Beach
Middle Beach
St. Johns County, United States · sea 28 °C at its warmest, in August

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020, sampled 21 km offshore, at the nearest open water cell of a 0.25° grid.
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 Middle Beach?
The sea off Middle Beach averages 28 °C at its warmest, in August, and 17.9 °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 Middle Beach?
The sea reaches 20 °C or more from April to December. Twenty degrees is where most swimmers stop calling water cold; below it, a wetsuit helps.
Where is Middle Beach?
Middle Beach is on the coast of St. Johns County, United States, at 30.1168, -81.3448. The map on this site flies straight to it.