Q:

Is it possible to omit the verb in Futur I?

When using to future tense with an adjective, is it possible to omit the auxiliary verb?
My examples are:

Es wird regnerisch oder sonnig, das hängt vom Wetter ab.
Es wird regnerisch oder sonnig sein, das hängt vom Wetter ab.

The first example doesn’t sound odd to me.

A:

In the first sentence, wird is the main verb; and technically, it does not use future tense. (Future tense would be “Es wird regnerisch oder sonnig werden, …”, with the first wird now being the auxiliary verb.)
In the second sentence, sein is the main verb, and wird is the auxiliary verb.
A mostly literal translation into English would be:

It becomes rainy or sunny, … (better: It turns rainy or sunny, …)
It will be rainy or sunny, …

