An excessive heat warning now has been extended through Thursday for the Phoenix metropolitan area and several communities in Southern Arizona.
The National Weather Service said the high temperature in the Phoenix area reached 110 degrees on Monday, which tied the record for the date set in 2006.
They said the normal temperature this time of year is about 100 degrees.
Meteorologists said highs in the Phoenix area are expected to be around 107 to 109 for the next three days.
Excessive heat warnings also have been issued for Tucson, Nogales, Sierra Vista, Safford, Willcox and parts of the Tohono O'odham Nation.
Authorities are urging people to drink plenty of water, wear hats and light-colored clothing and avoid spending time outside during the peak heat hours of the day.