It is important to right a correct statement that one can understand. Va a llover hoy is written correctly.
There are different kinds of Spanish words that are often used in a sentence. Va a llover hoy is a Spanish word that means it's going to rain today.
<h2>Complete sentence</h2>
In Spanish, a complete sentence is one that always have or implies that there is a subject and a verb in the sentence and it does make a complete sense.