Weather in LA doesn't swing drastically. The big blue thing on the other side of the beach tends to moderate it. When it does swing, it is because the air has charged over the desert, been forced to go over the mountains (which raises the temp) and we get lovely Santa Ana winds in the 80's.
Contrast that experience with the two :Low Temperature maps below. These are not weeks apart. This is today's Low Temperature, versus tomorrow's Low Temperature.
Today
Tomorrow
Do you see the problem here?!?