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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt thu jul 30 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 trough averaging 29.6 inches exits eastward while a ridge 
averaging 30.0 inches builds from the western great lakes through 
tonight. the ridge exits slowly eastward friday through saturday 
before a cold front sweeps eastward across lake ontario on sunday. 
in the wake of the front, a 30.0 inch high builds from the western 
great lakes through this monday.


loz063>065-301500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt thu jul 30 2026

.today...north winds 5 to 15 knots becoming west. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tonight...west winds 10 knots or less becoming northwest. waves
1 foot or less. 
.friday...northwest winds 10 knots or less becoming west. waves
1 foot or less. 
.friday night...southwest winds 10 knots or less becoming south.
waves 1 foot or less. 
.saturday...south winds 10 knots or less. a chance of showers
during the day, then showers likely with a chance of
thunderstorms saturday night. waves 1 foot or less. 
.sunday...southwest winds 10 knots or less becoming north.
showers likely with a chance of thunderstorms during the day,
then a chance of showers sunday night. waves 1 foot or less. 
.monday...north winds 10 knots or less becoming west. waves
1 foot or less. 

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 thu jul 30 2026


slz022-024-301500-
saint lawrence river from cape vincent to saint regis
403 am edt thu jul 30 2026

.today...northeast winds 10 knots or less becoming north. a
chance of showers late this morning. a chance of showers and
thunderstorms this afternoon. 
.tonight...north winds less than 10 knots. a chance of showers
early. patchy fog from late evening on. 
.friday...light and variable winds. patchy fog in the morning. 
.friday night...southwest winds less than 10 knots becoming
south. mostly cloudy. 
.saturday...southwest winds less than 10 knots. showers likely
during the day, then showers with a chance of thunderstorms
saturday night. 
.sunday...south winds less than 10 knots becoming northwest.
showers with a chance of thunderstorms. 
.monday...northwest winds less than 10 knots. mainly clear. 

winds and waves higher in and near thunderstorms.

$$