Tucson, AZ – Triple-digit heat will surge across southern Arizona by 11 a.m. Thursday, creating dangerous conditions that could overwhelm outdoor workers and strain public health through Sunday evening.
According to the National Weather Service in Tucson, an Extreme Heat Warning remains in effect from 11 a.m. Thursday until 8 p.m. Sunday, with highs reaching 100 to 108°F across Tucson, Pima County, and Pinal County. Slightly lower but still hazardous temperatures of 95 to 100°F are expected in Cochise County, including Sierra Vista, Douglas, and Willcox.
In the Tucson metro area, pavement temperatures will climb rapidly along I-10, I-19, and major surface roads by early afternoon, increasing the risk of heat exhaustion for anyone outside between noon and 6 p.m. Communities such as Marana, Oro Valley, and Green Valley could see prolonged exposure risks during peak sun hours, especially Friday and Saturday when heat intensity peaks.
Rural areas including the Tohono O’odham Nation and Upper Gila River Valley face elevated danger for residents without reliable cooling. Officials urge limiting outdoor activity, scheduling work before 10 a.m., and taking frequent shaded breaks. Never leave children or pets in vehicles, where temperatures can turn fatal within minutes.
The heat threat will persist through 8 p.m. Sunday, with additional advisories possible if extreme conditions continue into early next week.
