Beach
Plage des Sables Blancs de Concarneau
Concarneau, France · sea 17.9 °C at its warmest, in August

Sea temperature month by month
10.7Jan
10Feb
10.1Mar
11.5Apr
13.6May
15.9Jun
17.3Jul
17.9Aug
17Sep
15.8Oct
14Nov
12.2Dec
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020.
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 Plage des Sables Blancs de Concarneau?
The sea off Plage des Sables Blancs de Concarneau averages 17.9 °C at its warmest, in August, and 10 °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 Plage des Sables Blancs de Concarneau?
The sea here never averages 20 °C in any month, so swimming means cold water all year. Some people do it anyway.
Where is Plage des Sables Blancs de Concarneau?
Plage des Sables Blancs de Concarneau is on the coast of Concarneau, France, at 47.8824, -3.9342. The map on this site flies straight to it.