I didn’t think they got all the way to LA, the coastal breeze is supposed to push them back so they get close but not quite. So it makes sense that there it’s just humidity. Last time I was in the LA area during summer all the talk was the inversion layer. I like monsoons better.
I think that’s a reasonable perception, but we do get the warm humid air flow from down south at times. Most of the time our weather comes from the North West and sometimes the West South West.
At other times, we get the weather patterns that see hot humid air from weather patterns down off the cost of Mexico carrying warm humid tropical air.
We only get that a few times per year. It sounds like you may get more.