IPA: /ˈwɛðərˌmæn/
KK: /ˈwɛðərˌmæn/
A person, usually a man, who gives information about the weather and predicts what it will be like in the future.
The weatherman said it would rain tomorrow.
Weatherman → It is formed from "weather" (from Old English *weder*, meaning atmospheric conditions) and "man" (from Old English *mann*, meaning a person). A weatherman is a person who reports on atmospheric conditions.
Think of a person who studies and reports on the 'atmospheric conditions' ('weather') — that's what a weatherman does.