"All Summer in a Day" is a short story by science fiction author Ray Bradbury. This story was originally published in 1959 in a Bradbury short story collection entitled, A Medicine for Melancholy.

The story is about a group of frolicking nine year old schoolchildren residing on warm, tropical Venus, which was colonized by "rocket men and women who had come to a raining world to set up civilization and live out their lives" at an unspecified time in the future. The thick atmosphere of Venus still exists at this time, and it is constantly raining. Therefore, seeing the sun is a very rare event, occurring only every seven years for just two hours.

Margot is a little girl who moved to Venus from Earth five years before the story takes place. She is described as "a very frail girl who looked as if she had been lost in the rain for years, and the rain had washed out the blue from her eyes, and the red from her mouth, and the yellow from her hair. An old photograph dusted from an album, whitened away; and if she spoke at all, her voice would be a ghost." She fondly remembers the sun and the way it looked and felt. She does not play much with the other children in the underground city where they live. She is an outcast because of her sensitivity and the fact that it is rumored that she may return to Earth next year.

The kids are jealous of Margot because she remembers the sun from her time on earth. They were only two years old when it was last visible from Venus and do not remember it. She almost has a nervous breakdown because she gets so sick of living with the relentless rain. For example, once when she was supposed to take a shower at school in the locker room, she refused to get wet. She clutched her hands over her head and screamed that the water must not touch her head.

Margot writes a poem about the sun: "I think the sun is a flower, That blooms for just one hour." She also describes it as "a penny" and a "fire in a stove." The other children do not believe her, and the class bully, William, starts to harass her physically and verbally. While the teacher is out of the room, he convinces the other children to lock Margot in the closet.

The teacher finally comes back. The sun is actually about to come out after seven years of rain, and the teacher takes the children outside to experience it. They finally see the blazing sun in the blue sky. In their astonishment and joy, they all forget about Margot. They run and play in the warm fresh air until the two hours are up. All at once, a girl starts to cry because she feels a raindrop in her hand. She sadly realizes the rain is returning. The thunder sounds, and the children run back inside. Suddenly, one of the children remembers Margot, still locked in the closet. They stand frozen realizing what they have done! The children walk slowly towards the closet and let Margot out. The precious sun has come and gone, leaving Margot still pale in gloom and darkness.

In this short story, it is shown how Margot's individuality makes her peers jealous. However, they eventually feel guilty when they realize what they did was wrong. This story also teaches its readers about the vicious qualities of discrimination by showing the unfair way Margot was treated.

A short film version of this story was made for television in 1982. In the movie, Margot has one friend and is never emotionally distraught. There is an expanded ending in which the children atone for their horrible act by giving Margot all the flowers they picked while the sun was out.

On the planet Venus, it rains almost constantly. A classroom full of young children are excited to hear that the rain will stop today, for just fifteen minutes. But they are also resentful of a new classmate from Earth, who remembers what it's like to see the sun. They lock her in a closet just before the sun comes out. Written by Mike Konczewski