What is 15 degrees Celsius in Fahrenheit? 15 c equals 59 f 59 Fahrenheit  The C to F formula is (C * 9/5) + 32 = F 15 x 9 = 135 15 / 5 = 27 27 + 32 = 59 15 degrees Celsius equals 59 degrees Fahrenheit. 15ctof 15c to f Celsius Fahrenheit [&hellip