The highest reliably documented body temperature ever recorded in a human who survived is about 46.5°C (115.7°F) , measured in a man hospitalized with severe heat stroke on July 10, 1980, in Atlanta, USA.

Quick Scoop: Extreme Human Temperature

  • The record case involves a 52‑year‑old man (often cited as Willie Jones) admitted with heat stroke during a heat wave in Atlanta in 1980.
  • His core body temperature was measured at around 46–46.5°C (115–115.7°F) , which is considered the highest reliably recorded in medical literature for a surviving patient.
  • He remained in the hospital for over three weeks but ultimately survived , which makes this case famous in medical and popular sources.

How does that compare to normal?

  • Normal human body temperature is roughly 36.5–37.5°C (97.7–99.5°F) , depending on the person and how it is measured.
  • Fevers above about 40–41°C (104–105.8°F) are already considered very dangerous and can damage organs if prolonged.
  • Many medical references note that fevers rarely exceed 41–42°C (106–108°F) under typical illness conditions; beyond this range, survival becomes less likely without rapid treatment.

Why such high temperatures are so dangerous

When body temperature climbs into the hyperpyrexia/hyperthermia range (around 41°C and above), proteins and cell structures begin to fail, leading to:

  • Brain and nervous system injury.
  • Heart strain and rhythm problems.
  • Kidney and liver damage.
  • Coagulation problems and shock.

In the 1980 record case, aggressive cooling (including ice and intensive care) was used to bring the patient’s temperature down quickly , which is likely why he survived despite the extreme reading.

Related: “How hot can humans tolerate?”

Separately from fever records, researchers talk about an upper limit of temperature and humidity (often discussed using “wet‑bulb temperature”) beyond which the human body cannot effectively cool itself by sweating, but people usually suffer heat illness well before that theoretical maximum.

Information gathered from public forums or data available on the internet and portrayed here.