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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
142 pm edt sat jul 18 2026


slz022-024-182100-
saint lawrence river from cape vincent to saint regis
142 pm edt sat jul 18 2026

.this afternoon...southwest winds 15 to 20 knots diminishing to
10 to 15 knots. patchy smoke early. showers and
thunderstorms. some thunderstorms may produce gusty winds. 
.tonight...southwest winds 5 to 15 knots becoming northwest.
showers and thunderstorms early, then a chance of showers late in
the evening. some thunderstorms may produce gusty winds early. 
.sunday...northwest winds 5 to 10 knots. sunny.
.sunday night...northwest winds 5 to 10 knots becoming light and
variable. mainly clear. 
.monday...southwest winds 5 to 10 knots becoming south. partly
cloudy, then becoming mostly cloudy. 
.tuesday...south winds 10 to 15 knots. showers with a chance of
thunderstorms. 
.wednesday...southwest winds 5 to 15 knots becoming west. showers
likely during the day, then a chance of showers wednesday night. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
141 pm edt sat jul 18 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 cold front will slice across the lake this afternoon and evening, 
with this front attached to a 29.4 inch area of low pressure 
crossing southeastern 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 a warm front crossing the lake monday night 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.


loz065-182100-
lake ontario open waters from mexico bay to the saint lawrence
river-
141 pm edt sat jul 18 2026

.this afternoon...south winds 15 to 25 knots becoming southwest.
patchy smoke early. showers and thunderstorms.
some thunderstorms may produce gusty winds. waves 2 to 4 feet
building to 3 to 5 feet. 
.tonight...southwest winds 15 to 25 knots becoming north. a
chance of showers and thunderstorms early, then a chance of
showers late in the evening. waves 3 to 6 feet subsiding to 2 to
4 feet. 
.sunday...north winds 15 to 20 knots becoming west 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.sunday night...west winds 5 to 15 knots. waves 1 to 2 feet. 
.monday...southwest winds 5 to 10 knots becoming south and
increasing to 15 to 20 knots. waves 1 foot or less building to
3 to 5 feet. 
.tuesday...south winds 15 to 20 knots becoming southwest. showers
with a chance of thunderstorms. waves 3 to 6 feet subsiding to
2 to 4 feet. 
.wednesday...west winds 15 to 20 knots. showers likely during the
day, then a chance of showers wednesday night. waves 3 to 5 feet.

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1236 pm edt sat jul 18 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 cold front will slice across the lake this afternoon and evening, 
with this front attached to a 29.4 inch area of low pressure 
crossing southeastern 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 a warm front crossing the lake monday night 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>065-182100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1236 pm edt sat jul 18 2026

.this afternoon...southwest winds 15 to 25 knots. patchy smoke
early. showers and thunderstorms. some
thunderstorms may produce gusty winds. waves 3 to 5 feet. 
.tonight...west winds 15 to 25 knots becoming north. a chance of
showers and thunderstorms early, then a chance of showers late in
the evening. waves 3 to 6 feet. 
.sunday...north winds 15 to 20 knots becoming west 5 to 15 knots.
waves 2 to 4 feet subsiding to 1 to 2 feet. 
.sunday night...west winds 5 to 15 knots. waves 1 to 2 feet. 
.monday...southwest winds 5 to 10 knots becoming south and
increasing to 15 to 20 knots. waves 1 foot or less building to
3 to 5 feet. 
.tuesday...south winds 15 to 20 knots becoming southwest. showers
with a chance of thunderstorms. waves 3 to 6 feet subsiding to
3 to 5 feet. 
.wednesday...west winds 15 to 25 knots. showers likely during the
day, then a chance of showers wednesday night. waves 3 to 6 feet.

winds and waves higher in and near thunderstorms.

$$