This paper reports the measurement results of the thermal environment on platforms in station 'T' that is one of the largest railway stations in Japan during clear-sky summer days. It was found that there were distributions of air temperature for both east-west and north-south directions on each platform, and the air temperature on platform VII was the highest during all through the measurement days. Mean radiant temperature (MRT) on each platform was calculated with the result of measurement of surface temperature distribution. Comparing diurnal change of MRT to that of air temperature on each platform it was clarified that the difference of maximum and minimum value of air temperature even at the nighttime almost matched the difference of maximum and minimum value of MRT in the daytime. It was suggested that the remedy from the point of not only prevention of heat penetration through stations' roofs but also the prevention of rise of air temperature was important.
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