<b>Spatio Temopral Rain Fall Variation A Case Study of Western Part of Hunsur Taluk, Mysore District, Karnataka, India</b> The present study has been conducted to assess the spatial variations in rainfall in Hunsur taluk, Karnataka, India. In order to discuss spatial and temporal variations in rainfall, 5 rain gauge stations have been chosen to collect data for the years 1985 to 2005. Data have been collected mainly from the District Statistical Office, Mysore. These collected data have been used to examine year wise spatial variations of rainfall using ArcGIS. Co efficient of variation has also been computed to assess the area where average rainfall can be expected, in the future. The result shows that, the study area has fluctuations in rainfall and Hyrige raingage station received maximum annual rain, Hunsur tobacco research center received minimum annual rain and Undavadi received lowest annual rain fall. IDW, Interpolation technique. 1180-1189 Issue-6 Volume-1 Gangadhara G