Why Does A Rainbow Appear After A Drizzle | Magic Rainbow Experiment. We're learning why does a rainbow appear after a drizzle and doing a fun growing rainbow STEM experiment. After a light rain or drizzle, a beautiful rainbow can appear. Although rain has a lot to do with it but so does the sunlight. Then after the rain slows down or stops, the clouds often move. And the sun peeks out. That is when amazing color happens.
