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open lake forecast for lake ontario
national weather service buffalo ny
1003 pm edt thu jul 16 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 weak cold front moves southward across lake ontario this evening. 
behind the front, a ridge averaging 30.1 inches builds from the 
upper great lakes through friday. a warm front should sweep 
northeastward across lake ontario friday night through saturday 
morning as the ridge exits toward new england and a 29.7 inch low 
moves eastward across the northwestern great lakes. later on 
saturday, a cold front should move eastward across lake ontario as 
the low moves farther eastward toward southern quebec. behind the 
low and cold front, a 29.9 inch ridge should slide southeastward 
across the great lakes through monday. a warm front should sweep 
northeastward across lake ontario monday night and a cold front 
should sweep eastward across the lake on tuesday as a 29.5 inch low 
moves eastward across northern ontario and northern quebec.


loz063>065-170900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 pm edt thu jul 16 2026

.overnight...north winds 15 to 20 knots becoming northeast
10 to 15 knots. areas of smoke. waves 2 to 4 feet subsiding to
1 to 3 feet. 
.friday...northeast winds 10 knots or less becoming east. waves
2 feet or less. 
.friday night...southeast winds 5 to 15 knots becoming south.
smoke. waves 2 feet or less. 
.saturday...south winds 15 to 20 knots becoming southwest. patchy
smoke in the morning. showers likely in the morning, then showers
with thunderstorms likely in the afternoon. waves 1 to 3 feet. 
.saturday night...west winds 15 to 20 knots becoming north.
showers with thunderstorms likely in the evening, then showers
likely overnight. waves 2 to 4 feet building to 3 to 5 feet. 
.sunday...northwest winds 15 to 20 knots becoming west and
diminishing to 5 to 10 knots. waves 3 to 5 feet subsiding to
1 foot or less. 
.monday...southwest winds 5 to 10 knots becoming south and
increasing to 15 to 20 knots. a chance of showers monday night.
waves 1 foot or less building to 1 to 3 feet. 
.tuesday...southwest winds 15 to 25 knots becoming west. showers
likely. waves 2 to 4 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
1003 pm edt thu jul 16 2026


slz022-024-170900-
saint lawrence river from cape vincent to saint regis
1003 pm edt thu jul 16 2026

.overnight...north winds 5 to 15 knots becoming northwest.
patchy smoke. 
.friday...northwest winds 10 knots or less becoming west. sunny.
.friday night...southwest winds 10 knots or less becoming
southeast. a chance of showers overnight. 
.saturday...southeast winds 5 to 15 knots becoming southwest.
patchy smoke in the morning. showers in the morning, then showers
with a chance of thunderstorms in the afternoon. 
.saturday night...southwest winds 5 to 15 knots becoming
northwest. showers with a chance of thunderstorms in the evening,
then showers likely overnight. 
.sunday...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. a chance of showers monday night. 
.tuesday...south winds 5 to 15 knots becoming southwest. showers
likely. 

winds and waves higher in and near thunderstorms.

$$