Beach
Shibukawa Beach
Japan · sea 27.5 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 27 km offshore, at the nearest open water cell of a 0.25° grid.
About
渋川海岸(しぶかわかいがん)は、岡山県玉野市渋川に位置する海岸。瀬戸内海国立公園に属する景勝地で、当海岸の海水浴場は岡山県下最大である。環境省による快水浴場百選をはじめ、日本の渚百選、日本の白砂青松100選に選定されている。
Questions
How warm is the sea at Shibukawa Beach?
The sea off Shibukawa Beach averages 27.5 °C at its warmest, in August, and 12.9 °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 Shibukawa Beach?
The sea reaches 20 °C or more from June to October. Twenty degrees is where most swimmers stop calling water cold; below it, a wetsuit helps.
Where is Shibukawa Beach?
Shibukawa Beach is on the coast of Japan, at 34.4539, 133.9047. The map on this site flies straight to it.