All steam is dry steam when it leaves the surface of water by definition. Molecules of water must achieve sufficient kinetic energy to overcome the intermolecular forces of liquid water. Statistically, some molecules are able to achieve this at room temperature; so, water will evaporate. Immediately upon leaving the surface of water; however, those molecules begin to lose kinetic energy to the surrounding air and begin to condense. If they leave with only sufficient KE to depart the surface, ie 100 C, they will begin to condense immediately.
However, molecules do not go walkabout together from the surface. If it's steam, it's dry. T
