What does 7% of the weather forecast mean?

it means that there is a 7% probability of precipitation. According to the query of China Meteorological Bureau, the percentage in weather forecast usually refers to the precipitation probability or relative humidity, and the precipitation probability refers to the percentage of the possibility of precipitation in a certain period of time. 7% of the weather forecast means that there is a 7% probability of precipitation. Weather forecast is a pre-estimation and forecast of weather changes in the future.