Spatio-temporal average rainfall erosivity factor map has been generated for India. This study on rainfall erosivity makes use of 101 years monthly rainfall data and 52 spatial points. The results presented here provide the much needed guidance to remove ambiguities regarding the rainfall erosivity factor in the Indian context. This study has a variety of applications in erosion prediction technology, such as Universal Soil Loss Equation or Revised Universal Soil Loss Equation, or in rainfall-data-deficient regions. In-depth observations can develop a deeper understanding of rainfall variation to estimate the erosivity factor. Rainfall erosivity factor map can facilitate agriculturists and soil conservationists to identify rainfall erosivity potential at diverse locations, and thereby apply obligatory safety measures to minimize soil erosion. The rainfall erosivity factor map has been used to provide a more rational value of the average rainfall erosivity factor covering India, in regions where rainfall distribution patterns is of the same order. © 2015 IAHR and WCCE.