This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A heavy fall of rain.

n. a heavy rain

v. To pour down; rain heavily.

n. A pouring or streaming downwards; esp., a heavy or continuous shower.

n. A pouring down; especially, a heavy or continuous shower.

n. a heavy rain

"The trails were deep in mud, the long grass soaking, leaves overhead sending down random showers even in those moments when there was no actual downpour from the sky and the clouds looked like clearing."

rainfall    rain   

rain cats and dogs   

inundation    cloudburst    monsoon    wet    rainstorm    storm    deluge    torrent    rain   

cannonade    drizzle    squall    deluge    fusillade    thunderstorm    barrage    tempest    bombardment    gale