Fitzgerald uses weather, specifically contrasting rain, gloom, and darkness with sunshine, light, and happiness throughout the book. Five significant quotes dealing with the weather in F. Scott Fitzgerald's The Great Gatsby include Nick’s thoughts at the beginning of the book:
And so with the sunshine and the great bursts of leaves growing on the trees—just as things grow in fast movies—I had that familiar conviction that life was beginning over again with the summer.
This is an allusion to how Gatsby will attempt to restart his life to include Daisy. It is also a commentary on how the sunny day makes Nick feel positive about his own outlook on life as he embarks on his post-college adulthood.
Other significant quotes dealing with the weather occur during the scene in which Gatsby has asked Nick to arrange a tea party with Daisy. Gatsby is excited by the prospect of seeing Daisy, but the weather is ominous and forebodes the ultimately negative outcome of their renewed relationship. Fitzgerald writes,
The day agreed upon was pouring rain.
Despite the “pouring rain,” Gatsby is nervous about appearances. He wants everything to look perfect when Daisy sees his home and his grounds. Even in the rain he sends a gardener over to mow Nick’s lawn. Gatsby deludes himself into believing that the rain will stop, which implies his self-delusion about how he can steer his life to realize his dreams.
One of the papers said they thought the rain would stop about four. I think it was "The Journal."
The rain is symbolic of several things. First, as noted, it foreshadows the rain that will fall on Gatsby’s relationship with Daisy and, in fact, on Gatsby’s life as a result of his obsession with her. In more mundane terms, it also signifies that it will ruin their tea party that day. However, the rain stops briefly.
"It’s stopped raining."
"Has it?" When he realized what I was talking about, that there were twinkle-bells of sunshine in the room, he smiled like a weather man, like an ecstatic patron of recurrent light, and repeated the news to Daisy.
The news that the rain has stopped prompts joy for both Daisy and Gatsby, but it is short-lived. Finally, after Gatsby has died, Nick thinks about him in terms of rain, which is a symbol again of the rain or heartache that fell on his brief life.
Dimly I heard someone murmur, "Blessed are the dead that the rain falls on," and then the owl-eyed man said, "Amen to that," in a brave voice. We straggled down quickly through the rain to the cars.