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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt thu oct 15 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 30.4 inch high will drift east across quebec and new 
england through tonight. meanwhile, a 29.5 inch low will move from 
southern lower michigan tonight to just north of the lake friday 
morning, while pushing an attendant warm front across the lake. the 
low will then reach the saint lawrence valley by late friday 
afternoon, while dragging an attendant cold front across the lake. 
this low will deepen to 29.1 inches as it moves from the saint 
lawrence valley friday night to the canadian maritimes saturday. a 
strong and broad 30.6 inch high is then forecast to build from the 
ohio valley saturday night to the mid atlantic and southern new 
england by sunday night, before drifting south of the canadian 
maritimes monday. another 30.4 inch high over northwestern ontario 
province will then build southeast across the lower great lakes 
monday night into tuesday.


loz063>065-160300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt thu oct 15 2026

.tonight...east winds 10 to 15 knots becoming southeast and
increasing to 30 knots after midnight. a chance of rain late this
evening. rain after midnight. waves 1 to 3 feet building to 4 to
7 feet. waves occasionally around 9 feet. 
.friday...south winds to 30 knots becoming west. rain through
early afternoon, then a chance of rain late. waves 4 to 7 feet
building to 6 to 9 feet. waves occasionally around 11 feet. 
.friday night...northwest winds to 30 knots becoming north. a
chance of rain in the evening. waves 5 to 9 feet. waves
occasionally around 11 feet. 
.saturday...north winds to 30 knots becoming northwest and
diminishing to 10 to 15 knots in the afternoon. waves 5 to 8 feet
subsiding to 2 to 4 feet. waves occasionally around 10 feet. 
.saturday night...west winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 5 feet. 
.sunday...southwest winds 15 to 20 knots. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.monday...southwest winds 15 to 20 knots diminishing to 5 to
15 knots. waves 2 to 4 feet subsiding to 1 foot or less. 
.tuesday...west winds 10 knots or less becoming northeast. waves
1 foot or less. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt thu oct 15 2026


slz022-024-160300-
saint lawrence river from cape vincent to saint regis
403 pm edt thu oct 15 2026

.tonight...northeast winds 5 to 10 knots becoming east. rain
after midnight. 
.friday...southeast winds 10 to 15 knots becoming west 15 to
20 knots. rain in the morning, then rain likely in the afternoon.
.friday night...northwest winds 15 to 20 knots. mostly cloudy. 
.saturday...northwest winds 15 to 20 knots becoming west 5 to
15 knots. sunny.
.saturday night...west winds 10 knots or less becoming southwest.
mainly clear in the evening, then becoming partly cloudy. 
.sunday...southwest winds 5 to 15 knots. mainly clear. 
.monday...southwest winds 5 to 15 knots diminishing to less than
10 knots. mainly clear, then becoming partly cloudy. 
.tuesday...light and variable winds. becoming mainly clear. 

$$