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AhaBulb: Stuff Everyone Should Know · ahabulb.com/fever-temperature

What temperature is generally considered a fever?

100.4°F or higher.

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  1. 99°F
  2. 100.4°F ✔
  3. 102°F

Why: Many health organizations use 100.4°F as the standard fever threshold.

Huh, didn't know that: A thermometer is more reliable than guessing by touch.

The dad joke
Why did the thermometer get promoted? It had degrees.
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References

Answer: 100.4°F. Many health organizations use 100.4°F as the standard fever threshold.

  1. CDC: Definitions of Signs, Symptoms, and Conditions of Ill Travelers www.cdc.gov/port-health/php/definitions-symptoms-reportable-illness
    For the purpose of this guidance, a measured temperature of 100.4°F [38°C] or greater
    Checked 2026-10-09.

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