What color is the Sun?

For our purpose of determining the temperature of the surface of the Sun, a more precise answer is that the intensity versus wavelength curve for sunlight peaks near 500 nm.

But the question "What color is the Sun?" raises an interesting issue that is more closely related to biology and psychology than to physics. Physically, sunlight is a mixture of photons of different wavelengths. This particular mixture is very close to the color we call white. This is particularly true if we put back the predominantly blue light that is scattered out of a sunbeam as it comes from the Sun and passes through the Earth's atmosphere before it reaches our eyes. Why do we call this color white? Presumably, it is because after many hundreds of millions of years of evolution, our eyes and brains are adapted to viewing things that are illuminated with this particular mixture of photons. Then when humans started giving names to colors, they chose a special name for the special mixture that their eyes and brains were adapted to seeing.