Which winds bring rainfall to the Western Ghats ? Why is the Deccan Plateau relatively dry during the rainy season?

The moisture laden south-west monsoon winds from die Arabian Sea branch causes heavy rainfall to the windward side of the Western Ghats. The Deccan Plateau which lies on the leward side receives very little rainfall and hence remains relatively dry during ;he rainy reason. 

The Bay of Bengal Branch of the south-west monsoons brings heavy rainfall to the north-eastern region of India. The Himalayas prevent them from leaving India and divert these O west, through the Ganga Plains. The amount of rainfall received steadily decreases in the north- west direction and wind becomes dry. As a result, Punjab and Rajasthan get very little rainfall during monsoons. Punjab is the last state to receive the monsoon rains.