do or be ?

[jennie77]

Some people predict the weather without consulting the weatherman. Instead of using fancy equipment, they forecast the weather by looking at other things. For years there has been an old saying about clouds. Clouds with the shape of a horse's tail, or clouds that look like the pattern on the back of a certain fish, mean that stormy winds will blow soon. People also use animals to predict the weather. When a cow lies down, rain is expected. Of you don't have a cow, look at a dog. Other people believed that when a dog eats grass, it will rain. Some people have even used plants to tell what the weather will do. For example, they say that a daisy shuts its eyes before it rains. Of course, looking at a flower to forecast the weather is about as scientific as predicting the length of winter by watching a groundhog. At least he is right soem of the time.

Usually we say "What's the weather like?"
Then is it alright to use "do" in the highlighted clause?
If it is alright, is there any special purpose with using "do" here?

Thank you in advance.

[Bridget]

What will X do?
X will do Y.

Prediction. Perfectly fine usage.

What will X be like?
X will be Y.

Prediction. Perfectly fine usage.

[Marius Hancu]

what the weather will do: how the weather will proceed

is OK

[OddThomas]

When we use do, we give the weather animate qualities, and allow it to act as if it had its own motive spirit. On its own, the weather will then do things, won't it? We wonder, or forecast, what it will do next.

When we use be, we are not emphasizing animate qualities, so we then must ask or say what the weather is like, in a stative sense.