Why use “ist” in one but not the other?
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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.
“Regnen” in German is a verb, while “bewölkt” is an adjective. Since you need a verb to make a complete sentence, you add “ist”
Ahhh, thanks. That’s confusing, since in English they both have “is”. It is raining. It is cloudy.
