Somessar temple is situated in the southern portion of Sri Sarangapani temple that means near portamari kulam. This temple is facing the southern side with a small Gopuram at the eastern portion near the entrance.
The architectural style and element of this temple resembles the Dravidian Architecture of 13th century of Chola period. Arumugam and Thenar Mozhi Ammal are the other deities located in this temple complex.
Importance: Moon worshipped Siva here and hence the name Someswarar. In the month of february and march on the day of Maham star, all 9 river goddess meet here. When they all come goddess embraces god out of fear. Hence the Siva is known by name Kayaroganar. The hanging (Uri) fell in this place so he is called as sikkaserar. Sambandhar sang hymns on siva.
The famous festival of Kumbakonam Mahamaham is associated with this temple. Several other minor festivals are celebrated each month here.