Does the color of the cup affect the temperature of the water?

it depends on the color the water is in and if its in purple it would probally be hot but not that hot but say it was in a black containor it would probally be very hot. Two different ways to look at this question. The color of the water, or the color of the container its in. Lets do both. The clearer the water is and the lighter color the container is will result in passing sunlight to not hit anything and warm it up. Tainted water or muddy water and darker containers will warm up due to sunlight being absorbed. This will also effect evaporation rates as well. Inside the house, color makes no difference if not in direct sunlight.