Normal Body Temperature: What’s Healthy and What’s Not?

Have you ever wondered, “What is the normal body temperature?” or “Is 99°F a fever?” You’re not alone! Body temperature is one of the first signs doctors check to understand what’s going on inside your body. In this blog, we’ll explain everything you need to know about normal human body temperature, including what’s normal, what counts as a fever, and when you should be concerned — all in a simple, easy-to-understand way. 

What is the Normal Body Temperature? 

The normal body temperature for a healthy adult is typically 98.6°F (Fahrenheit) or 37°C (Celsius). But this is not fixed for everyone. It’s considered the average human body temperature, but there’s a range that is still considered normal. 

Normal Body Temperature Range 

• Oral (mouth): 97.6 – 99.6°F (36.5 – 37.5°C) 
• Axillary (underarm): 96.6 – 98.6°F (35.9 – 37.0°C) 
• Rectal (babies): 98.6 – 100.3°F (37.0 – 37.9°C) 
• Ear (tympanic): 97.8 – 99.5°F (36.5 – 37.5°C) 
• Forehead (temporal): 97.8 – 99.1°F (36.5 – 37.3°C) 

Body temperature may vary based on the time of day, physical activity, age, gender, and how it’s measured. 

Factors Affecting Body Temperature 

• Morning vs Evening: Lower in the morning, higher in the evening. 
• Exercise: Physical activity raises body temperature. 
• Age: Kids often have slightly higher temperatures than adults. 
• Menstrual Cycle: Women may see slight increases due to hormones. 

What is Considered a Fever? 

A body temperature above 100.4°F (38°C) is usually considered a fever. 

• 98.6°F – 99.5°F: Normal 
• 99.6°F – 100.3°F: Low-grade fever 
• 100.4°F – 102°F: Mild fever 
• 102°F – 103°F: Moderate fever 
• 103°F or above: High fever (see a doctor) 

What is Low Body Temperature? 

Below 95°F (35°C) is considered hypothermia. 

Common causes include cold exposure, hypothyroidism, malnutrition, and certain infections. 

Normal Body Temperature in Babies and Children 

Newborns: 97.5 – 100.4°F (fever at 100.4°F+) 

Infants (3–12 months): 97.5 – 100.3°F 

Children: 97.0 – 100.0°F (fever if 101°F+) 

Use digital thermometers and age-appropriate methods. 

How to Check Body Temperature 

• Oral: Most common for adults 
• Underarm: Convenient but less accurate 
• Rectal: Most accurate for infants 
• Ear: Fast and fairly accurate 
• Forehead: Quick but may vary 

Use digital thermometers for best results. 

Normal Body Temperature in Males vs Females 

• Males: 97.7°F to 98.6°F (36.5°C to 37°C) 
• Females: 98.2°F to 98.8°F (36.8°C to 37.1°C) 

Women may have slightly higher temperatures due to hormonal cycles (like ovulation). 

It’s completely normal for females to have higher resting body temperature than males. 

Key Points Recap 

• Normal human body temperature = 98.6°F or 37°C 
• Acceptable range = 97°F – 99°F 
• Fever = 100.4°F or higher 
• Low body temp = below 95°F 
• Varies with age, gender, activity, and time of day. 

FAQs on Normal Body Temperature 

Q. What is the normal body temperature in Celsius and Fahrenheit? 

A. 98.6°F or 37°C, with a normal range of 97°F to 99°F. 

Q. Is 99°F considered a fever? 

A. No, it’s still within the normal range. 

Q. What is a dangerously low body temperature? 

A. Below 95°F (35°C) — seek medical help. 

Q. How does body temperature change during the day? 

A. Lower in the morning, higher in the evening. 

Q. What’s the normal body temperature for a child? 

A. Between 97°F and 100.4°F depending on age and method. 

Q. Can stress affect body temperature? 

A. Yes, emotional stress can cause a slight rise. 

Q. How do I know if my thermometer is accurate? 

A. Use a digital thermometer and follow usage instructions. 

Final Thoughts: Know Your Normal 

Knowing your normal body temperature helps you catch warning signs early. Whether you’re checking for a fever or just monitoring your general health, knowing what’s normal for your body is essential. Temperature may vary slightly from person to person — and that’s okay! Stay aware, stay informed, and stay healthy.