This issue is one which throws _many_ students in their chemistry/physics classes. It deals with what is called equilibrium. Squarepeg mentioned one core observation: at less than 100% relative humidity, things like wet towels dry out. Relative humidity is the amount of water vapor in the air divided by the maximum it could be between drops in fog...relative to how much water there could potentially be until it sticks to itself and drops out as rain or cloud. The actual proportion of water in honey at equilibrium with air of some relative humidity does not follow a 1:1 numerical relationship. Otherwise at 60% relative humidity (a relatively dry-feeling atmosphere) your towel would be 60% water. Soggy, and counter to your known experience. A 10% relative humidity arid-arid-arid environment would not give your towel 10% water.
Honey exposed to air has a certain affinity for water. So does your towel. Neither has an outstandingly high affinity for it. A drop of water on a clean surface will totally evaporate and leave a dry surface behind in a 60% relative humidity atmosphere. Honey will keep 18% or so water content, according to Squarepeg's quoted value. But try some Calcium Chloride, and it will suck the water out of the air and liquify itself ("deliquescence;" if you look you can see the "liq"uid in the word). The water vapor "sticks" to the Calcium Chloride, and eventually enough stays behind to dissolve an initially dry pile of the material. Different materials have different affinities for water. If you put a pile of Calcium Chloride in the same room with some honey, it will suck the water out of the air, and as that dry air circulates near the honey, it will let some of the water evaporate out of the honey. The equilibrium content is a balance between what evaporates from the honey into the air and what sticks to the honey when it's bouncing around between air molecules and happens to hit the honey. If there's not a lot of water in the air, what leaves the honey won't return.
Michael