The mercury were expected to soar to the 90s for Los Angeles and Orange counties, 100s in the Inland Empire, Valleys and High Desert communities and upper-70s for the local mountains.
The San Bernardino and Riverside county valleys are under a heat advisory through 7 p.m. Friday.
It's not just the extreme heat that's causing concern. Thursday, a storm cell brought rain to Banning and other areas. The storm also caused flash flooding. In Mentone, a creek turned into a raging river and firefighters had to rescue a trapped couple.
Flash flood watches are in effect for the desert and mountain areas, lasting until about 8 p.m. Friday.
Some relief from the heat is expected by Monday with the humidity dropping as well as the temperatures.
Some out-of-towners visiting downtown Los Angeles said they appreciated the heat, but the locals were singing a different tune. Many said they're ready for some fall-like weather.