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National Integrated Heat Health Information System (NIHHIS)

This online portal provides information and resources to help communities understand—and prepare for—the health impacts of extreme heat.
NIHHIS logo

Extreme heat—whether in the form of rising long-term average temperatures or punctuated by heat waves—is a global health threat. In the U.S., it is already deadlier than all other natural disasters combined, and it will clearly be exacerbated by a changing climate.

This web-based integrated information system provides authoritative and usable resources on the subject of heat health. Users can view active heat warnings by state; find collections of tools and reports specific to heat health; get targeted information on managing heat health hazards among at-risk populations; view map-based weekly, monthly, and seasonal heat outlooks; and receive up-to-date heat health news.  

NIHHIS is an interagency partnership developed by the Centers for Disease Control and Prevention, the National Oceanic and Atmospheric Administration, and domestic and international partners, with a goal of:

  • Building understanding of the problem of extreme heat,
  • Defining demand for climate services that enhance societal resilience,
  • Developing science-based products and services from a sustained climate science research program, and
  • Improving capacity, communication, and societal understanding of the problem in order to reduce morbidity and mortality due to extreme heat.
Last modified
2 August 2019 - 4:24pm