Abstract
The purpose of this study is to clarify relations between sea-surface temperature and air temperature of an urbanized bay area in summer seasons by observational data analysis and numerical simulation. The observational data analysis using the AMeDAS and the Meteorological Objective Data showed that the sea-surface temperature has great influences on the air temperature of the bay area and sea breeze in night time contributes to raise the air temperature. The numerical simulation with the HOTMAC represents that a control of sea-surface temperature may be an effective method of lowering the air temperature of the bay area in summer night time
