For several years, hydrology has required a holistic theory of space-time evolution of mesoscale tropical rainfall which would allow us to take advantage from it to its application in water resources engineering.Nevertheless, various efforts have covered many techniques from the deterministic to stochastic models but not one gives a complete and satisfactory answer to how rainfall behaves in all its space-time scales and even more how its emerging patterns change.This article reviews some facts that show multifractality is an intrinsic property of rainfall and a coupled theory between multifractal theory and stochastic processes could lead us to a better understanding of tropical rainfall and its forecast.