Extreme Heat Warning Hits Parker Valley, Yuma, Temperatures Reach 112°

An Extreme Heat Warning covered Parker Valley and Yuma until 8 p.m. MST/PDT Monday, with afternoon temperatures expected to climb from 106 to 112 degrees and the National Weather Service flagging a Major Heat Risk across the lower Colorado River corridor.

The warning stretched beyond La Paz County into nearby California desert areas, including Chuckwalla Valley, Imperial Valley and Palo Verde Valley. In Parker, the forecast called for a high near 110 degrees, and by 10:50 a.m. PDT the thermometer already read 104 degrees with 7% humidity and a heat index of 98, a fast rise that showed how quickly conditions were turning dangerous.

Arizona health officials amplified the alert for La Paz and Yuma counties, warning that daytime highs could reach 112 degrees and urging residents to drink water, limit time in the heat and check on neighbors and family members. They also pointed people to air-conditioned public spaces such as malls, libraries and community centers, along with cooling centers, hydration stations and heat-illness data tools.

The National Weather Service said strenuous outdoor activity should be rescheduled, breaks should be taken in shade or air conditioning, and lightweight, loose-fitting clothing should be worn. It also said heat-related illnesses increase significantly during extreme heat events and that heat stroke is an emergency. Anyone overcome by heat should be moved immediately to a cool, shaded location.

The danger lands hard in a part of Arizona where heat arrives early and often. National Weather Service climate data for Yuma shows the average first 100-degree day comes on May 2, while the average first 110-degree day arrives June 11. The same climate record shows Yuma saw as many as 53 days at 110 degrees or higher in one year.

State health officials say Arizona averages about 4,298 emergency-room visits each year for heat-related illness, and more than 4,320 people died from excessive heat exposure in the state from 2013 to 2024. La Paz, Mohave and Yuma counties have the highest heat-related death rates per capita, underscoring how quickly a spring heat wave can turn into a countywide public-safety problem.