Ideas
This has started happening for me as well - which annoys the living daylight out of me. I also had to disable weather affects on sims - because apparently, sims just randomly go out swimming or falling asleep on a pool floatie in the middle of the winter -.-
But honestly, this raining/snowing inside the house bug is ridiculous. When i first saw so many people had this issue, i felt truly sorry for them - because i've been lucky and haven't had it happening to me at all, but now it has - and yes, i know i can turn off weather - but then the point of the Seasons EP is completely gone. I like to have the realism of weather, and as many before me have written: we've payed for this DLC and shouldn't have to disable it as a work-around. It is totally unacceptable. 😒