Seconding @Perrry here that this isn’t a specific lat/long coordinate thing.
It is pervasive all along the West Coast in winter. Here’s a map of how far it stretches this one particular day in the central coast:
That fog is moving eastwards and will hit the mountains, then roll over them.
Here’s a good link for more reading. Also, the map they include is from the area where the photo I posted is located. If you look where Half Moon Bay is (KHAF) and see where the little bump of fog points NE towards highway 101, the photo would be approximately right at the edge of that fog bump as it is cresting the Santa Cruz mountains.
Part of the reason this is so important for the sim is that IRL, GA airports like KHAF are regular IFR practice spots because of the consistent IMC, frequently down to minimums. So pilots out of San Carlos (KSQL) or Palo Alto (KPAO) where the fog does not reach will often head over there for their IFR hours.