What Is the Normal Body Temperature Range?

Quick Answer: What Is the Normal Body Temperature for a Human?

The normal body temperature of a human body is generally between 97°F and 99°F (36.1°C to 37.2°C), with 98.6°F (37°C) often quoted as the average. Newer research shows the real average may be slightly lower, closer to 97.9°F. Temperature normal in Fahrenheit can shift through the day and differs by age, so a single reading outside this range is not automatically a problem, but a temperature above 100.4°F (38°C) is considered fever and one below 95°F (35°C) is hypothermia, both of which need medical attention.

Have a question about your temperature readings? Call Felix Hospitals: +91 9667064100, 24x7 Internal Medicine and General Health.

Medically reviewed by Dr. Sonakshi Saxena (MBBS, MD, Internal Medicine), Felix Hospitals, Noida. Dr. Saxena routinely assesses fever and temperature related concerns in her internal medicine practice and reviews this guide based on day to day clinical experience. Last reviewed: June 2026.

What Is Normal Body Temperature?

For more than 150 years, 98.6°F (37°C) has been treated as the gold standard for normal body temperature of human body. This figure comes from research published in 1851 by German physician Carl Wunderlich, based on temperature readings taken from thousands of patients.

More recent research suggests this number runs a little high for most people today. A 2020 Stanford University analysis of data spanning nearly 160 years found that average body temperature has been gradually falling, and now sits closer to 97.9°F (36.6°C). Researchers believe this drop is linked to lower rates of chronic infection and better living standards compared to the 1800s, not a sign that anything is wrong with the human body itself.

In practical terms, most doctors today consider a temperature normal in Fahrenheit anywhere between 97°F and 99°F (36.1°C to 37.2°C). What is the normal body temperature for a human will still vary a little from person to person depending on age, the time of day, and how the temperature is measured.

Normal Body Temperature of Human Body by Age

Body temperature of human body is not identical across all ages. Here is a simple breakdown our internal medicine team refers to during routine checkups.

What Affects Your Body Temperature Reading?

The normal body temperature of humans can shift slightly because of several everyday factors, not just illness.

• Age and gender
• Body type and size
• Where the temperature is measured, for example under the tongue versus the armpit
• The particular time of day, temperatures usually run lowest in the early morning and highest in the evening
• Climatic conditions and weather changes
• Measuring body temperature right after intense physical activity
• Having an infection of any kind

High Body Temperature or Fever

Use a digital thermometer to accurately track your readings and figure out if a change is something to worry about. When body temperature rises above 100.4°F (38°C), it is classified as fever, and this needs medical attention if it does not settle quickly.

Fever is usually the body's natural response to an infection. Certain medical conditions, including hyperthyroidism and other endocrine disorders, can also raise core temperature. It is best to consult a doctor if fever lasts more than two days, or if it comes with chills, sweating, or other symptoms that feel out of the ordinary.

Low Body Temperature or Hypothermia

Sometimes the human body temperature drops below the usual 98.6°F (37°C) range. This drop can be caused by various medical conditions or infections. When body temperature falls drastically below 95°F (35°C), it is termed hypothermia, and this can affect how internal organs function.

Ignoring hypothermia can lead to organ related complications, so prompt medical consultation is important to bring things back under control. In severe cases, hypothermia can become life threatening and needs emergency care without delay.

Does Fluctuation in Body Temperature Affect Your Health?

A rise or fall in temperature normal in Fahrenheit terms can matter more for people who already have a chronic health condition. For example, someone with a respiratory infection may go on to develop more serious symptoms such as breathing difficulty or even heart related complications if temperature changes are ignored.

Conditions like diabetes or cancer can also make it harder for the body to fight off infections effectively. So if you have an existing medical condition and notice your temperature shifting outside the usual range, it is best to see a doctor early rather than waiting for symptoms to worsen.

Tips to Keep Your Body Temperature in a Healthy Range

Winter Season

• Wear warm clothing in several light layers rather than one heavy layer
• Keep hand gloves and socks on through the day in very cold weather
• Avoid direct, prolonged exposure to extreme cold
• Keep your home environment warm and use heaters safely

Heat or Summer Season

• Drink plenty of water through the day, roughly eight glasses, since the body needs extra hydration in heat
• Avoid direct, prolonged contact with the sun
• Choose light coloured, breathable clothing
• Take short breaks during high intensity or physically demanding days
• Use fans or air conditioning to keep indoor spaces cool, especially during heatwaves
• Watch for heat stroke symptoms such as confusion or excessive sweating, and seek medical help right away if you suspect it

Why Choose Felix Hospitals for Fever and Temperature Related Concerns in Noida?

Experienced Internal Medicine Team

• Dr. Ravi Sharma (MBBS, MD), Senior Consultant General Physician, 42+ years of clinical experience, specialises in heart, lung, abdomen, neurology, diabetes, and thyroid related conditions.
• Dr. Anshumala Sinha (MBBS, MD, MRCP), 20+ years of experience, internal medicine and diabetology specialist, expertise in fever, infectious disease, hypertension, and preventive medicine.
• Dr. Priyanka Singh (MBBS, MD), 10+ years of experience, internal medicine, focused on personalised and up to date patient care.
• Dr. Sonakshi Saxena (MBBS, MD), 7+ years of experience, internal medicine, known for a patient-centric approach to diagnosis and treatment.

Comprehensive Diagnostic Care

• In-house NABL accredited lab for quick fever and infection workups
• 24x7 emergency services for high fever or hypothermia
• Access to specialist referrals for underlying conditions like thyroid disorders or diabetes

Patient-Centred Care

• NABH-accredited hospital
• 24x7 emergency services
• Transparent billing practices

Call Felix Hospitals: +91 9667064100, 24x7 Internal Medicine and General Health

References

Clinical guidance in this article is consistent with research published by Stanford University on long-term trends in human body temperature, along with general internal medicine standards followed by the World Health Organization (WHO).