then showers likely wednesday night.
waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$