Excited state proton transfer (ESPT) is a fundamental process of immense biophysical interest and considering the heterogeneity existing in real biological environments we investigate the process in a bio-mimicking reverse micellar (RM) systems. We herein report a detailed study on the ESPT process of a photo-acid d-luciferin at different temperatures in RMs composed of: anionic AOT, cationic DDAB, and neutral Igepal-520 using steady state and time resolved fluorescence measurements. We found that with increasing temperature both solvation as well as the ESPT rate accelerate, however, the extent of the increase is RM specific, and they even not complement each other. Our study clearly identifies the pivotal role of solvation, specially in micro-heterogeneous environments, to guide the ESPT process.