Tropical rainy climatic group characterises the climate of those regions that experience persistent high temperatures throughout the year and the temperatures normally do not go below 18°C even in the coolest month. There are two climatic types, which fall under this group, tropical monsoon rain forest and tropical wet dry climate.

Tropical monsoon rain forest areas include the west coastal lowlands, the Western Ghats and southern parts of Assam. High temperatures throughout the year, even in the hills, characterize the climate of these regions. The rainfall here is seasonal, but heavy and is above 200 cm a year. Most of the downpour is experienced in the period from May to November, and is adequate for the growth of vegetation during the entire year. December to March is the dry months with extremely scanty rainfall. The heavy rain is responsible for the tropical wet forests in these regions, which consists of a large number of species of animals.

Tropical wet and dry climate is another classification of this particular climatic group. Majority of the plateau of peninsular India enjoys this climate, except a semi-arid tract to the east of the Western Ghats. Winter and early summer are long parched periods with temperature above 18°C. Summers are usually very hot and the temperatures in the interior low level areas can go above 45°C during May. The rainy season is from June to September and the annual rainfall is between 75 and 150 cm. Only the state of Tamil Nadu receives rainfall during the winter months of October to December.

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