Beach
Honokalani Black Sand Beach
Wai'anapanapa State Park, United States · sea 26.5 °C at its warmest, in September

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 16 km offshore, at the nearest open water cell of a 0.25° grid.
About
sand beach in Hawaii
Wikipedia has no article about this beach yet. It is on the atlas from its Wikidata record and its photograph.
Questions
How warm is the sea at Honokalani Black Sand Beach?
The sea off Honokalani Black Sand Beach averages 26.5 °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 Honokalani Black Sand 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 Honokalani Black Sand Beach?
Honokalani Black Sand Beach is on the coast of Wai'anapanapa State Park, United States, at 20.7888, -156.0036. The map on this site flies straight to it.
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