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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt mon jul 20 2026


slz022-024-210900-
saint lawrence river from cape vincent to saint regis
1003 pm edt mon jul 20 2026

.overnight...south winds 10 knots or less increasing to
10 to 15 knots. mostly cloudy. 
.tuesday...south winds 10 to 15 knots. a chance of showers late
in the morning. showers with thunderstorms likely in the
afternoon. some thunderstorms may produce gusty winds in the
afternoon. 
.tuesday night...south winds 5 to 15 knots becoming southwest.
showers with a chance of thunderstorms in the evening, then
showers overnight. 
.wednesday...southwest winds 10 to 15 knots becoming west 15 to
20 knots. a chance of showers in the morning, then showers likely
in the afternoon. 
.wednesday night...west winds 5 to 15 knots. showers likely in
the evening. 
.thursday...southwest winds 10 knots or less. becoming mainly
clear. 
.friday...southwest winds less than 10 knots. mainly clear, then
becoming partly cloudy. 
.saturday...southwest winds less than 10 knots becoming south.
mainly clear, then becoming partly cloudy. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt mon jul 20 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 30.0 inch area of high pressure will build across the great lakes 
this evening, followed by a warm front crossing the lake late 
tonight and another cold front tuesday night, with these fronts 
attached to a 29.4 inch area of low pressure near james bay. a 
secondary cold front will cross the lake wednesday, with a 30.1 inch 
high building across the lower great lakes region wednesday night 
through friday.


loz062-210900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt mon jul 20 2026

.overnight...south winds 5 to 15 knots. waves 1 to 2 feet. 
.tuesday...south winds 15 to 25 knots becoming southwest. showers
with a chance of thunderstorms in the morning, then showers with
thunderstorms likely in the afternoon. some thunderstorms may
produce gusty winds in the afternoon. waves 1 to 3 feet building
to 3 to 6 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming west.
showers with thunderstorms likely in the evening, then a chance
of showers overnight. some thunderstorms may produce gusty winds
in the evening. waves 3 to 5 feet. 
.wednesday...west winds 15 to 25 knots. waves 3 to 6 feet
building to 4 to 7 feet. waves occasionally around 9 feet. 
.wednesday night...northwest winds 15 to 25 knots becoming west
and diminishing to 10 to 15 knots. waves 4 to 7 feet subsiding to
2 to 4 feet. waves occasionally around 9 feet. 
.thursday...west winds 5 to 15 knots becoming southwest. waves
1 to 3 feet subsiding to 1 foot or less. 
.friday...southwest winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...southwest winds 10 knots or less. 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
1002 pm edt mon jul 20 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 30.0 inch area of high pressure will build across the great lakes 
this evening, followed by a warm front crossing the lake late 
tonight and another cold front tuesday night, with these fronts 
attached to a 29.4 inch area of low pressure near james bay. a 
secondary cold front will cross the lake wednesday, with a 30.1 inch 
high building across the lower great lakes region wednesday night 
through friday.


loz063>065-210900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt mon jul 20 2026

.overnight...southeast winds 5 to 15 knots becoming south
15 to 20 knots. waves 2 feet or less building to 2 to 4 feet. 
.tuesday...south winds 15 to 20 knots becoming southwest. a
chance of showers and thunderstorms late in the morning. showers
with thunderstorms likely in the afternoon. some thunderstorms
may produce gusty winds in the afternoon. waves 2 to 4 feet
building to 3 to 5 feet. 
.tuesday night...south winds 15 to 20 knots becoming west.
showers likely with a chance of thunderstorms in the evening,
then showers likely overnight. some thunderstorms may produce
gusty winds in the evening. waves 2 to 4 feet building to 3 to
6 feet. 
.wednesday...west winds 20 to 25 knots. a chance of showers in
the morning. waves 5 to 8 feet building to 6 to 9 feet. waves
occasionally around 11 feet. 
.wednesday night...west winds 15 to 25 knots becoming northwest.
waves 5 to 9 feet subsiding to 3 to 6 feet. waves occasionally
around 11 feet. 
.thursday...west winds 15 to 20 knots becoming southwest 5 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.friday...southwest winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...south winds 10 knots or less. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$