Southern California doesn't know what to do with May. Most places will give you mildly sunny for the duration. Southern California doesn't do "mildly" sunny. It's all or nothing here. So it tries to compromise in its own way: one day it will be cool and overcast/hazy, mid-70s; the next, sunny and borderline 90s. In other words, take half the days from spring and half the days from summer, mix well, serve. Bam! May!

On an unrelated note, be very afraid.