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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sat oct 3 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 30.3 inch high will slide northeast into northern new 
england tonight. a 29.7 inch low over northwest ontario sunday will 
deepen to 29.4 inches as it slides just south of james bay into 
central quebec sunday night, 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>065-040300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt sat oct 3 2026

.tonight...northeast winds 10 to 15 knots becoming southeast
15 to 20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.sunday...southeast winds 15 to 20 knots becoming south 10 to
15 knots. waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 
.sunday night...south winds 10 to 15 knots becoming west 15 to
20 knots. a chance of showers. waves 1 to 3 feet building to 3 to
6 feet. 
.monday...northwest winds to 30 knots. waves 5 to 8 feet. waves
occasionally around 10 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. 
.wednesday...south winds 15 to 20 knots becoming southwest. a
chance of showers wednesday night. waves 3 to 5 feet subsiding to
2 to 4 feet. 
.thursday...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet 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 pm edt sat oct 3 2026


slz022-024-040300-
saint lawrence river from cape vincent to saint regis
403 pm edt sat oct 3 2026

.tonight...northeast winds 10 knots or less becoming east. clear
through the early overnight, then becoming partly cloudy. 
.sunday...southeast winds 10 knots or less becoming south. mostly
sunny early, then becoming mostly cloudy. 
.sunday night...south winds 5 to 15 knots becoming west. a chance
of showers in the evening, then showers likely overnight. 
.monday...west winds 5 to 15 knots becoming northwest. a chance
of showers in the morning. 
.monday night...northwest winds 5 to 15 knots becoming west.
becoming mainly clear. 
.tuesday...west winds 10 knots or less becoming south. mainly
clear. 
.wednesday...south winds 5 to 15 knots becoming southwest. a
chance of rain showers wednesday night. 
.thursday...southwest winds 5 to 10 knots. partly cloudy. 

$$