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open lake forecast for lake ontario
national weather service buffalo ny
403 am 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 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>065-181500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt sat jul 18 2026

.today...south winds 15 to 20 knots becoming southwest. showers
likely early, then showers with a chance of thunderstorms from
late morning on. areas of smoke. some thunderstorms may produce
gusty winds this afternoon. waves 1 to 3 feet building to 3 to
5 feet. 
.tonight...west winds 15 to 20 knots becoming north. a chance of
showers and thunderstorms early. some thunderstorms may produce
gusty winds early. 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 15 knots becoming south and
increasing to 15 to 25 knots. a chance of showers monday night.
waves 1 foot or less building to 3 to 5 feet. 
.tuesday...south winds 15 to 25 knots becoming west. showers with
a chance of thunderstorms. waves 3 to 6 feet subsiding to 3 to
5 feet. 
.wednesday...west winds 15 to 20 knots. a chance of showers and
thunderstorms. waves 3 to 6 feet. 

winds and waves higher in and near thunderstorms.

$$

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


slz022-024-181500-
saint lawrence river from cape vincent to saint regis
403 am edt sat jul 18 2026

.today...south winds 5 to 15 knots becoming southwest. showers
with a chance of thunderstorms. areas of smoke late this morning.
some thunderstorms may produce gusty winds this afternoon. 
.tonight...west winds 5 to 15 knots becoming northwest. showers
with a chance of thunderstorms early. 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 10 knots or less becoming south 10 to
15 knots. partly cloudy, then becoming mostly cloudy. 
.tuesday...south winds 15 to 20 knots becoming southwest 5 to
15 knots. showers with a chance of thunderstorms. 
.wednesday...southwest winds 5 to 10 knots becoming west. showers
likely with a chance of thunderstorms during the day, then a
chance of showers and thunderstorms wednesday night. 

winds and waves higher in and near thunderstorms.

$$