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Wireless Sensor Network (WSN) supports different kinds of applications in distinct areas, such as military, health care, agriculture, home or industry automation and others. Generally, there are three models of WSN: continuous, on-demand and event-driven. In continuous model, sensors send data periodically to the sink. In on-demand model, sensors sense continuously, store the data and sends only when requested. In event driven model the sensors send data only when certain events occur. In this paper we have presented the implementation details of WSN based temperature monitoring application. The main feature of our network is to continuously monitor the temperature in the 128 node High Performance Computing Cluster for its smooth functioning. The wireless sensor node senses and transmits the current value of temperature to the base station. This paper explains about the various steps involved in the experimental implementation and maintenance of the temperature monitoring network for High Performance Computing cluster at Computer centre, IGCAR. The performance analysis of the network is also discussed.