Beach
Marina di Alberese
Grosseto, Italy · sea 24.9 °C at its warmest, in August

Sea temperature month by month
14.5Jan
13.8Feb
13.9Mar
15.1Apr
18May
21.5Jun
24Jul
24.9Aug
23.1Sep
21Oct
18.6Nov
16.1Dec
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 Marina di Alberese?
The sea off Marina di Alberese averages 24.9 °C at its warmest, in August, and 13.8 °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 Marina di Alberese?
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 Marina di Alberese?
Marina di Alberese is on the coast of Grosseto, Italy, at 42.6491, 11.0355. The map on this site flies straight to it.