An upper level ridge is parked over the region. Offshore flow has allowed not only the interior to bake but also produced warm coastal valleys as well. The offshore looks to weaken some over the next few days for a gentle downward trend at the coast but inland temps will be near or above 100 into Wednesday.
There is a small, thin but persistent marine layer producing much cooler beach conditions and this looks to be around as well. This will mean there will be a wide variety of temperatures in the forecast in very short spans of space.
That upper level ridge driving the warmth looks to break on Wednesday, this will be more noticeable at the coast with a thicker marine layer later Wednesday into Thursday but inland the push downward on temps will take time but Thursday we should see lower 90s inland with mid to upper 80s to close the weekend and begin next week.