The conversion
30°C = 86°F
°F = (°C × 9/5) + 32, so (30 × 9/5) + 32 = 86.
As an outdoor air temperature, 30 °C 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.
| Celsius | Fahrenheit |
|---|---|
| 25 °C | 77 °F |
| 26 °C | 78.8 °F |
| 27 °C | 80.6 °F |
| 28 °C | 82.4 °F |
| 29 °C | 84.2 °F |
| 30 °C | 86 °F |
| 31 °C | 87.8 °F |
| 32 °C | 89.6 °F |
| 33 °C | 91.4 °F |
| 34 °C | 93.2 °F |
| 35 °C | 95 °F |
The other direction
86 °F converts back to 30 °C, which is the same relationship read the other way. Going from Fahrenheit to Celsius, subtract 32 first and then multiply by 5/9 — doing it in the other order is the usual mistake and produces a plausible-looking wrong answer.
The full converter handles any value, in either direction, including kelvin, and shows the formula as it works.