Why does the Sun appear yellow from Earth despite its peak radiation being in the green portion of the visible spectrum?

The atmosphere preferentially scatters the shorter, bluer wavelengths, enriching the transmitted beam with longer, redder wavelengths.

Although the Sun's surface temperature of approximately 6,000 K causes its peak emission to fall near the middle of the visible spectrum (green), it radiates strongly across the entire visible range (red, green, and blue). When this broad spectrum of light passes through Earth's atmosphere, the shorter wavelengths, particularly blue light, are scattered more effectively across the sky. This removal of blue light from the direct beam that reaches the observer leaves the remaining transmitted light slightly skewed toward the longer, redder wavelengths, resulting in the common perception of the Sun as yellow.