Sky/skaɪ/ Definition 1 of 5Pro Tip 1/3Weather Indicator The color or look of the sky can indicate weather conditions. A grey sky often means it's going to rain. Pro Tip 2/3Natural Beauty The sky is often associated with beauty in poetry and art. Painters love capturing the sky at sunset. Pro Tip 3/3Time of Day Sky's appearance helps indicate time of day; bright for day, dark for night. The sky turns orange as the sun sets.