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Body temperature normally changes throughout the day and in adults, it is lowest in the early morning. ## Alternative Names Expand Section Normal body temperature; Temperature - normal ## Images Expand Section - [Thermometer temperature](https://medlineplus.gov/ency/imagepages/19700.htm) ## References Expand Section Blum FC, Biros MH. Fever in the adult patient. In: Walls RM, ed. *Rosen's Emergency Medicine: Concepts and Clinical Practice*. 10th ed. Philadelphia, PA: Elsevier; 2023:chap 8. Hall JE, Hall ME. Body temperature regulation and fever. In: Hall JE, Hall ME, eds. *Guyton and Hall Textbook of Medical Physiology*. 14th ed. Philadelphia, PA: Elsevier; 2021:chap 74. Sajadi MM, Romanovsky AA. Temperature regulation and the pathogenesis of fever. In: Bennett JE, Dolin R, Blaser MJ, eds. *Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases*. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 55. ## Review Date 1/1/2025 Expand Section Updated by: Linda J. 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Normal body temperature varies by person, age, activity, and time of day. The average normal body temperature is generally accepted as 98.6°F (37°C). Some studies have shown that the normal body temperature can have a wide range, from 97°F (36.1°C) to 99°F (37.2°C). A temperature over 100.4°F (38°C) most often means you have a fever caused by an infection or illness. Body temperature normally changes throughout the day and in adults, it is lowest in the early morning. Normal body temperature; Temperature - normal - [Thermometer temperature](https://medlineplus.gov/ency/imagepages/19700.htm) Blum FC, Biros MH. Fever in the adult patient. In: Walls RM, ed. *Rosen's Emergency Medicine: Concepts and Clinical Practice*. 10th ed. Philadelphia, PA: Elsevier; 2023:chap 8. Hall JE, Hall ME. Body temperature regulation and fever. In: Hall JE, Hall ME, eds. *Guyton and Hall Textbook of Medical Physiology*. 14th ed. Philadelphia, PA: Elsevier; 2021:chap 74. Sajadi MM, Romanovsky AA. Temperature regulation and the pathogenesis of fever. In: Bennett JE, Dolin R, Blaser MJ, eds. *Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases*. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 55. Updated by: Linda J. Vorvick, MD, Clinical Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.