In order to understand the tendency of temperature change in Jeju Island, the short-term forecasting model of Halla, the weather data of the Korean peninsula, and the wind vector of AWS is analyzed. When the south winds flow into the sea, sea winds form around Hallasan, and the sea breeze is formed on the downwind side of the sea. On the coast, winds and the sea breezes gather around the coasts to form a persistent eddy, and the highest temperature occurs in the region where the eddy occurs.