According to the National Weather Service, excessive heat is expected to last until Wednesday, June 21st in the Southern California area.
Here's the California Office of Emergency Services State Wide Weather Briefing for June 16-21, 2017 with more information.
There are places called Cooling Centers that you can go to if you need relief from the excessive heat. Here is a list of those in Los Angeles County.
Here are some tips provided by DDS Safety Net on what you can do to stay safe this summer.