I want to ask about the wearher in The Great Gatspy?

I'm not sure what particular you are asking about the weather, but a general observation...

The following is from a website Great Gatsby Themes, Motifs and Symbols
"As in much of Shakespeare’s work, the weather in The Great Gatsby unfailingly matches the emotional and narrative tone of the story. Gatsby and Daisy’s reunion begins amid a pouring rain, proving awkward and melancholy; their love reawakens just as the sun begins to come out. Gatsby’s climactic confrontation with Tom occurs on the hottest day of the summer, under the scorching sun (like the fatal encounter between Mercutio and Tybalt in Romeo and Juliet). Wilson kills Gatsby on the first day of autumn, as Gatsby floats in his pool despite a palpable chill in the air—a symbolic attempt to stop time and restore his relationship with Daisy to the way it was five years before, in 1917."

Hope this helps!
~Lydia