Recently, climate change has led to significant changes in natural and human systems, production resources and economic activities. One of the best solution to prevent climate change crises is to use renewable energies, including solar and surface energy. Hence, in this study, it has annually and monthly analyzed mean incoming short and long-wavelength, net short and long-wavelength radiation for the period 1981–2010 using GLDAS model output data with 0.25 degree horizontal resolution. The results show that the mean short wavelength radiation is decreased from the Oman Sea coast toward the north. Moreover, the mean long wavelength radiation from the north and south coasts to the internal plateau is declined. Besides that, the mean net short wavelength radiation has reduced from south to north. Whereas it has maximum amount in the Mand, Bakhtegan, Helleh, Zohre, Siahkoh, Gavkhuni and southern areas of the Kavir-Markazi watersheds. The average net long wavelength radiation is increased in north and northwest and decreased in south east, in Meshkil, Jazmourian, Baluchistan and Bandar-Abbas watersheds too.