Ashadha or Aashaadha or Aadi is a month of the Hindu calendar that corresponds to June/July in the Gregorian calendar. The Tamil month Aadi is the fourth month of the Tamil Calendar and begins on July 16th, 2012. Aadi Perukku is a unique South Indian and specially a Tamil festival celebrated on the 18th day of the Tamil month of Adi (mid July). Aadi month(July 17th - August 16th) is the 4th month of the Tamil Calender. July 15th to August 15th is called the month “Aadi”. Why? “Aadi is a month that is dedicated to the goddess.