This is the 11903rd most frequent Spanish word.
húmedas
"Damp" or "moist."
Here, "húmedas" describes the state of the towels being slightly wet or damp after use.
Las toallas están húmedas después de usarlas.
The towels are wet after using them.
In this sentence, "húmedas" expresses the wet state of the tree leaves after rainfall.
Las hojas de los árboles lucen húmedas por la lluvia.
The leaves of the trees look wet because of the rain.
"Húmedas" here refers to the characteristic of the nights being damp or having high humidity due to the climate.