Jeju Island 18 to 22 degrees, is it cold to wear short sleeves?

It will get cold. According to Baidu map, Jeju Island in South Korea is located at the southern tip of the Korean Peninsula, with a subtropical monsoon climate. 18 to 22 degrees is suitable for wearing trench coats, coats and jeans, so wearing short sleeves feels cool. The weather in Jeju Island changes greatly, so it is necessary to keep warm and protect from the sun. Tourists should take umbrellas when going out to avoid direct sunlight.