What should the temperature be on your forehead? A guide to accurate readings

September 27, 2025 •

4 min read

The long-held average normal body temperature of 98.6°F has been shown to vary among individuals and throughout the day. This variability makes it essential to understand what should the temperature be on your forehead? and how to interpret your results accurately.

Quick Summary

A normal forehead temperature typically falls within a range of 97°F to 99°F (36.1°C to 37.2°C) for adults, and is often a bit lower than an oral reading. The correct measurement technique and awareness of external factors are key to interpreting a reading accurately.

Key Points

Normal Range: A typical forehead temperature for an adult is between 97°F and 99°F, but this can vary based on the individual.
Measurement Location: Forehead readings are generally slightly lower than oral temperatures, sometimes by 0.5°F to 1°F.
Influencing Factors: Environmental temperature, physical activity, and sweat can all affect the accuracy of a forehead temperature reading.
Accurate Reading: To get the best results, use the thermometer according to the manufacturer’s instructions and ensure the forehead is clean and dry.
Fever Threshold: For a forehead reading, a temperature of 100.4°F or higher is often considered a fever, but check specific medical guidance.
Comparison: Forehead thermometers are convenient but less accurate than rectal or oral readings for core body temperature.

Understanding Normal Forehead Temperature

While the classic average body temperature is cited as 98.6°F (37°C), recent research indicates a person's normal body temperature can fluctuate within a wider range, typically 97°F to 99°F (36.1°C to 37.2°C) for adults. When measuring on the forehead using a temporal or non-contact infrared thermometer, the reading is often slightly lower than an oral temperature, sometimes by 0.5°F to 1°F (0.3°C to 0.6°C). Therefore, what should the temperature be on your forehead? is best understood as a range, rather than a single fixed number. The key is to know your own baseline and to look for significant deviations from that norm.

Factors Influencing Your Forehead Temperature Reading

Several variables can affect your forehead temperature reading, making it important to consider more than just the number on the display.

Thermometer Type

Temporal Artery Thermometers: These devices scan the temporal artery on the forehead, providing a quick reading. They are generally reliable but can be affected by technique and ambient temperature.
Non-Contact Infrared Thermometers (NCITs): These are particularly useful for screening and for taking a temperature in a way that minimizes cross-contamination risk. However, they require careful use to ensure accuracy, including maintaining the correct distance from the forehead.

Environmental and Physiological Factors

Ambient Temperature: Measuring your temperature immediately after coming in from a cold outdoor environment can result in a lower-than-accurate reading. The same is true if you've been in a very warm or humid place.
Sweat: Sweat can cause a cooling effect on the skin, potentially leading to a lower reading than your actual body temperature. It's best to wipe away any sweat before taking a measurement.
Activity Level: Strenuous physical activity can raise your body temperature. It's advisable to rest for a few minutes before taking a reading to ensure it's not artificially elevated.
Age and Time of Day: Your body temperature naturally fluctuates throughout the day, often being lowest in the morning and highest in the evening. Also, infants and young children can have a wider normal temperature range than adults.

How to Take an Accurate Forehead Temperature

To ensure you get the most reliable reading possible, follow these steps:

Read the Instructions: Always follow the manufacturer's specific instructions for your thermometer, especially regarding the proper distance for non-contact models.
Ensure a Stable Environment: Take the reading in a room with a stable, comfortable temperature. Avoid taking it immediately after entering from extreme heat or cold.
Prepare the Forehead: Gently wipe away any sweat or moisture. Ensure there is no hair covering the forehead area.
Use Consistent Technique: For a temporal thermometer, place the sensor on the center of the forehead and slide it toward the hairline near the top of the ear. For a non-contact thermometer, hold it at the specified distance.
Take Multiple Readings: For confirmation, take a few readings to ensure consistency. If the readings vary significantly, re-check the technique or try another location.

When a Forehead Temperature Indicates a Fever

While a slightly elevated temperature may not be a cause for concern, there are established fever thresholds. A fever is an elevated body temperature and is a sign that the body is fighting an illness. For a forehead (temporal) reading, a temperature of 100.4° F (38.0° C) or higher is generally considered a fever, though this can vary by age and specific medical guidance. It is crucial to consider the person's age, other symptoms, and any medical advice they have received.

Comparing Forehead Readings to Other Methods

It's helpful to understand how a forehead reading compares to other common methods. While forehead readings are convenient for screening, other methods like oral and rectal can be more accurate for measuring core body temperature, especially in infants.


Measurement Method	Typical Reading Difference from Oral	Accuracy Consideration
Oral (Mouth)	Standard (e.g., 98.6°F)	Can be affected by recent eating or drinking.
Forehead (Temporal)	0.5°F to 1°F (0.3°C to 0.6°C) lower	Fast, non-invasive; can be affected by environment or sweat.
Rectal	0.5°F to 1°F (0.3°C to 0.6°C) higher	Considered the most accurate for infants; invasive.
Armpit (Axillary)	0.5°F to 1°F (0.3°C to 0.6°C) lower	Least accurate method; takes longer to get a reading.

For more detailed information on different types of thermometers, including non-contact devices, you can consult FDA guidance on Non-contact Infrared Thermometers.

Conclusion: Interpreting Your Forehead Temperature

Ultimately, understanding what should the temperature be on your forehead? involves recognizing that normal is a range, not a single value. While a temperature between 97°F and 99°F (36.1°C and 37.2°C) is typical for adults, this can be affected by numerous factors. By using your thermometer correctly and being aware of these variables, you can interpret your readings with confidence. Always consider the person's overall health and symptoms when evaluating a temperature reading, and consult a healthcare professional with any concerns about a potential fever.

Frequently Asked Questions

No, a forehead temperature is generally slightly less accurate than an oral or rectal temperature because it measures surface skin temperature rather than core body temperature. It is, however, a very useful and convenient screening tool.

While the exact threshold can vary, a forehead temperature of 100.4° F (38.0° C) or higher is commonly considered a fever, especially in children. It is always wise to consult a doctor if you are concerned.

Always follow the thermometer's specific instructions. Ensure the baby's forehead is dry and that you hold the device at the correct distance. For infants, a rectal temperature is often considered the most accurate measure of core temperature.

Yes, sweating can significantly affect your reading. The body's cooling process through sweat can lead to a lower-than-actual temperature reading. It's best to dry the forehead before measuring.

A low forehead temperature can be caused by various factors, including a cool environment, sweating, or simply being naturally cooler. If accompanied by other symptoms like confusion or shivering, it could indicate hypothermia and warrants medical attention.

Yes, variations can occur between different brands and types of infrared thermometers. Some studies have noted significant differences in readings, so consistent use of one device is recommended for comparison over time.

You should seek medical help if a fever is accompanied by other severe symptoms like a stiff neck, severe headache, confusion, or difficulty breathing. For infants under 3 months with a forehead fever, a doctor should be consulted urgently.