Beach
Plage de l'Alga
Haute-Corse, France · sea 24.5 °C at its warmest, in August

Sea temperature month by month
13.7Jan
13.2Feb
13.5Mar
14.8Apr
17.4May
20.8Jun
23.5Jul
24.5Aug
22.6Sep
20.3Oct
17.7Nov
15.1Dec
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020.
About
beach in Corsica
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 Plage de l'Alga?
The sea off Plage de l'Alga averages 24.5 °C at its warmest, in August, and 13.2 °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 Plage de l'Alga?
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 Plage de l'Alga?
Plage de l'Alga is on the coast of Haute-Corse, France, at 42.5614, 8.7275. The map on this site flies straight to it.