Beach
Plaża Mariny di Ragusa
Marina di Ragusa, Italy · sea 26 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 18 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 Plaża Mariny di Ragusa?
The sea off Plaża Mariny di Ragusa averages 26 °C at its warmest, in August, and 15.1 °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 Plaża Mariny di Ragusa?
The sea reaches 20 °C or more from June to November. Twenty degrees is where most swimmers stop calling water cold; below it, a wetsuit helps.
Where is Plaża Mariny di Ragusa?
Plaża Mariny di Ragusa is on the coast of Marina di Ragusa, Italy, at 36.7815, 14.5614. The map on this site flies straight to it.