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open lake forecast for lake ontario
national weather service buffalo ny
1002 am 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. a 29.5 inch low will then move from 
southern lower michigan tonight to just north of the lake friday 
morning before reaching the saint lawrence valley by late friday 
afternoon. 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.


loz063>065-152100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt thu oct 15 2026

.this afternoon...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.tonight...east winds 10 to 15 knots becoming southeast and
increasing to 30 knots after midnight. periods of rain after
midnight. waves 1 to 3 feet building to 3 to 6 feet. 
.friday...south winds to 30 knots becoming west. periods of rain.
waves 5 to 8 feet building to 6 to 9 feet. waves occasionally
around 11 feet. 
.friday night...northwest winds to 30 knots becoming north. a
chance of showers in the evening. waves 5 to 9 feet. waves
occasionally around 11 feet. 
.saturday...north winds to 30 knots becoming west and diminishing
to 15 to 20 knots. waves 5 to 8 feet subsiding to 3 to 5 feet.
waves occasionally around 10 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
10 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
1003 am edt thu oct 15 2026


slz022-024-152100-
saint lawrence river from cape vincent to saint regis
1003 am edt thu oct 15 2026

.this afternoon...northeast winds 10 knots or less. partly to
mostly sunny. 
.tonight...northeast winds 5 to 10 knots becoming east. a chance
of rain showers after midnight. periods of rain late. 
.friday...southeast winds 10 to 15 knots becoming west 15 to
20 knots. periods of rain. 
.friday night...northwest winds 10 to 15 knots increasing to
15 to 20 knots. rain likely in the evening. 
.saturday...northwest winds 15 to 20 knots becoming southwest and
diminishing to 10 knots or less. becoming mainly clear. 
.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. 

$$