I plan to support as many planets as possible where weather would make sense! Lignumis will be one of them eventually. As for now, I'm looking into ways to have dynamic weather. No promises that it'll be done anytime soon, though. Still new to modding and I have a lot to learn!
If you have any ideas for what I could add to Maraxsis, I would love to hear them! Myself I wouldn't know what to add there, at least right now. And Cerys, being an airless body, couldn't have a lot of weather effects.