My father taught me this rhyme:
Red sky at night,
sailors delight;
red sky in morning,
sailors take warning.
Cf. Jesus' response to the Pharisees and Sadducees, when they asked him for a sign from heaven (Matthew 16:2-3 KJV):
When it is evening, ye say, It will be fair weather: for the sky is red.
And in the morning, It will be foul weather to day: for the sky is red and lowering.
ὀψίας γενομένης λέγετε· εὐδία, πυρράζει γὰρ ὁ οὐρανός·
καὶ πρωΐ· σήμερον χειμών, πυρράζει γὰρ στυγνάζων ὁ οὐρανός.
Bruce M. Metzger,
A Textual Commentary on the Greek New Testament (Stuttgart: United Bible Societies, 1975), p. 41: