Rain effect never goes away in the end, as if it was always raining. Doing "/weather clear" doesn't have an effect.

I can't reproduce this. Do you have any other mods that might be causing this?

Yes I'm using bettermc mod pack with this mod slapped on top. It's the latest 1.19.2 version

Cannot reproduce this in 1.19.2 either. Please remove your other mods and test again. If it's one of your other mods causing this you should report it to them.