Beach
Praia do Boldró
Fernando de Noronha, Brazil · sea 28.6 °C at its warmest, in April

Sea temperature month by month
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, and is covered inside the article on Fernando de Noronha.
Questions
How warm is the sea at Praia do Boldró?
The sea off Praia do Boldró averages 28.6 °C at its warmest, in April, and 26.4 °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 Praia do Boldró?
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 Praia do Boldró?
Praia do Boldró is on the coast of Fernando de Noronha, Brazil, at -3.8449, -32.4332. The map on this site flies straight to it.