September is a popular month to ask about Sandy Hook because conditions can shift week to week along this coast. Expect the water near 21.0°C, with daily variation from wind, tides and recent storms. We refresh the live value from Open-Meteo Marine every hour, so the headline above always reflects the current state of the Atlantic Ocean.
Sandy Hook sea temperature in September — averages 21.0°C
The sea at Sandy Hook in United States averages 21.0°C during September, based on long-run climatology for the Atlantic Ocean. Use the live reading below for today's actual water and the monthly grid to compare with the rest of the year.
Average sea · September
21.0°C
warm · Excellent
Live water now
…
Recommended wetsuit
Shorty 2mm
At 21.0°C a 2mm shorty keeps surfers warm; lap swimmers can usually skip the neoprene.
Monthly comparison
Yes — comfortable for most swimmers · Sandy Hook
Can you swim at Sandy Hook in June? — 19.0°C water19.0°CCan you swim at Sandy Hook in July? — 23.0°C water23.0°CCan you swim at Sandy Hook in August? — 23.0°C water23.0°CCan you swim at Sandy Hook in September? — 21.0°C water21.0°CCan you swim at Sandy Hook in October? — 17.0°C water17.0°CCan you swim at Sandy Hook in November? — 12.0°C water12.0°C
Frequently asked questions
What is the average sea temperature at Sandy Hook in September?
Sandy Hook averages 21.0°C in September, based on long-run climatology for the Atlantic Ocean.
Is the sea warm enough to swim at Sandy Hook in September?
Yes, most swimmers find 21.0°C comfortable for unrestricted swimming.
Do I need a wetsuit at Sandy Hook in September?
Most swimmers don't need a wetsuit; a rash vest helps for longer sessions.