What Is 100°F in Celsius?
100 degrees Fahrenheit is 37.7778 degrees Celsius.
How to Convert Fahrenheit to Celsius
To convert degrees Fahrenheit to degrees Celsius, subtract 32, then multiply by 5/9.
For example: 75 °F − 32 = 43, and 43 × 5/9 = 23.8889 °C.
Where You Meet This Number
A hundred degrees is the psychological threshold in American weather reporting, the number that turns a hot day into a news story. It also sits just above body temperature, which is why it is searched for both reasons.
A Phoenix forecast of 100 °F is 37.8 °C, a figure that would make headlines anywhere in Europe.
What People Get Wrong
Because 100 °F is barely above normal body temperature, a thermometer reading of 100 °F is a mild fever rather than a dangerous one — but an air temperature of 100 °F is genuinely risky for prolonged exertion.
Weather Temperatures in Fahrenheit and Celsius
| Degrees Fahrenheit (°F) | Degrees Celsius (°C) |
|---|---|
| 60 | 15.5556 |
| 70 | 21.1111 |
| 80 | 26.6667 |
| 85 | 29.4444 |
| 90 | 32.2222 |
| 95 | 35 |
| 100 | 37.7778 |
| 105 | 40.5556 |
| 110 | 43.3333 |
| 115 | 46.1111 |
| 120 | 48.8889 |
About These Scales
Degree Fahrenheit
On the Fahrenheit scale water freezes at 32 degrees and boils at 212 degrees, so one Fahrenheit degree is 5/9 the size of a Celsius degree. It remains the standard scale for weather, ovens and body temperature in the United States.
Degree Celsius
The Celsius scale puts the freezing point of water at 0 degrees and its boiling point at 100 degrees at sea level. It is the everyday temperature scale in nearly every country except the United States.
Definitions follow The SI Brochure, BIPM. See how we calculate for the exact values and rounding rules.
Frequently Asked Questions
Is 100 °F a fever?
It is just above normal. Most sources put the fever threshold at 100.4 °F (38 °C), so 100 °F is borderline.
What is 100 °F in kelvin?
100 °F is 310.928 K, a shade above normal body temperature.
Is 100 °F dangerous weather?
It can be. At 37.8 °C the body cools almost entirely by sweating, so humidity and hydration matter more than the number itself.
What is 110 °F in Celsius?
110 °F is 43.3333 °C, a temperature reached in desert climates.