The tourism industry is influenced by many sectors due to its multidimensional nature. The most important factors in effective development and stability of tourism are considered to be climate factors especially temperature. The present study aims at probing the variations in the mean temperature and two factors of minimum and maximum temperatures in the north-western highlands of Iran as well as their impacts on tourism. In this study, an approach based on applications is taken by employing a descriptive-analytical method. The statistical data were provided by the Iranian national meteorological organization (IRIMO). The obtained data were analyzed by linear regression method using MATLAB. The mean temperature and variation maps were obtained using Surfer software which exhibit the meaningful variations by color. The final results indicate mean temperature variations as well as trends in two factors of maximum and minimum temperatures all over the studied region. The highest positive variations were found during June, July and August. Moreover, an increasing trend in some areas with meaningful variations were found in January, February and March. These variations show the extended warm tourist season and shortened cold tourist season in the region. Generally, a uniform pattern of meaningful trends was not found in the area. It seems that the temperature trends in uplands and low-lying lands follow different rates and this region shows a different pattern of temperature trends due to its general temperature and environmental conditions such as topography.