# When it is evening
The situation can be stated more clearly. Alternate translation: "If the sky is red in the evening" or "If the sky is red when the sun is setting" (See: [[rc://en/ta/man/translate/figs-explicit]])
"When the sun is setting"
# fair weather
This means clear, calm, and pleasant weather.
# for the sky is red
As the sun is setting, Jews knew that if the color of the sky changes to red, it is a sign the next day will be clear and calm.