The conversion
81°F = 27.22°C
°C = (°F − 32) × 5/9, so (81 − 32) × 5/9 = 27.22.
As an outdoor air temperature, 81 °F sits in the warm band. The other scale is on the dial beside it in the app, so a reading like this needs no conversion at all.
Convert something else
68°F
The range either side
Neighbouring values, for when the number you actually wanted was a degree or two away.
| Fahrenheit | Celsius |
|---|---|
| 76 °F | 24.44 °C |
| 77 °F | 25 °C |
| 78 °F | 25.56 °C |
| 79 °F | 26.11 °C |
| 80 °F | 26.67 °C |
| 81 °F | 27.22 °C |
| 82 °F | 27.78 °C |
| 83 °F | 28.33 °C |
| 84 °F | 28.89 °C |
| 85 °F | 29.44 °C |
| 86 °F | 30 °C |
The other direction
27.22 °C converts back to 81 °F, which is the same relationship read the other way. Going from Celsius to Fahrenheit, multiply by 9/5 first and then add 32. Adding first is the usual mistake.
The full converter handles any value, in either direction, including kelvin, and shows the formula as it works.