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


slz022-024-240300-
saint lawrence river from cape vincent to saint regis
403 pm edt thu jul 23 2026

.tonight...southwest winds 5 to 15 knots diminishing to less than
10 knots. mainly clear. 
.friday...southwest winds 10 knots or less. sunny.
.friday night...southwest winds 5 to 10 knots becoming light and
variable. mainly clear. 
.saturday...south winds 10 knots or less becoming southwest.
sunny.
.saturday night...southwest winds less than 10 knots. partly to
mostly cloudy. 
.sunday...south winds 5 to 10 knots becoming light and variable.
a chance of showers and thunderstorms. 
.monday...southwest winds 10 knots or less becoming south.
showers likely with a chance of thunderstorms. 
.tuesday...south winds 10 knots or less becoming northwest.
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
402 pm 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>065-240300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt thu jul 23 2026

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

winds and waves higher in and near thunderstorms.

$$