This paper presents a preliminary report on the diurnal temperature evolution in Şugău Cave (located in the southwest part of Giurgeu Mountains, Suseni village, Harghita county, Romania), during summer tourism season. Hourly frequency of data covers the period of July 6 - August 31 2017, with highest tourist flows. Gemini Data logger sensors was set on the touristic gallery from the Entrance to the Music Hall (Sala Muzicii), which was designated as the main climatic alignment. In opposition, the sensor from the Great Hall (Sala Mare) is meant to capture the topoclimatic features unchanged by mass tourism. It is noted that the average daily temperature in Music Hall (7.32 ºC) is a little bit higher than that recorded in Great Hall (7.231 ºC) a difference due to the presence of tourist activity. Daily temperature values from Music Hall show multiple and non - periodical variation, with daily mean amplitude reaching at 0.21 ºC. Despite this, the high resilience of the system does not allow cumulative effects.