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"Regnen" in German is a verb, while "bewölkt" is an adjective. Since you need a verb to make a complete sentence, you add "ist"

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To add on to the response: The verb corresponding to "bewölkt" is "sich bewölken".

So you could say

"Der Himmel bewölkt sich." = The sky is getting cloudy.

or

"Es bewölkt sich." = It is getting cloudy.

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"Es regnet" vs "Es ist bewölkt" | Spyke