Wow-that's quite a tall order. Have you read through the book and tried to find some yourself? To clarify, a simile is when you compare two things using the words like or as. Look to the very beginning of the book, when Montag meets Clarisse, and you will be able to find quite a few; Bradbury waxes quite poetical when describing Clarisse. I'll jot down a couple, to get you started. In describing Clarrisse's face after Montag gets home after meeting her for the first time, Bradbury writes,
"She had a very thin face like the dial of a small clock seen faintly in a dark room in the middle of the night...with a white silence and a glowing, all certainty and knowing."
This relays the fact that Montag feels assured and comforted by Clarisse; she is knowing, and a beacon of assurance in a dark world. Bradbury goes on with another simile for Clarisse's face: "how like a mirror, too, her face," meaning that she had the ability to help people see themselves for who they really are. Again, on Clarisse:
"she was like the eager watcher of a marionatte show, anticipating...before it began,"
meaning that she is an observer of their world, curiously watching what is going on, and able to understand everyone's movements. Bradbury uses similes all throughout his novel, and if you keep your eyes open for them, they almost always convey a deeper symbolism for the characters and the moments they experiences. Keep flipping through the pages; he uses them to describe Mildred also, and there are quite a few at the end of the book. I hope that helps a bit!