How hot surface of the sun?

The surface of the Sun, known as the photosphere, has an average temperature of about 5,500 degrees Celsius (9,932 degrees Fahrenheit). This intense heat is a result of nuclear fusion occurring in the Sun's core, where temperatures reach approximately 15 million degrees Celsius (27 million degrees Fahrenheit). The energy produced in the core radiates outward, heating the outer layers and emitting the light and heat that sustains life on Earth.