May 23, · You’re said to have severe hyperthermia if your body temperature is above °F (40°C). By comparison, a body temperature of 95°F (35°C) or lower is Author: James Roland. Apr 01, · As a general rule, adults should consider seeking medical attention if their temperature reaches above °F (40°C). Doctors consider this temperature to be Author: Rachel Nall, MSN, CRNA.
Sep 17, · Adults typically have a fever if their body temperature increases to °F (38°C). This is called a low grade fever. A high grade fever happens when your body temperature is °F (°C) or.