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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt mon oct 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 30.2 inch high over the upper midwest will build 
across the great lakes through tuesday, before sliding into the 
northeast wednesday. a cold front will then pass across the lake 
thursday. a 30.1 inch surface high will then ridge north across the 
lake friday.


loz063>065-051500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt mon oct 5 2026

.today...northwest winds to 30 knots. waves 5 to 8 feet building
to 7 to 10 feet. waves occasionally around 13 feet. 
.tonight...northwest winds 15 to 25 knots. waves 5 to 9 feet
subsiding to 3 to 5 feet. waves occasionally around 11 feet. 
.tuesday...northwest winds 5 to 15 knots becoming west. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday night...west winds 5 to 15 knots becoming south 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.wednesday...south winds 15 to 25 knots becoming west and
diminishing to 10 to 15 knots. a chance of showers wednesday
night. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.thursday...west winds 15 to 20 knots. a chance of showers. waves
2 to 4 feet building to 3 to 5 feet, then subsiding to 2 to
4 feet. 
.friday...west winds 10 to 15 knots. a chance of showers. waves
2 to 4 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt mon oct 5 2026


slz022-024-051500-
saint lawrence river from cape vincent to saint regis
403 am edt mon oct 5 2026

.today...west winds 10 to 15 knots becoming northwest 15 to
20 knots. partly to mostly sunny. 
.tonight...northwest winds 10 to 15 knots becoming west. mostly
cloudy early, then clearing. 
.tuesday...west winds 5 to 10 knots. sunny.
.tuesday night...southwest winds 10 knots or less becoming south
10 to 15 knots. mainly clear in the evening, then becoming partly
cloudy. 
.wednesday...south winds 10 to 15 knots becoming southwest 5 to
10 knots. a chance of showers. 
.thursday...southwest winds 5 to 15 knots becoming west. showers
likely. 
.friday...west winds 10 knots or less. a chance of showers. 

$$