Phoenix Records Hottest August Day on Record
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PHOENIX – Phoenix experienced its hottest August day on record Thursday, with a high temperature of 118 degrees.
Previously, the hottest August day ever recorded in Phoenix was 117 degrees, which was first hit in 2011 and then matched in 2020 and 2023, according to historical records from the National Weather Service (NWS). This demonstrates a clear trend of increasing extreme heat events in the region.
Thursday also tied July 9 for the hottest day of 2025 so far.
Additionally, the 118 degree mark shattered a 120-year-old daily heat record for Phoenix by 6 degrees.
The previous highest temperature for Aug. 7 was 112 degrees, which was first set way back in 1905 and tied in 2012.
Hottest August day extends ongoing heat wave
This record-breaking temperature is part of a prolonged and intense heat wave affecting Phoenix and the broader Southwestern United States. Heat waves occur when high-pressure systems stall over a region, trapping hot air and preventing cooler air from moving in. The intensity and duration of these events are increasing due to climate change, which is raising baseline temperatures and exacerbating extreme weather patterns.
Understanding the Impact of Extreme Heat
Extreme heat isn’t just about discomfort; it poses meaningful risks to public health. Heatstroke and heat exhaustion are serious conditions that can occur when the body overheats. Vulnerable populations, including the elderly, young children, outdoor workers, and those with chronic illnesses, are especially susceptible. The body regulates its temperature through sweating, but this process becomes less effective in high humidity, as sweat doesn’t evaporate as easily. Staying hydrated, seeking shade, and limiting strenuous activity during peak heat hours are crucial for preventing heat-related illnesses.
Looking Ahead: Continued Heat and Climate Change
Forecasters predict continued high temperatures in phoenix and surrounding areas. The long-term trend points to more frequent and severe heat waves as a result of climate change. Mitigation efforts to reduce greenhouse gas emissions are essential to slow down the rate of warming. Adaptation strategies,such as improving urban cooling infrastructure (e.g., planting trees, using reflective surfaces) and establishing heat action plans, are also vital to protect communities from the impacts of extreme heat. The National weather Service provides valuable resources and alerts to help residents stay safe during heat waves: https://www.weather.gov/
Key Takeaways
- Phoenix recorded its hottest August day on record at 118 degrees on August 7,2025.
- This temperature surpassed the previous record of 117 degrees set in 2011, 2020, and 2023.
- The record is part of a larger, ongoing heat wave and reflects a trend of increasing extreme heat events linked to climate change.
- Extreme heat poses significant health risks, particularly for vulnerable populations.