Dangerous heat returns to southern Arizona with low rain chances
TUCSON, Arizona — A persistent dome of high pressure is once again tightening its grip on Southern Arizona, driving temperatures dangerously high and limiting rain-cooled relief. For Tuesday, July 8, conditions remain partly cloudy and hot, with scattered storms most likely to form southeast of Tucson, especially across Graham, Greenlee, and Cochise counties.
These isolated storms may bring gusty outflow winds and blowing dust, particularly near open desert areas and highways like Interstate 10 and State Route 191.
The most extreme heat is expected Wednesday, with an Excessive Heat Warning in effect from 10:00 a.m. to 8:00 p.m. Temperatures could soar to 110°F (43°C) or higher in parts of Pima County, with Tucson forecast to reach 108°F (42°C) under limited cloud cover and oppressive humidity.
This weather pattern reflects a low-grade monsoon setup, with minimal atmospheric instability and limited moisture aloft. While some moisture influx remains possible later in the week, the primary threat continues to be dangerous heat and dry lightning in storm-prone areas.
Wednesday is expected to be the hottest day of the week, with overnight lows remaining elevated, hovering near 80°F (27°C) in the urban core.
Residents and visitors across Tucson, Sierra Vista, and Safford should anticipate intense sun, strong UV exposure, and very limited rain potential through midweek.
