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Here's an old country saying for judging the likely weather to come, that's actually a mnemonic rhyme:

" A red sky at night, shepherd's delight,
But a red sky int' morning, is a shepherd's warning... "

At sundown, an evening sky appears red in the west when thin high clouds are present to reflect the dying light. Such high clouds usually indicate a warm and dry night without rain the next day. However a reddish tinge in the sky towards sunrise usually indicates the opposite, due to lower clouds of a different nature. At sunrise the early presence of such clouds combined with an obvious rising temperature usually brings rain before too long!

According to Brewster's Dictionary the Italians also have a saying that is somewhat similar:

" Serra rosso et negro mattino
allegra il pelligrino "
("A red evening and a white morning rejoice the pilgrim")