Fortune telling by observing substances in the air or wind, such as cloud shapes, weather conditions, and atmospheric phenomena (comets, etc.); austromancy: An aeromancy is divination that involves the direction of the wind like throwing sand or dirt in the wind after asking a question and receiving the answer in the form of the dust cloud, or throwing a handful of seeds into the air and receiving the answer to a question from the pattern created by the fallen seeds.

For many centuries, humans believed that the wind was actually the breath of their deities. Alternately, some thought that specific types of winds, particularly hot winds, were the work of demons.

In medieval writings on divination, the term aeromancy (usually spelled "aerimancy") was expanded to include almost all phenomena occurring in the air, such as forecasting the weather.