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The present study aims to evaluate the influence of climate conditions on tourism in the port of Chabahar, southeastern Iran, using the climate comfort indices (CIT, PMV, and TCI) and the field data relative to the tourist satisfaction. According to the computed TCI, the autumn-winter season (October-April) is climatically favorable for tourism in Chabahar, but it is ideal during January to March. Based on the computed PMV index, the studied region is in the range of climate comfort in most parts of the year. However, when the PMV thermal comfort limits (− 0.5 < PMV < 0.5) and the PPD limits (0 < PPD < 10) are considered, only the March and November are included in the thermal comfort range. The CIT index also indicates that all months of the year are acceptable for tourism that does not coincide with the reality of the region. However, by blending the PMV and the tourist’s degree of satisfaction, a slight modification was made to the CIT index to better represent the reality of the region regarding the climate comfort. The modified CIT gave a different result, reflecting the importance of tourists’ perceptions in defining the climate comfort rather than merely relying on the climate variables. The modified CIT also suggests November-March as a period with favorable to ideal climate condition for tourism in Chabahar which is a more realistic assessment of climate condition of the region as perceived by the tourists interviewed. [ABSTRACT FROM AUTHOR]