The highest temperature ever recorded on a human was 115 degrees Fahrenheit or 46 degrees Celsius. This was the body temperature of 52-year-old Willie Jones of Atlanta, who was admitted to the hospital with heatstroke in 1980. It is important to note that this is an extremely dangerous temperature and can lead to multiple organ failure and seizures.

It is worth mentioning that the highest temperature ever recorded on Earth was 134 degrees Fahrenheit or 56.7 degrees Celsius, which was recorded on July 10, 1913, at Furnace Creek Ranch in Death Valley, California. However, this is not a human body temperature.