Beach
Plage Bourda
Cayenne, France · sea 28.2 °C at its warmest, in July

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 19 km offshore, at the nearest open water cell of a 0.25° grid.
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 Bourda?
The sea off Plage Bourda averages 28.2 °C at its warmest, in July, and 27 °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 Bourda?
The sea reaches 20 °C or more from All year. Twenty degrees is where most swimmers stop calling water cold; below it, a wetsuit helps.
Where is Plage Bourda?
Plage Bourda is on the coast of Cayenne, France, at 4.9332, -52.2833. The map on this site flies straight to it.