What's the weather like in South Korea in September?

In early September, I went to South Korea, Busan, Jeju Island and Seoul.

The weather in Jeju Island is very good. Because of the maritime climate, it rains almost every afternoon, so the air is good. Wear long sleeves in the morning and evening in September and short sleeves at noon.

Busan and Seoul are colder. It is recommended to wear thin long sleeves and thin coats. Generally, it will snow in June+February in 5438, and it will be very cold. A scarf with a thick sweater coat is also necessary. Jeju Island in June+February, 5438 will be a little more comfortable.