The d --> d electronic transitions of Mn(H2O)62+(aq) were studied over the temperature range of 25-250-degrees-C in a solution of the perchlorate salt. The crystal field parameter 10Dq was found to decrease by about 1000 cm-1 while the Racah interelectronic repulsion parameters B and C remained fixed with increasing temperature. The Mn-O bond distance was found to increase by 3 +/- 1% over the temperature range studied.