Usage patterns
湿気が多いto be humid/damp (of weather or a place)
It's hard to get through this season because of the high humidity.
湿気を取るto remove moisture
I put a dehumidifying agent in the closet to remove the moisture.
湿気がこもるfor moisture to build up (in an enclosed space)
If you don't open the window, moisture builds up in the room.
湿気を防ぐto keep out moisture
This container is treated to keep out moisture.
湿気に弱いto be vulnerable to moisture (of a material)
This wood is vulnerable to moisture, so care is needed.