Beach
Plage de Tamaricciu
Porto-Vecchio, France · sea 25.2 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020.
About
beach in Corsica
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 de Tamaricciu?
The sea off Plage de Tamaricciu averages 25.2 °C at its warmest, in August, and 13.6 °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 de Tamaricciu?
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 Plage de Tamaricciu?
Plage de Tamaricciu is on the coast of Porto-Vecchio, France, at 41.5491, 9.3086. The map on this site flies straight to it.