What is the approximate normal body temperature range for adults in Celsius?

• A. 36.0°C to 37.0°C
• B. 37.5°C to 38.5°C
• C. 36.5°C to 37.5°C
• D. 35.5°C to 36.5°C

Answer: (C)

Normal body temperature in adults hovers around 37°C, but there isn’t a single fixed value—there is a normal range. The commonly accepted approximate range is about 36.5°C to 37.5°C. This reflects natural daily fluctuations and differences between measurement sites. Circadian rhythms can shift your temperature by about half a degree, tending to be a bit cooler in the early morning and warmer later in the day. Measurement method also matters: oral readings sit a little lower than core measurements like rectal, and other sites (tympanic, axillary) can vary by a few tenths of a degree. So 36.5°C to 37.5°C captures the typical normal range for a healthy adult. Values above roughly 38°C often indicate fever, while values around or below 36°C can indicate hypothermia, depending on context.