Udayanapuram Subramanya temple is located around 2 km from Vaikom Mahadeva Temple in Kottayam District, Kerala. The 10-day temple festival is observed in such a manner that it ends with arattu on the Rohini nakshatra day in Vrischikam month. Another important festival held in the temple is the Thaipooyam in Makarm month.
The main murti of Subramanya or Muruga is around 6 feet tall from the base (peedam). The main upa devatas in the shrine are Ganapathy and Dakshinamurthy.
The annual chirappu in the temple is held in Makaram month.
It is said that a Chera king built a temple for Subramanya at Kumaranallor but Goddess Bhagwati occupied the shrine. A temple that was built for Goddess Bhagavati at Udayanapuram then became the shrine of Subramanya.
It is believed that Subramanya or Muruga at Udayanapuram temple is the son of Vaikkathappan (Shiva worshipped at Vaikom Mahadeva Temple). Based on this belief on the Arattu or final day of festival in Udayanapuram Temple, the koodi puja is held at Vaikom Mahadeva temple.
The Kezhshanti (assistant priest) at Vaikom Mahadeva temple is always the main priest at Udayanapuram Temple.
For finding relief to stomach related ailments, brinjal is offered in the temple.
Dhwaja Prathishta in the shrine is also held in Makaram month.