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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt thu jul 23 2026


slz022-024-231500-
saint lawrence river from cape vincent to saint regis
403 am edt thu jul 23 2026

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

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu jul 23 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 29.3 inch low over northern quebec this morning 
will move northeast and across the north atlantic by tonight. 
meanwhile, a 30.2 inch high will build across the central great 
lakes today, and then across the lake tonight. this high will linger 
from the lower great lakes to new england friday through saturday 
before weakening and drifting off the east coast sunday. a 29.5 inch 
area of low pressure will develop over the western great lakes 
sunday night and move north of the lake monday.


loz063>065-231500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt thu jul 23 2026

.today...west winds 10 to 15 knots. waves 1 to 3 feet. 
.tonight...west winds 5 to 15 knots becoming southwest. waves
2 feet or less. 
.friday...southwest winds 10 knots or less becoming northeast.
waves 1 foot or less. 
.friday night...northeast winds 10 knots or less becoming
southeast. waves 1 foot or less. 
.saturday...south winds 5 to 15 knots diminishing to 10 knots or
less. waves 2 feet or less. 
.sunday...southwest winds 10 knots or less. a chance of showers
sunday night. waves 1 foot or less. 
.monday...southwest winds 10 knots or less becoming south. a
chance of showers during the day, then showers likely with a
chance of thunderstorms monday night. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$