We use both the definite and indefinite articles with an adjective, to describe a particular rain: He had to walk to work in a/the driving/pouring rain.
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goro But I've never heard people say "in a rain, in rains".Both are possible, but there would usually be a post modifier. That is, "rain(s)" would not come at the end of the sentence.
Grammar GeekOf course "He mowed the lawn in a rain" is off -- but that's not what was said.Did you mean " He mowed the lawn
He mowed the rain in a driving rain would be fine.