Is it an idiom to blow hot air head-on?

Hot air blowing on the face is an idiom. Hot air blowing on the face is an idiom to describe the hot weather. It's hot outside, and you can feel the heat wave as soon as you walk out of the room. This description is that hot air blows in your face. It was the hot air that hit my face. It's very hot and cold. The idiom is very common: sweating, hot air blowing on your face.