See the steps to find the temperature of 28 degrees Celsius in degrees Fahrenheit below. To convert 28 °C to °F, you can use a widely accepted conversion formula: 28 °C × 9/5 + 32 = 82.4 °F. Thus, 28 degrees Celsius times 9 divided by 5 plus 32 is equal to 82.4 degrees Fahrenheit.