Beach
Four Mile Beach
Tasmania, Australia · sea 17.6 °C at its warmest, in February

Sea temperature month by month
16.8Jan
17.6Feb
17.4Mar
16.1Apr
14.6May
13.4Jun
12.8Jul
12.3Aug
12.2Sep
12.7Oct
13.9Nov
15.4Dec
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020.
About
beach in Australia
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 Four Mile Beach?
The sea off Four Mile Beach averages 17.6 °C at its warmest, in February, and 12.2 °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 Four Mile 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 Four Mile Beach?
Four Mile Beach is on the coast of Tasmania, Australia, at -42.6100, 148.0300. The map on this site flies straight to it.