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How to find a rainbow Rainbows need two key ingredients: moisture in the atmosphere, and sunlight. Your best chances of seeing a rainbow are during or right after a rainstorm. You don't need to get rained on to see a rainbow (although it certainly doesn't hurt your chances)—as long as there is rain falling nearby, you might see a rainbow. Conditions most conducive to rainbow formation are a period of rain followed by sudden clearing in the direction of the sun. If sunlight breaks through…