In this study, we conducted outdoor observation around the valley of Jinnouj i in Yawata City, Kyoto Prefecture. The purpose of this research was to clarify the occurrence of low temperature mountain breeze and its characteristics. Observations were carried out for 13 days out of sunny days from August to September 2015. As a result, it was revealed that mountain bree ze was confirmed in all observations for 13 days, and it was revealed that mountain breeze continues to occur day and night. It was a peculiar case that a remarkable mountain breeze occurs during the day. The mountain breeze brought about a remarkable temperature decrease of around 7.0 ℃ around the valley of Jinnouji during the summer day and it was confirmed that a continuous wind of 1.5 m wind speed was blowing. Chilling effect of this wind was high compared with general mountain breeze and valley breeze phenomenon. It turned out that this is a phenomenon that can be effectively ut ilized as a cool spot in urban areas.