Yes I think that works
Pioggia supposedly means rain or shower. So why is "My son plays in the shower" incorrect?
FritzNeal: In English 'shower' has two meanings: an ourdoor rain shower -- pioggia -- and an indoor bathroom shower -- doccia. So your English sentence is open to misinterpretation. The way it's written I'd take it to mean he's playing under the indoor bathroom shower. I suspect that's why your answer was marked wrong.