Beach
Ag. Panteleimonas
Agios Nikolaos Municipality, Greece · sea 25.2 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 29 km offshore, at the nearest open water cell of a 0.25° grid.
About
tourist beach
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 Ag. Panteleimonas?
The sea off Ag. Panteleimonas averages 25.2 °C at its warmest, in August, and 15.6 °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 Ag. Panteleimonas?
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 Ag. Panteleimonas?
Ag. Panteleimonas is on the coast of Agios Nikolaos Municipality, Greece, at 35.1269, 25.7337. The map on this site flies straight to it.