The second half of the saying suggests ‘Red sky in the morning, shepherd’s warning.’ While a red sunrise means that the good weather system has passed, it doesn’t necessarily follow that bad weather is on the way.Ĥ. This means that if we see a lovely red sunset, there must be a clean front to the west and therefore the next 12 hours or so will be clear. It’s because the sun sets in the west and weather systems generally move in from the west.
There is a scientific basis in the old saying Red sky at night, shepherd’s delight.