Seoul in September — Travel Guide

By Harry Nara · Last updated September 24, 2026

#Weather in Seoul in September

Seoul in September averages 18–26°C (64–79°F) with around 7 days of rain, and crowds are medium.

September is the month summer lets go. The first week can still be hot and humid, and early September carries most of the month's rain, including the risk of a late typhoon. By the second half, the humidity drops, the skies clear, and the city settles into highs in the low to mid-20s. The evenings become comfortable for the first time since June.

Typhoons are the wild card. Most pass elsewhere or weaken before reaching Seoul, but when one does, the result is a day or two of wind and heavy rain.

#What to Do in Seoul in September

The harvest moon

Chuseok falls on the full moon of the eighth lunar month, the brightest of the year in Korean tradition, and on the night itself people make a wish on it. Namsan and the riverbanks are the places to watch it rise over the city. In the days around it, the palaces and folk museums run traditional events, and in 2026 the four palaces and Jongmyo Shrine opened free for the holiday.

Seoul's art week

Early September is when Seoul's big art fairs take place, and galleries across the city open new shows to coincide. Frieze Seoul, which has run alongside Kiaf Seoul at COEX since 2022, is moving to the Dongdaemun Design Plaza for its 2027 edition. Check the dates for the year, which are published by the fairs.

The first clear days

The second half of September brings the first properly clear, dry days since spring. Use them for the things summer made uncomfortable: a walk on the city wall, a climb up Inwangsan, a bike ride along the Han.

Palace nights

The palaces usually run evening openings in autumn, sold online in advance, and September's mild evenings are ideal for them. The lit pavilions of Gyeongbokgung reflected in their ponds are the most popular.

#Getting Around

September is when walking across Seoul becomes pleasant again. Seoullo 7017, the garden walkway built on an old highway overpass beside Seoul Station, is a good place to start once the heat breaks, and it links on foot to Namdaemun Market and the lanes of Jungnim-dong.

Chuseok changes the rules for three days. Any train or express bus out of the city over the holiday needs booking the moment tickets go on sale, and roads out are jammed on the first day; inside Seoul, those same days are the easiest of the autumn to get around.

#Budget & Costs

September prices depend on Chuseok. The holiday week is expensive for transport out of the city and for flights to and from Korea, but hotels in Seoul itself can be reasonable while residents are away. The rest of the month is moderately priced, rising towards October.

The palaces over Chuseok, the riverbanks and the city wall cost little or nothing; the money goes on getting in and out of the country around the holiday.

#Food & Dining

Chuseok food is songpyeon, half-moon rice cakes filled with sesame, beans or chestnut, and steamed on pine needles. Bakeries and rice cake shops sell them in the week before the holiday. Jeon, pan-fried slices of fish and vegetables in batter, is the other Chuseok dish.

September is also the start of the harvest season: new-crop rice, pears and the first chestnuts appear in the markets. Gwangjang Market's stalls are at their most comfortable once the humidity lifts.

#Nightlife

As the evenings cool, Seoul's nightlife moves back outside. The pavement bars in Euljiro, the riverbanks, and the rooftops of Itaewon and Seongsu are all at their best in the second half of September.

Over Chuseok, nightlife is quiet in residential areas but continues in the centre.

#Shopping

In early September the department store food halls stack up with Chuseok gift boxes of pears, beef, ginseng and dried fish, wrapped with great care. Worth a look even if you buy nothing.

Autumn collections arrive in the shops. Insadong's traditional shops are good for gifts.

#Culture & Etiquette

Chuseok is a family time. If you are invited into a Korean home over the holiday, bring a small gift, take your shoes off at the door, and accept food and drink with two hands.

At the palaces and folk villages over the holiday, you may see families in hanbok performing bows or games. Ask before photographing people.

#Essential Local Phrases

#Packing List

• Light clothes for the early month, and a layer for cooler evenings later
• A compact umbrella for early-month rain
• Comfortable walking shoes
• Light hiking shoes if you plan to climb
• Sunscreen and sunglasses
• A small gift if you might visit a Korean home at Chuseok
• A refillable water bottle
• A power bank

#Safety & Health

Early September can still be hot, so the summer precautions apply until the humidity breaks. If a typhoon approaches, follow the emergency alerts and stay indoors while it passes.

#Backup Plans

A rainy or stormy September day is a museum day. The National Museum of Korea, the National Museum of Contemporary Art and the galleries of Samcheong-dong, near Gyeongbokgung, all work well, especially during art week.