Jeju City Weather in September

September weather

September still feels warm and sticky in Jeju City, with humid air and frequent cloud. The high is 25°C, and rain falls on 12 days, so showers can interrupt a day out. It's cooler and less rainy than August, but October is drier and more comfortable.

You can explore Dongmun Market, visit the old town, or take a coastal walk between showers. For clear views from Yongduam Rock, keep your plans flexible; cloud can soften the scenery. Long hikes may feel tiring in the humidity, and exposed beaches can be uncomfortable when rain or wind rolls in.

Events and holiday crowds

Chuseok, Korea's harvest holiday, sometimes falls in September and sometimes in October. When it does, many local families travel, and transport and popular sights can get busier. The holiday dates change each year, so don't assume every September has a Chuseok rush.

Outside the holiday, September is usually calmer than August, when summer school breaks bring more visitors. Prices often ease after that summer peak, though demand can rise around Chuseok. October is a popular choice for its better weather, so September can suit you if you'd rather avoid the busiest autumn period.

A useful local tip

Families with young children may prefer a short stop at Dongmun Market to a long, exposed beach afternoon.

Use the market as your rainy-day anchor: sample gogi-guksu, Jeju's pork noodle soup, and browse the covered stalls while showers pass. If you're heading to Seongsan Ilchulbong, check the sky before leaving Jeju City; low cloud can hide the crater views. September brings only about four hours of sun a day, so keep an indoor option in mind.