In this report, effect of the anthropogenic waste heat upon urban thermal environment was described. (1) During night, the amount of anthropogenic waste heat is less than that during daytime, though the increase in temperature is about three times larger that during daytime. (2) Zones subject to temperature rise due to anthropogenic waste heat are clearly different in location between day and night. (3) Waste heat causes the delay of changing to land breeze especially in coastal zones. (4) Night waste heat significantly raises the air temperature, and its effect continues during the morning hours. (5) Night waste heat has a stronger effect in wider areas.
