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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1004 pm edt fri jul 17 2026


slz022-024-180900-
saint lawrence river from cape vincent to saint regis
1004 pm edt fri jul 17 2026

.rest of tonight...south winds 10 knots or less. areas of smoke
late this evening. a chance of showers late. 
.saturday...south winds 10 to 15 knots becoming southwest.
showers likely early, then a chance of showers late in the
morning. showers with thunderstorms likely in the afternoon. some
thunderstorms may produce gusty winds in the afternoon. 
.saturday night...southwest winds 5 to 15 knots becoming
northwest. showers with a chance of thunderstorms in the evening.
some thunderstorms may produce gusty winds in the evening. 
.sunday...northwest winds 5 to 10 knots. sunny.
.sunday night...northwest winds 5 to 10 knots becoming light and
variable. mainly clear in the evening, then becoming partly
cloudy. 
.monday...southwest winds 5 to 15 knots becoming south. partly to
mostly cloudy. 
.tuesday...south winds 5 to 15 knots becoming southwest. showers
with a chance of thunderstorms. 
.wednesday...southwest winds 5 to 10 knots. 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
1003 pm edt fri jul 17 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 ridge of high pressure will slide east of the lake this 
evening to the atlantic shoreline and in its wake a warm front will 
lift northeastward across the lake tonight through tomorrow morning. 
following this warm front a cold front will slice across the lake 
saturday afternoon and evening with this front attached to a 29.4 
inch area of low pressure crossing southern canada. a 30.0 inch area 
of high pressure will build across the great lakes region from west 
to east sunday into monday, followed by another cold front tuesday 
night with this front attached to a 29.5 inch area of low pressure 
near james bay. a secondary cold front will cross the lake 
wednesday.


loz062-180900-
lake ontario open waters from the niagara river to hamlin beach-
1003 pm edt fri jul 17 2026

.rest of tonight...southeast winds 5 to 10 knots becoming south.
smoke. waves 1 foot or less. 
.saturday...southwest winds 15 to 20 knots becoming west. showers
likely early, then a chance of showers and thunderstorms late in
the morning. showers with a chance of thunderstorms in the
afternoon. some thunderstorms may produce gusty winds in the
afternoon. waves 1 to 3 feet building to 3 to 6 feet. 
.saturday night...west winds 15 to 20 knots becoming north.
showers likely in the evening. waves 3 to 5 feet. 
.sunday...north winds 5 to 15 knots becoming west. waves 1 to
3 feet. 
.sunday night...west winds 10 knots or less becoming southwest.
waves 1 foot or less. 
.monday...southwest winds 5 to 15 knots becoming south 15 to
20 knots. showers likely monday night. waves 1 to 3 feet. 
.tuesday...south winds 15 to 25 knots becoming west. showers with
a chance of thunderstorms. waves 3 to 5 feet. 
.wednesday...west winds 15 to 20 knots. a chance of showers
during the day. waves 3 to 6 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1003 pm edt fri jul 17 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 ridge of high pressure will slide east of the lake this 
evening to the atlantic shoreline and in its wake a warm front will 
lift northeastward across the lake tonight through tomorrow morning. 
following this warm front a cold front will slice across the lake 
saturday afternoon and evening with this front attached to a 29.4 
inch area of low pressure crossing southern canada. a 30.0 inch area 
of high pressure will build across the great lakes region from west 
to east sunday into monday, followed by another cold front tuesday 
night with this front attached to a 29.5 inch area of low pressure 
near james bay. a secondary cold front will cross the lake 
wednesday.


loz063>065-180900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 pm edt fri jul 17 2026

.rest of tonight...southeast winds 5 to 15 knots becoming south
15 to 20 knots. areas of smoke late this evening. waves 1 foot or
less building to 1 to 3 feet. 
.saturday...south winds 15 to 25 knots becoming west. showers in
the morning, then showers with a chance of thunderstorms in the
afternoon. some thunderstorms may produce gusty winds in the
afternoon. waves 2 to 4 feet building to 3 to 6 feet. 
.saturday night...west winds 15 to 25 knots becoming northwest.
showers with a chance of thunderstorms in the evening. some
thunderstorms may produce gusty winds in the evening. waves 3 to
6 feet building to 4 to 7 feet, then subsiding to 3 to 6 feet.
waves occasionally around 9 feet. 
.sunday...northwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.sunday night...west winds 5 to 15 knots. waves 1 to 3 feet. 
.monday...southwest winds 5 to 15 knots becoming south 15 to
20 knots. a chance of showers monday night. waves 2 feet or less
building to 2 to 4 feet. 
.tuesday...south winds 15 to 25 knots becoming west. showers with
a chance of thunderstorms. waves 3 to 5 feet building to 3 to
6 feet. 
.wednesday...west winds 15 to 25 knots. showers likely during the
day, then a chance of showers wednesday night. waves 4 to 7 feet
subsiding to 3 to 6 feet. waves occasionally around 9 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake erie
national weather service cleveland oh
918 pm edt fri jul 17 2026

for waters beyond five nautical miles of shore on lake erie

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...
low pressure 29.60 inches will move into the northern great lakes 
tonight and will reach new england by saturday evening while 
deepening to 29.50 inches. this will lift a warm front across lake 
erie tonight before a strong cold front drops across the lake 
saturday night. high pressure 30.00 inches will build across the 
great lakes sunday and monday before another cold front crosses 
tuesday. a trough averaging 29.80 inches will linger over lake erie 
wednesday.


lez061-166>169-180815-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
avon point to willowick oh beyond 5 nm off shoreline to us-
canadian border-willowick to geneva-on-the-
lake oh beyond 5nm off shoreline to us-canadian border-geneva-on-
the-lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
918 pm edt fri jul 17 2026

...dense smoke advisory in effect until midnight edt tonight...

.rest of tonight...southeast winds 5 to 15 knots becoming
southwest 15 to 20 knots. areas of smoke late this evening, then
smoke after midnight. a chance of showers with a slight chance of
thunderstorms after midnight. a chance of showers and
thunderstorms late. waves 1 to 3 feet. 
.saturday...southwest winds 15 to 25 knots becoming west. smoke
early. a chance of showers with a slight chance of thunderstorms
in the morning, then a chance of showers and thunderstorms early
in the afternoon. showers and thunderstorms late. waves 3 to
6 feet building to 4 to 7 feet. waves occasionally around 9 feet.
.saturday night...west winds 15 to 20 knots becoming north.
showers likely with a chance of thunderstorms in the evening.
waves 3 to 6 feet. 
.sunday...north winds 5 to 15 knots. waves 2 to 4 feet subsiding
to 1 to 3 feet. 
.sunday night...west winds 10 knots or less becoming south. waves
1 foot or less. 
.monday...south winds 5 to 15 knots increasing to 15 to 20 knots.
showers likely with a chance of thunderstorms monday night. waves
1 foot or less building to 3 to 6 feet. 
.tuesday...southwest winds 15 to 25 knots becoming northwest.
showers with a chance of thunderstorms during the day, then a
chance of showers and thunderstorms tuesday night. waves 4 to
7 feet subsiding to 3 to 6 feet. waves occasionally around
9 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. a chance of showers during the day. waves 3 to 6 feet
subsiding to 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$