Jeju Island will go to Jeju Island in late June. What was the temperature then? What clothes is suitable for Yang? thank you

The average annual temperature in Jeju Island is about 16 degrees Celsius, and the average annual precipitation is more than 1000 mm.. Although it is located at about 33 degrees north latitude, it actually has a temperate maritime climate of about 27 degrees in late June, but the weather in Jeju is changeable. I suggest you take a long-sleeved sportswear to avoid unpleasant travel caused by rain and cold.