Extreme Heat Warnings Persist Across Southwestern U.S., Temperatures Reach 120°F (49°C)
• A dangerous heatwave continues to intensify across the southwestern United States, with Extreme Heat Warnings active in many areas as of July 31, 2026, at 08:37 UTC. The National Weather Service (NWS) forecasts temperatures ranging from 44–49°C (112–120°F) in parts of Arizona and California, including Phoenix, Yuma, and the Imperial Valley, through August
• The Weather Prediction Center (WPC) has issued Major to Extreme HeatRisk alerts for the region, with dozens of daily and monthly high-temperature records expected to be broken. The heatwave is also spreading into the Intermountain West and northern High Plains, with temperatures of 32–43°C (90–109°F) forecast in states like Nevada, Wyoming, and Montana. Warm nighttime temperatures, ranging from 18–24°C (65–75°F), are compounding the heat's impact by limiting overnight relief.
Impact & Risks
The ongoing heatwave poses significant risks to public health, particularly for individuals without access to effective cooling or adequate hydration. Prolonged exposure to extreme heat can lead to heat-related illnesses, especially for those engaging in outdoor activities. Vulnerable populations, including the elderly, children, and outdoor workers, are at heightened risk. The NWS has warned that areas such as the Antelope Valley in California and lower-elevation regions of northern Arizona could experience some of the hottest conditions, with temperatures reaching up to 46°C (115°F). Additionally, the warm nights may exacerbate heat stress, as they prevent the body from cooling down effectively.
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