The story is set in Venus sometime in the future on a day when the rain stops briefly.
A group of children are living on Venus. It rains every day for seven years. The children have not seen the sun in all that time. The children are nine years old, and have not seen the sun since it came out seven years before for an hour.
And this was the way life was forever on the planet Venus, and this was the schoolroom of the children of the rocket men and women who had come to a raining world to set up civilization and live out their lives.
A girl named Margot came from Earth, and remembers the sun. The other children are angry because she has seen it and they haven’t. On the one day the sun comes out they decide to lock her in a closet, and she misses the few minutes of sun.
The story demonstrates that children are children, no matter the setting. The children are cruel to Margot because she is different, and because they are jealous. Due to their actions, she misses seeing the sun. Only then do the children regret what they have done.