Is this sentence correct ? ( use of but)

"It is raining."

"It is just a little."

Combined as "It is raining, but just a little,".

Does the word " is " apply to both parts ( raining and just a little), making the structure parallel because both phrases share the same word. Is this construction indeed parallel? Or It's just a silly sentence.

It's drizzling or It's just a light rain is fine I think.

However, I want to say like " It's starting to rain( but not yet realized if it's gonna be heavy or light) but just a little. ( realized that it's just a light rain)

Since I'm not native, I can't tell if the sentence is correct.

"It's starting to rain but just a little."

Punctuation is required

A: "It is raining."

B: "It is - just a little." (The dash could be a semi-colon or even a comma.)

"It is = "It is raining

- just a little." = it is raining just a little.

just a little is an adverbial phrase modifying "it is raining."

However, I want to say "It's starting to rain but just a little. (In the sense of the weather has not decided if the rain's going to be heavy or light) (I can see that it's just a light rain or drizzle)

Correctly punctuated, your example is correct.