"It's pouring" is a common expression used to describe heavy rainfall. There are many synonyms for this phrase that can add variety and interest to your conversations or writing. Some options include "it's raining cats and dogs," "it's bucketing down," "it's coming down in sheets," "it's a deluge," "it's a downpour," "it's a cloudburst," or "it's a monsoon." Each of these phrases conveys the intensity and volume of the rainfall in a unique way. Experiment with using different synonyms for "it's pouring" to keep your language fresh and engaging.