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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 ridge averaging 29.9 inches extends from the northwestern 
great lakes before a weak cold front sweeps southward across lake 
ontario thursday evening through thursday night. behind the front, 
another ridge averaging 30.1 inches builds southeastward through 
friday before exiting toward southern new england friday night. on 
saturday, a warm front should sweep northeastward across lake 
ontario and then a cold front should sweep eastward across the lake 
later in the day as a 29.7 inch low moves eastward across the 
northern great lakes. behind the low and cold front, a ridge 
averaging 29.9 inches should impact lake ontario as the ridge slides 
southeastward across the eastern great lakes through monday.


loz062-161500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt thu jul 16 2026

.today...west winds 5 to 15 knots. smoke. waves 1 to 3 feet. 
.tonight...northwest winds 15 to 20 knots becoming northeast 5 to
15 knots. smoke. waves 1 to 3 feet. 
.friday...east winds 10 knots or less. areas of smoke. waves
1 foot or less. 
.friday night...southeast winds 5 to 10 knots becoming south. a
chance of showers overnight. waves 1 foot or less. 
.saturday...southwest winds 10 to 15 knots becoming northwest
15 to 20 knots. showers with a chance of thunderstorms. waves
1 to 3 feet building to 2 to 4 feet. 
.sunday...north winds 15 to 20 knots becoming west and
diminishing to 5 to 10 knots. waves 1 to 3 feet subsiding to
1 foot or less. 
.monday...southwest winds 10 knots or less increasing to 10 to
15 knots. a chance of showers monday night. waves 2 feet 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
402 am 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 ridge averaging 29.9 inches extends from the northwestern 
great lakes before a weak cold front sweeps southward across lake 
ontario thursday evening through thursday night. behind the front, 
another ridge averaging 30.1 inches builds southeastward through 
friday before exiting toward southern new england friday night. on 
saturday, a warm front should sweep northeastward across lake 
ontario and then a cold front should sweep eastward across the lake 
later in the day as a 29.7 inch low moves eastward across the 
northern great lakes. behind the low and cold front, a ridge 
averaging 29.9 inches should impact lake ontario as the ridge slides 
southeastward across the eastern great lakes through monday.


loz063>065-161500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt thu jul 16 2026

.today...west winds 5 to 15 knots increasing to 15 to 20 knots.
smoke. waves 1 to 3 feet building to 2 to 4 feet. 
.tonight...west winds 15 to 20 knots becoming northeast 5 to
15 knots. smoke in the evening. 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. a chance of
showers overnight. waves 2 feet or less. 
.saturday...south winds 15 to 20 knots becoming northwest.
showers with a chance of thunderstorms. waves 1 to 3 feet
building to 3 to 5 feet. 
.sunday...northwest winds 15 to 20 knots becoming west 5 to
15 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. 

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
402 am edt thu jul 16 2026


slz022-024-161500-
saint lawrence river from cape vincent to saint regis
402 am edt thu jul 16 2026

.today...southwest winds 10 knots or less becoming northwest
10 to 15 knots. smoke.
.tonight...northwest winds 10 knots or less. smoke in the
evening. 
.friday...northwest winds less than 10 knots becoming west.
sunny.
.friday night...southwest winds 10 knots or less becoming south.
a chance of showers overnight. 
.saturday...south winds 5 to 10 knots becoming northwest. showers
with a chance of thunderstorms. 
.sunday...northwest winds 5 to 10 knots becoming light and
variable. mainly clear. 
.monday...southwest winds 10 knots or less becoming south. a
chance of showers monday night. 

winds and waves higher in and near thunderstorms.

$$