It comes from an expression: Red sky at night, sailor's delight;
red sky at morning, sailors take warning. Nautical folklore holds
that a red sky in the morning portends bad weather.
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If the sky is red at night it's going to be a calm day BUT if
there is a red sky in the morning it's going to be stormy or
rainy.
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Red Sky at Morning - 1971 is rated/received certificates of:
Finland:K-16
USA:GP
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Red sky at night, sailor's delight, Red sky in the morning, sailors take warning. (Another version says "shepherds" instead of "sailors")