Beach
Jōdogahama
Miyako, Japan · sea 21.2 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 13 km offshore, at the nearest open water cell of a 0.25° grid.
About
Jōdogahama (浄土ヶ浜) (lit. 'Pure Land Beach') is a series of rock formations along the coast of Miyako Bay in the city of Miyako, Iwate Prefecture, in the Tōhoku region of northern Japan.
Questions
How warm is the sea at Jōdogahama?
The sea off Jōdogahama averages 21.2 °C at its warmest, in August, and 6.3 °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 Jōdogahama?
The sea reaches 20 °C or more from August to September. Twenty degrees is where most swimmers stop calling water cold; below it, a wetsuit helps.
Where is Jōdogahama?
Jōdogahama is on the coast of Miyako, Japan, at 39.6489, 141.9817. The map on this site flies straight to it.