Beach
Trestrignel Beach
Perros-Guirec, France · sea 16.9 °C at its warmest, in August

Sea temperature month by month
10.5Jan
9.7Feb
9.4Mar
10.3Apr
11.8May
13.8Jun
15.7Jul
16.9Aug
16.9Sep
15.7Oct
13.8Nov
12Dec
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020.
About
beach in Côtes-d'Armor, France
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 Trestrignel Beach?
The sea off Trestrignel Beach averages 16.9 °C at its warmest, in August, and 9.4 °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 Trestrignel Beach?
The sea here never averages 20 °C in any month, so swimming means cold water all year. Some people do it anyway.
Where is Trestrignel Beach?
Trestrignel Beach is on the coast of Perros-Guirec, France, at 48.8189, -3.4316. The map on this site flies straight to it.