The air temperatures have been measured in Sakai, Osaka, Higashi-Osaka and Hirakata located in Osaka plain in summer and winter seasons. The influence of the land use to the air temperature is clarified by measuring at the fixed points covered with the different land use, and the influence of the sea and land breeze is also discussed. Moreover, the comparison of these cities with different location and scale is performed. The air temperature distribution maps in Sakai and Hirakata are made based on the fixed point measurement data, and the current state of the thermal environment is clarified. The air temperature is high in Osaka and Higashi-Osaka regardless of day and night. The air temperature difference is actualized generally in winter compared with summer. The spatial difference in air temperature showed the tendency to become small generally excluding the coast part in summer when the sea breeze developed. There were strong correlations in air temperature and land use, and was a plain rise effect of air temperature on commerce and business use.

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