Among the states affected, Utah.
Las Vegas recorded its equal highest temperature ever on Tuesday of 47.2C.
Relief could be coming, however. As of Monday, the area remained under a warning from the National Weather Service that "gusty winds and low humidities will combine to cause critical fire weather conditions this afternoon".
SALT LAKE CITY (AP) - Better weather conditions have limited the growth of a wildfire in Utah that has prompted the evacuation of 1,500 people from hundreds of homes and cabins, officials said Sunday night. The fire sparked when a vehicle crashed on a Los Angeles County freeway. The winds picked up, and soon a hillside was on fire. No injuries were reported and more than a dozen residential buildings were damaged.
In southern Arizona, the Frye Fire has covered almost 30,000 acres as of Saturday afternoon and was 29 percent contained, the forest service at Coronado National Forest said.
Utah crews were finishing fighting fires Monday at Lincoln Beach, located near Payson (2,252 acres burned) and at Dry Hills in Uintah County (435 acres burned).
Arizona Gov. Doug Ducey plans to visit the area Thursday.
Noel alleges that logging could have cleaned up dead, bug-infested trees that have fueled the so-called Brian Head fire; a conservation group said his accusations are "shameful" and misleading and don't take into account climate change and drought. "It's big - we need help!"
She is relying on social media updates from friends and others who live or have homes in the area.
"#PLACERITAFIRE 760 acres 75% cont", said the Los Angeles County Fire Department in a Tweet Monday.
Fifty homes were put under mandatory evacuation orders on the suburban edges of Burbank, where flames raced uphill through tinder-dry grass.
In Arizona, firefighters had to ground aircraft after they spotted drones being flown near the fire, Bureau of Land Management spokesman Dennis Godfrey said. Winds made conditions more unsafe for some 500 firefighters assigned to the inferno, and the blaze was just 1 percent contained on Tuesday night.
Some 20 large fires are blazing in the West as the fire season gets under way.
The blaze, dubbed the Goodwin Fire, has charred 21,000 acres and destroyed a number of homes since starting on Saturday in the Prescott National Forest, 70 miles north of Phoenix. In Southern California, a wildfire broke out after a auto crashed on a freeway and prompted evacuations of nearby homes in the city of Santa Clarita.
A 400-acre (162-hectare) fire in Mariposa County on the western Sierra foothills is 10 percent surrounded. Nearly 1 million more acres had burned by Thursday, compared with the 10-year average through June 22.