The two most important parameters that affect the climate of each Immediately area are temperature and precipitation, whose variations affect different fields such as agriculture, energy, tourism and so on. The purpose of this study is to investigate the temperature and precipitation changes in three selected and index stations on the Seymare Basin. For this purpose, atmospheric general circulation models and scenarios were used from the CMIP5 models under the two scenarios RCP45 and RCP85 which were scaled using LARS-WG statistical model. Then to For evaluating the uncertainty of the models and scenarios, the output of models in the future (2021-2040) and based period (1980-2010) were compared by monthly statistical indices, coefficient of determination (R²) and Root Mean Square Error (RMSE) and the best models and scenarios for producing temperature and precipitation data were selected for the period 2021-2040. As the results, the HADGEM-2 model under PRC4.5 scenario was used for maximum and minimum temperature parameter and the same model under PRC 8.5 scenario for precipitation parameter. The results of this study showed that the average precipitation in the basin will decrease by 4.5% on average, while the minimum temperature will be 1.5 ° C and the maximum temperature will be 2.17 ° C, The highest increase is due to the warmer months of the year. Notable is the disruptions of rainfall distribution and high temperature have significantly negative consequences than rainfall reduction.