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All answers having "Rain" as clue:

3 Character Answers:

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HTO



4 Character Answers:

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ACID

AGUA

DROP

IRAN

POUR

SPIT

TEEM



5 Character Answers:

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DROPS

STEAM



6 Character Answers:

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PRECIP



8 Character Answers:

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DROPLETS

ELEMENTS

FORECAST



10 Character Answers:

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WINWEATHER



14 Character Answers:

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LIQUIDSUNSHINE



15 Character Answers:

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DROPSFROMTHESKY

WEATHERFORECAST