During the period of the South-west Monsoon, Tamilnadu remains dry because it lies parallel to the Coromandal coast.Tamil Nadu Coast remains mostly dry as it falls in the rain-shadow area of the Arabian Sea branch and is parallel to the Bay of Bengal branch. Rainfall does not take place continuously. After a few days of rainfall, a short spell of dry days is quite common. Thus, the Southwest monsoon season spreads over June to September in most of parts of India.