Extreme Heat Warning Continues As Dangerous Temperatures Grip Tucson

Heat-related illnesses increase significantly during extreme heat events, according to the National Weather Service.

By Vianella Burns, Patch Staff

Jun 24, 2026 9:02 am MST

Heat-related illnesses increase significantly during extreme heat events, according to the National Weather Service. (Patch Graphics)

TUCSON, AZ — Tucson is bracing for another stretch of dangerous heat, with temperatures expected to reach as high as 111 degrees and an Extreme Heat Warning remaining in effect through 8 p.m. Thursday.

The National Weather Service forecasts afternoon highs between 107 and 111 degrees across Tucson and much of southern Arizona through Thursday evening.

Forecasters are also warning of localized major heat risk, with temperatures running well above normal for late June.

The warning covers the Tucson metro area, southeast Pinal County, the Upper Gila River Valley and the Upper San Pedro River Valley north of Benson. Communities included in the warning area include Tucson, Marana, Vail, Green Valley, Sierra Vista, Benson, Safford, Mammoth, Oracle and Clifton.

Heat-related illnesses become significantly more likely during prolonged periods of extreme heat, particularly for people who work outdoors, older adults, young children and those without reliable access to air conditioning.

The weather service urges residents to limit strenuous outdoor activities during the hottest part of the day whenever possible, wear lightweight and loose-fitting clothing, and stay hydrated by drinking plenty of water throughout the day.

Residents should also be familiar with the signs of heat exhaustion and heat stroke.

For people working outdoors, federal workplace safety guidelines recommend taking frequent breaks in shaded or air-conditioned areas to reduce the risk of heat-related illness.

Anyone showing signs of heat stroke should be moved to a cool location immediately, and 911 should be called right away. Heat stroke is a medical emergency that can quickly become life-threatening if left untreated.

The warning remains in effect through 8 p.m. Thursday, with the most dangerous conditions expected during the afternoon and early evening hours.

Residents can monitor forecast updates from the National Weather Service as the extreme heat continues across southern Arizona.