The word(s) "sky" appears 53 time(s) in 51 verse(s) in Quran in Muhammad Pickthal translation.

(41) And Who sendeth down water from the sky in (due) measure, and We revive a dead land therewith. Even so will ye be brought forth;

(42) But watch thou (O Muhammad) for the day when the sky will produce visible smoke

(43) And the difference of night and day and the provision that Allah sendeth down from the sky and thereby quickeneth the earth after her death, and the ordering of the winds, are portents for a people who have sense.

(44) Have they not then observed the sky above them, how We have constructed it and beautified it, and how there are no rifts therein?

(45) And We send down from the sky blessed water whereby We give growth unto gardens and the grain of crops,

(46) And the sky He hath uplifted; and He hath set the measure,

(47) He it is Who created the heavens and the earth in six Days; then He mounted the Throne. He knoweth all that entereth the earth and all that emergeth therefrom and all that cometh down from the sky and all that ascendeth therein; and He is with you wheresoever ye may be. And Allah is Seer of what ye do.

(48) The day when the sky will become as molten copper,

(49) He will let loose the sky for you in plenteous rain,

(50) And when the sky is riven asunder,