Beach
Naksan Beach
Gangwon Province, South Korea · sea 24.2 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020.
About
Naksan Beach (Korean: 낙산해수욕장) is a beach in Yangyang County, Gangwon Province, South Korea. It first opened to the public on July 22, 1962.
Questions
How warm is the sea at Naksan Beach?
The sea off Naksan Beach averages 24.2 °C at its warmest, in August, and 8.1 °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 Naksan Beach?
The sea reaches 20 °C or more from July to September. Twenty degrees is where most swimmers stop calling water cold; below it, a wetsuit helps.
Where is Naksan Beach?
Naksan Beach is on the coast of Gangwon Province, South Korea, at 38.1156, 128.6364. The map on this site flies straight to it.