In outer space, the pressure is too low (vacuum) for water to remain or become liquid, so rain will not be possible. However, there may be Earth-like planets in the universe that have water or other liquids that can evaporate into the atmosphere and come down again as liquid (rain) after condensation.
Following on from Annes answer. Its possible that it rains on at least two celestial bodies other than Earth in the Solar System:
Venus: The atmosphere is so dense that even with the heat it may well rain Sulphuric Acid in the upper atmosphere.
Titan: The atmosphere is also dense but it is really cold here. Its likely that it rains Methane and that this forms puddles or little lakes on the surface!
But I wouldnt recommend “Singing in the Rain” in either case!
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