Beach
Sunset Beach
Honolulu County, United States · sea 26.8 °C at its warmest, in September

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020.
About
Sunset Beach is on the North Shore of Oahu in Hawaii and known for big wave surfing during the winter season. The original Hawaiian name for this place is Paumalū.
Questions
How warm is the sea at Sunset Beach?
The sea off Sunset Beach averages 26.8 °C at its warmest, in September, and 23.9 °C at its coolest. These are monthly means from NOAA's OISST v2.1 satellite and buoy record for 1991 to 2020, sampled at the beach's own coordinates.
When can you swim at Sunset Beach?
The sea reaches 20 °C or more from All year. Twenty degrees is where most swimmers stop calling water cold; below it, a wetsuit helps.
Where is Sunset Beach?
Sunset Beach is on the coast of Honolulu County, United States, at 21.6644, -158.0520. The map on this site flies straight to it.