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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sun oct 4 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 29.7 inch low over northwest ontario today will deepen 
to 29.4 inches as it slides just south of james bay over central 
quebec tonight, while sending a pair of cold fronts across the lake. 
a 30.2 inch high over the upper midwest will then build across the 
great lakes monday into tuesday, before sliding into the northeast 
wednesday. a cold front will then pass across the lake thursday.


loz063>065-041500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sun oct 4 2026

.today...southeast winds 15 to 20 knots becoming south. waves
2 to 4 feet. 
.tonight...southwest winds 10 to 15 knots becoming northwest and
increasing to 15 to 25 knots. a chance of showers from late
evening on. waves 1 to 3 feet building to 4 to 7 feet. waves
occasionally around 9 feet. 
.monday...northwest winds to 30 knots. waves 5 to 8 feet building
to 6 to 10 feet. waves occasionally around 13 feet. 
.monday night...northwest winds 15 to 25 knots. waves 5 to 8 feet
subsiding to 2 to 4 feet. waves occasionally around 10 feet. 
.tuesday...northwest 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. a chance
of showers. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.thursday...west winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers. waves 2 to 4 feet building to 3 to
5 feet, then subsiding to 1 to 3 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt sun oct 4 2026


slz022-024-041500-
saint lawrence river from cape vincent to saint regis
403 am edt sun oct 4 2026

.today...southeast winds 10 knots or less becoming south 10 to
15 knots. partly sunny this morning, then becoming mostly cloudy.
.tonight...south winds 5 to 15 knots becoming west. a chance of
showers in the evening, then showers likely after midnight. a
chance of showers late. 
.monday...west winds 5 to 15 knots becoming northwest. mostly
sunny in the morning, then becoming partly sunny. 
.monday night...northwest winds 5 to 15 knots becoming west.
becoming mainly clear. 
.tuesday...west winds 10 knots or less becoming south 10 to
15 knots. mainly clear, then becoming partly cloudy. 
.wednesday...south winds 5 to 15 knots becoming southwest. a
chance of showers. 
.thursday...southwest winds 10 knots or less becoming west. a
chance of showers. 

$$