Question

Why sky appears white to our eyes on hot days

Answer 1

due to light produced by the sun because it reflects from sky and reaches to our eyes

Answer 2

Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time. Closer to the horizon, the sky fades to a lighter blue or white.