Our forefathers had devised numerous prayers to propitiate the deities and pray for rains. It is purely a matter of faith and belief that drives these prayers. Some of them are listed below:
1) Rishya Shringeshwara Temple (Rishya Shringa) at Kigga which is 9 kms from Sringeri in Karnataka. As per legends, the great sage Rishya Shringa is said to have performed penance and attained Samadhi here. As per the puranas, wherever the sage used to go, that place used to experience good rains and there would be no draught.It must be mentioned that the agumbe forest where Kigga is located is one of the wettest places in the south.
Sloka in Sanskrit:
Details in Tamil:
Chants for rain Mahaperiyava
2) Chanting of Vana Parva from the Mahabharata - One of the the Jagadgurus of Sringeri, Sri Sri Chandrasekara Bharati Maha Swamigal has mentioned that the Vana Parva of the Mahabharata has been encoded with Varuna Beejas and Varuna Mantras. Chanting of these chapters of the Mahabharata would serve as a prayer for rains.The book "Guru Krupa Vilasam" mentions an interesting incident in 1925 by Guru Pada Sekaran on the Vana Parva chanting and its effect.
The following is the extract of the article from Guru Kripa Vilasam (in Tamil)
Guru Kripa Vilasam Page 1
Guru Kripa Vilasam Page 2
Guru Kripa Vilasam Page 3
Guru Kripa Vilasam Page 4
3) Varuna Mantra Japa - This a very detailed procedure and there are lots of regulations to be followed like eating food without salt till the Japa is completed etc.
4) Chanting of Varuna Sukhta - Varuna Sukhta is a powerful mantra from the vedas for invoking the rain deity. This should be performed by people well versed in Vedas only.
5) Chanting of Azhi Malai Kanna Pasuram from Tiruppavai - This Tamil poem should be chanted in groups in dry lakes, river beds etc. in multiple groups. The poem is given below
aazhi mazhai(k) kaNNaa onRu nee kai karavEl
aazhi uL pukku mugandhu kodu aarthu ERi
oozhi mudhalvan uruvam pOl mey kaRuththu(p)
paazhiy am thOLudai(p) paRpanaaban kaiyil
aazhi pOl minni valamburi pOl ninRu adhirndhu
thaazhaadhE saarnga mudhaiththa sara mazhai pOl
vaazha ulaginil peydhidaay naangaLum
maargazhi neeraada magizhndhElOr embaavaa
Meaning: Oh Lord of the rains, who is as majestic as that of the beautiful sea, don't hesitate to dive into the ocean, collect as much water, rise to the sky and assume the colour of the Lord (black). As with the Lord, who has graceful and powerful shoulders, oh rain god, without any delay, shine like the discus that he holds in His right hand and resound to produce the same impact that occurs when the conch on his left hand is blown, instantly produce the rain as how the Lord will shoot his arrows, to allow us take bath during the vow and happily flourish and thrive in this world.
6) Purusha Mirugam Puja at Thiruvadavur - Purasha mirugam is known as Spinyx Egypt. It is commonly used as a vahanam in south Indian temples. It has the head of a Lion and body of a man.
Tiruvadavur temple is located near Madurai. Outside the temple there is this statue of the Purusha Mirugam. The locals perform puja to this for abundance in rains. This was followed in several temples in south India but now this practice is lost.
Spinx temple of Thirvathavoor Near Madurai
7) Chanting of Annapurna Ashtakam and Avahanthi Homam
Below are some videos to chant with mantras on rain.