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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sat sep 5 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 high pressure ridge averaging 30.1 inches builds gradually from 
northern ontario through monday. a cold front will sweep southward 
across lake ontario tuesday. behind the front, another ridge 
averaging 30.1 inches builds from near james bay through tuesday 
night. on wednesday, the ridge should exit southeastward and allow a 
warm front to sweep northeastward across lake ontario.


loz063>065-052100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt sat sep 5 2026

.this afternoon...north winds 5 to 10 knots. waves 1 foot or less.
.tonight...north winds 5 to 15 knots becoming northeast. waves
1 to 3 feet. 
.sunday...northeast winds 5 to 15 knots. waves 1 to 3 feet. 
.sunday night...north winds 10 knots or less becoming northwest.
waves 2 feet or less. 
.monday...northwest winds 10 knots or less becoming west. waves
1 foot or less. 
.tuesday...southwest winds 10 knots or less becoming south 10 to
15 knots. a chance of showers tuesday night. waves 2 feet or
less. 
.wednesday...south winds 15 to 25 knots becoming west. showers
likely. waves 2 to 4 feet building to 3 to 6 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt sat sep 5 2026


slz022-024-052100-
saint lawrence river from cape vincent to saint regis
1003 am edt sat sep 5 2026

.this afternoon...northeast winds 10 knots or less. a chance of
showers. 
.tonight...northeast winds 10 knots or less. partly cloudy in the
evening, then becoming mainly clear. 
.sunday...northeast winds 5 to 10 knots becoming north. mostly
sunny. 
.sunday night...northwest winds less than 10 knots. patchy fog
overnight. 
.monday...light and variable winds. mainly clear, then becoming
partly cloudy. 
.tuesday...northwest winds 10 knots or less becoming south. a
chance of showers tuesday night. 
.wednesday...south winds 10 to 15 knots becoming southwest.
showers likely. 

$$