With a surface of approximately 800 km2, the metropolitan territory of Iaşi city is extremely differentiated in terms of the way in which the physical-geographic base is occupied, with important implications for the spatial differentiations of the climatic elements. For the identification of the thermic differentiations at the level of urban area of the city of Iaşi a series of thermo-hydrometric sensors was utilized (DT171) for determining temperature and air humidity, placed in different spots of the city, through which we tried to identify the influence that this exerts over the thermic regimen in different synoptic conditions. In this respect we chose as case study the heat wave produced in the period July 10-20th 2011 that highlights some differentiations in the manner of heat propagation at the level of the entire urban area.