80 °F at a glance
- Celsius
- 26.67 °C
- Exact fraction
- 26 2/3 °C
- Kelvin
- 299.82 K
- Rankine
- 539.67 °R
- Rounded
- 27 °C
- Quick estimate
- 25 °C
How to convert 80 °F to Celsius
(80 − 32) × 5/9 = 48 × 5/9 = 240/9 = 26.67 °C
Subtract 32 first because the two scales put zero in different places, then multiply by 5/9 because a Fahrenheit degree is only 5/9 the size of a Celsius degree. 48 is not a multiple of 9, so the exact answer is the repeating decimal 26 2/3 °C.
Estimate it in your head
Subtract 30 and halve: (80 − 30) ÷ 2 = 25 °C. That is 1.7 degrees low, close enough to decide what to wear.
How hot 80 °F feels with humidity
From 80 °F up, the National Weather Service adds humidity to temperature to estimate how hot it feels, the heat index. At 80 °F (26.67 °C):
| Relative humidity | Heat index | NWS category |
|---|---|---|
| 40% | 80 °F | Below caution level |
| 60% | 82 °F | Caution |
| 80% | 84 °F | Caution |
Heat index values assume shade and a light wind; full sun can add up to about 15 °F. Drink water before you feel thirsty and plan strenuous work for early morning.
Temperatures near 80 °F
| Fahrenheit | Celsius | Kelvin |
|---|---|---|
| 75 °F | 23.89 °C | 297.04 K |
| 76 °F | 24.44 °C | 297.59 K |
| 77 °F | 25 °C | 298.15 K |
| 78 °F | 25.56 °C | 298.71 K |
| 79 °F | 26.11 °C | 299.26 K |
| 80 °F | 26.67 °C | 299.82 K |
| 81 °F | 27.22 °C | 300.37 K |
| 82 °F | 27.78 °C | 300.93 K |
| 83 °F | 28.33 °C | 301.48 K |
| 84 °F | 28.89 °C | 302.04 K |
| 85 °F | 29.44 °C | 302.59 K |
Going the other way: 27 °C in Fahrenheit is 80.6 °F.
Frequently asked questions
What is 80 °F in Celsius?
80 °F is 26.67 °C: subtract 32 (48) and multiply by 5/9.
Is 80 °F hot or cold?
80 °F is hot, and humidity can make it feel hotter.
How do you convert 80 °F to Celsius in your head?
Subtract 30 and divide by 2: (80 − 30) ÷ 2 = 25 °C, compared with the exact 26.67 °C.
What is 80 °F in Kelvin?
80 °F is 299.82 K. Convert to Celsius (26.67 °C) and add 273.15.