Normal Body Temperature: Ranges, Age Differences & Correct Measurement

Many people still believe that a “normal” body temperature is exactly 36.6°C. In reality, modern medicine confirms that the normal range is 35.9–37.2°C.
Body temperature varies based on age, time of day, physical activity, and the place where you measure it.

What Influences Body Temperature

1. Place of measurement

Different methods provide different values:

Rectal temperature – highest and most accurate.
Oral temperature – about 0.5°C higher than underarm.
Axillary (underarm) – lowest and the least precise.

2. Time of day

lowest temperature — early morning,
highest — in the evening.

3. Physical activity and emotions

After exercise, a hot bath, or strong stress, temperature may temporarily rise.

Temperature in different age groups

Children

Because infants’ thermoregulation is immature:

they overheat easily,
temperature rises with crying, laughing, feeding, or bathing,
sometimes it may reach up to 38°C without illness.

Adults

The normal range remains 35.9–37.2°C.

Seniors (65+)

Temperature may drop to 36.0–36.3°C.

Hormonal and physiological factors

Men typically have slightly lower temperatures.

Women experience variations due to the menstrual cycle:

temperature rises by 0.3–0.5°C during ovulation,
and drops before menstruation.

Menopause can also affect temperature stability.

Dangerous temperature ranges

40.5–41°C — life-threatening.
32.2°C — stupor, slowed reactions.
30–29°C — loss of consciousness.
<26.5°C — high risk of death.

How to measure body temperature correctly

Measurement sites:

axillary,
oral,
rectal.

Differences:

rectal temperature is about 1°C higher,
oral — about 0.5°C higher than axillary.

For accurate results:

keep the skin dry,
press the thermometer firmly,
wait 15–20 minutes after physical activity or meals.

Smart thermometer Omron Eco Temp Intelli IT

The smart thermometer Omron Eco Temp Intelli IT:

provides high measurement accuracy,
syncs with the Remed app and stores all data,
shows temperature trends over time,
suitable for both children and adults,
sends data to your doctor during an online consultation.

A fast, convenient, and reliable solution to monitor your health.

Omron Eco Temp Intelli IT Thermometer

The Eco Temp Intelli IT thermometer accurately measures body temperature in real time. The main advantage of the Eco Temp thermometer is its ability to connect to the REMED.CARE app, which provides efficient data transfer with temperature measurement results to your phone for viewing trends in a graph. It is convenient, fast, and painless, and will provide a clear picture of trends to your doctor online.

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When to seek medical help

If you measure dangerous temperature values or symptoms worsen, contact a doctor immediately or use Remed online consultations.

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Main topics

About the company

What Body Temperature Is Considered Normal for Children and Adults

What Influences Body Temperature

1. Place of measurement

2. Time of day

3. Physical activity and emotions

Temperature in different age groups

Children

Adults

Seniors (65+)

Hormonal and physiological factors

Dangerous temperature ranges

How to measure body temperature correctly

Smart thermometer Omron Eco Temp Intelli IT

Omron Eco Temp Intelli IT Thermometer

When to seek medical help