Thermal environment inside an enclosed arcade located in the area with mild and sunny climat was investigated on field observations both in summer 1995 and in winter 1996, and evaluated by calculating MRT, SET and subjective response of human. Physically and psychologically, solar radiation influenced thermal environment inside the arcade. Third fourth of the value of equivalent temperature of radiation was caused directly and indirectly by solar radiation. In daytime of summer, SET^* inside the arcade was lower than outside, however in nighttime the situation was reversed. In daytime of winter, SET^* outside the arcade was higher than inside.
