One of the most important foundations of tourism planning in different geographic regions, is the preparation of a tourism environment calendar, especially based on the regional climate. The role of the climate in attracting tourists in the tourism season is of great importance. In this study, to determine the climate-comfort of the ecotourists in Bushehr, the bioclimate indices used in the MEMI model and the More method, as well as the climatic parameters of air temperature, relative humidity, cloudy sky, wind speed, vapor pressure and radiant temperature of the environment was used during the time period of (1986-2015) and local time of 18: 30. Considering the long-term average of the above data, the values of PET indices (physiological temperature of the body), SET (standard effective temperature), and the effect of Tmrt (mean radiant temperature of the environment) on the two indices were calculated and compared using RayMan and SPSS softwares. Ecotourism climatme-comfort surveys on a daily basis show that the best time period for the presence of ecotourists in terms of picnic leisure activities on a daily basis is from (May 30 to June 15) and from (September 26 to October 25) and on the monthly basis of May, June and October, for swimming on a daily basis from (April 30 to May 21) and (August 26 to October 5) and on a monthly scale of May and September, and also for sailing from (April 30 to May 16) and (August 26 to October 5) and on the monthly scale of May and September. In terms of correlation, there is a positive and strong correlation between PET and SET indicators, and there is also a positive and strong correlation between PET, SET and Tmrt indicators, and the exponential regression between them in picnic activities, swimming and sailing is also directional.