Phoenix reached 110 degrees Monday for the first time this year.
Meanwhile, the battle against raging wildfires in the area continues. A fire that ignited in Los Angeles County grew to 1,400 acres Monday and stands at 30 percent contained.
In Arizona, the so-called 377 Fire grew to 1,500 acres, and people had to be evacuated. It was at zero percent containment.
Some of the heat will move into western Texas and the Southern Plains starting Tuesday, and some areas could approach records in the next few days.
Severe weather hits Plains
Severe storms are forecast for the Midwest and Plains over the next several days as a storm system and a cold front move through the area.
Severe storms will develop Tuesday in the Dakotas and into Minnesota. The biggest threat will be damaging winds, large hail and tornadoes.