The rainy season  (also called monsoon season, humid season or wet season), is a term commonly used when describing the weather in the tropics. The year is split into the dry season and the wet season . As the name implies, nearly all the rainfall in a year occurs during the wet season. Typically, days start off hot and sunny, with humidity building during the day and culminating in large thunderstorms and torrential rain in the afternoon or evening. This promotes plant growth.