Beach
Spiaggia di Su Portu
Italy · sea 25.3 °C at its warmest, in August

Sea temperature month by month
14.5Jan
14Feb
14.1Mar
15.1Apr
17.4May
20.7Jun
23.7Jul
25.3Aug
24.1Sep
21.6Oct
18.6Nov
15.9Dec
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 Spiaggia di Su Portu?
The sea off Spiaggia di Su Portu averages 25.3 °C at its warmest, in August, and 14 °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 Spiaggia di Su Portu?
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 Spiaggia di Su Portu?
Spiaggia di Su Portu is on the coast of Italy, at 38.8973, 8.8863. The map on this site flies straight to it.