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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt wed jul 15 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.


loz062-160900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt wed jul 15 2026

.overnight...west winds 5 to 15 knots. smoke. waves 2 feet
or less. 
.thursday...west winds 5 to 15 knots. smoke. waves 1 to 3 feet. 
.thursday night...northwest winds 15 to 20 knots becoming
northeast 5 to 15 knots. smoke. waves 1 to 3 feet. 
.friday...northeast winds 10 knots or less becoming east. areas
of smoke in the morning. waves 1 foot or less. 
.friday night...southeast winds 5 to 10 knots. showers likely
overnight. waves 1 foot or less. 
.saturday...south 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 5 to 15 knots becoming west. 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.

$$

fzus61 kbuf 160202
glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt wed jul 15 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>065-160900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt wed jul 15 2026

.overnight...west winds 5 to 15 knots becoming northwest.
smoke. waves 1 to 3 feet. 
.thursday...west winds 5 to 15 knots increasing to 15 to
20 knots. smoke. waves 1 to 3 feet building to 2 to 4 feet. 
.thursday night...west winds 15 to 20 knots becoming north 5 to
15 knots. smoke. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.friday...northeast winds 10 knots or less becoming south. areas
of smoke in the morning. waves 2 feet or less. 
.friday night...south winds 5 to 15 knots becoming southeast. 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 2 feet
building to 3 to 5 feet. 
.sunday...northwest winds 15 to 20 knots becoming west 5 to
15 knots. a chance of showers during the day. waves 2 to 4 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 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
1002 pm edt wed jul 15 2026


slz022-024-160900-
saint lawrence river from cape vincent to saint regis
1002 pm edt wed jul 15 2026

.overnight...west winds 5 to 10 knots. smoke.
.thursday...southwest winds 10 knots or less becoming northwest
10 to 15 knots. smoke.
.thursday night...northwest winds 10 knots or less. smoke.
.friday...northwest winds less than 10 knots becoming west. areas
of smoke in the morning. 
.friday night...southwest winds less than 10 knots 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. a chance of showers during the day. 
.monday...southwest winds 10 knots or less becoming south. a
chance of showers monday night. 

winds and waves higher in and near thunderstorms.

$$