I have 3 of these. They work WONDERS! My computer room is nice and DRY. Also keeps my gun safe moisture free.
But yes, rain is causing the humidity in your room to increase,
Haha oh I don't blame you! It was a process of trying, then realizing they were not strong enough, and returning. They started really small, and just got a couple inches bigger each time! This is the one I ended up sticking with. Brand is a really well known one too.. As a warning it does beep really loud when you turn it on, or switch to high/low mode or turn on/off the lights. I just leave it on low, and leave the light off. It heats my enclosure up about 3-5 degrees or so on low. https://www.amazon.com/dp/B08R55SD6Y?ref=ppx_pop_mob_ap_share
SEAVON Dehumidifier 35oz... https://www.amazon.com/dp/B08R55SD6Y?ref=ppx_pop_mob_ap_share
amazon has them starting at fifty bucks us.