A Heat Advisory is in effect for the foothills for Sunday through Tuesday as well.
An excessive heat warning is in effect for the Coachella Valley and the San Gorgonio Pass zone, which includes the cities of Banning and Desert Hot Springs, will remain in until 9 p.m. Wednesday.
Temperatures are expected to climb in the upper 90s in central and south central Oklahoma and temperatures could reach as high as 106 degrees in western and north central parts of the state.
Starting Saturday, the century mark will be crossed, according to the weather service.
Excessive heat watches, similar to heat advisories, are issued when conditions are favorable for an excessive heat event in the next 24 to 72 hours, while excessive heat warnings are issued when the maximum heat index temperature is expected to be 105-degrees or higher for at least two days and night time air temperatures will not drop below 75-degrees.
Bay City News reports that the National Weather Service predicts that inland Bay Area cities face "temperatures in the triple digits, up to 20 degrees higher than normal". In the Coachella Valley, highs are predicted to be 109 to 114 degrees today, 112 to 117 degrees Sunday, 114 to 119 degrees Monday, 117 to 122 degrees Tuesday and 115 to 120 degrees Wednesday. "Couple this with extreme summer heat, no shade and rocky, unstable terrain, and many hikers quickly find themselves overwhelmed and under prepared".
Sheriff's Search and Rescue volunteers and deputies in the sheriff's ASTREA helicopters have this year already responded to 24 incidents of distressed hikers at Three Sisters Falls and Cedar Creek Falls.
It's about to get really hot in the Southwest, and health officials want people to stay alert.
The health department warns not to leave children or pets in a parked vehicle.