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How would be the weather like tomorrow?
It can be very easily considered right in everyday English or informal style. Since would is always the past tense of the modal verb will —which is only used for future— so logically its past tense, would, should be used for the past time, not the future (tomorrow, in here) grammatically.
Hence, I think this sentence has grammar issue(s). And I would say: "How will be the weather like tomorrow?"
You are correct. The sentence you've been told in your class is wrong. And it's wrong for more reasons than just "will" vs "would".
When asking about weather with will, we generally use "what", not "how".
There certainly are ways to use "how" but not with "will". An example is:
How is the weather looking for tomorrow?
This is a more informal version of the question, though.
Additionally, the verb is too early in the sentence. It needs to be after "the weather".
So, after making all of these corrections, your final sentence (the standard way to ask what the weather's like in the future) is:
What will the weather be like tomorrow?
