Beach
Plage de Passable
Saint-Jean-Cap-Ferrat, France · sea 24.6 °C at its warmest, in August

Sea temperature month by month
13.9Jan
13.3Feb
13.5Mar
14.6Apr
17.5May
21.1Jun
23.7Jul
24.6Aug
22.4Sep
19.8Oct
17.4Nov
15.4Dec
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 de Passable?
The sea off Plage de Passable averages 24.6 °C at its warmest, in August, and 13.3 °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 Plage de Passable?
The sea reaches 20 °C or more from June to September. Twenty degrees is where most swimmers stop calling water cold; below it, a wetsuit helps.
Where is Plage de Passable?
Plage de Passable is on the coast of Saint-Jean-Cap-Ferrat, France, at 43.6937, 7.3252. The map on this site flies straight to it.