What is the normal rectal temperature for adults?

The normal rectal temperature for adults typically ranges from 98.6°F to 100.4°F, with the average being around 98.6°F. Rectal temperatures are generally considered to be the most accurate reflection of core body temperature, especially in clinical settings. While 98.6°F is often cited as the standard average temperature, it is essential to recognize that variations can occur based on individual factors, time of day, activity level, and even the specific method of measurement.

A temperature of 99.6°F, while slightly elevated from the traditional average, falls within the acceptable range for a normal rectal temperature in adults and indicates a state of normal health without fever. Other temperatures, such as 97.6°F, would be considered on the lower end of normal, and 100.4°F would actually indicate a low-grade fever, which is not categorized as a normal temperature. Therefore, the choice reflecting 99.6°F aligns with the understanding of how body temperature can variably present within the normal range.