In Phoenix, the low on Monday morning was just 90 degrees, the earliest in the calendar year on record in which the low had not dropped below that threshold.
In addition to the historic heat in the desert, record heat stretched almost to the Southern California coast. Los Angeles International Airport set a daily record high of 95 Monday, while Burbank spiked to 111 degrees.
The heat coupled with strong winds and extremely dry conditions were blamed for fanning two fires that torched over 4,500 acres in the San Gabriel Mountains above Los Angeles.
While the intensity of the heat is forecast to diminish some Tuesday, excessive heat warnings remain over many areas of the Southwest.
In Southern California, the National Weather Service is warning that the “extreme fire danger” will persist through at least Tuesday due to heat, high winds and low humidity.