Beach
Arched Rock Beach
Sonoma County, United States · sea 12.9 °C at its warmest, in September

Sea temperature month by month
Monthly means in °C, NOAA OISST v2.1 climatology 1991–2020.
About
beach in Sonoma County, California
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 Arched Rock Beach?
The sea off Arched Rock Beach averages 12.9 °C at its warmest, in September, and 10.6 °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 Arched Rock 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 Arched Rock Beach?
Arched Rock Beach is on the coast of Sonoma County, United States, at 38.3678, -123.0728. The map on this site flies straight to it.
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