When it rains, rain falls in the house has a roof.
Edit By Crinrict: Adjusted Title to fit archived thread, Added tag.
Archived thread had around 187 me toos
Ideas
I wasn't having rain inside until suddenly I was. I'm not sure what triggered it. Been playing exclusively with a SM apartment - 1313 21 Chic Street - to watch the invisible litter. It rains in SM, so I think I would have noticed if it was raining inside. It started with a thunderstorm while visiting WC. Sim returned home to a thunderstorm in SM. Now I have rain inside.