In general the weather here at California is really nice. There are only several real hot days during summer. Not everyone here have air conditioning in their home. You need to be creative to be comfortable through those days.
There are some things you can do to cool down for those days. Greatist has a collection of ideas to help you achieve that. Read through the information in the following link and enjoy a nice summer.
And here is makeup for those hot summer nights. Cool?