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Golden rice fields before the harvest in September

Korea in September 2027: Chuseok, Weather and Typhoons

Photo: Shamus7792003, CC BY-SA 4.0 · Wanju county (autumn rice field ready for harvesting near Gui Lake)..JPG

Checked against official sources on October 20, 2026

Summary

September cools from summer into autumn, with some typhoon risk. Seoul averages 21.6°C, with an average high of 26.2°C, an average low of 17.7°C and 141.5 mm of precipitation (KMA normals 1991–2020). Chuseok 2027 runs from Tuesday 14 to Thursday 16 September, and KASI lists no substitute holiday. In 2026 it fell on 24–26 September. Official 2027 festival dates are not yet published.

At a glance

Seoul average
21.6°C
Average high
26.2°C
Average low
17.7°C
Precipitation
141.5 mm
Chuseok 2027
Tuesday 14 to Thursday 16 September
Typhoons, normal September
0.8 affecting Korea

Details

September is when the heat breaks. Early in the month it still feels like summer, and by the end the evenings are cool. It also holds Chuseok, Korea's harvest holiday, which changes how trains, shops and sights work for a few days. This guide is written on 20 October 2026 for September 2027. Where organizers had not announced 2027 dates, it says so and shows the 2026 pattern.

Weather in September

City Average high (°C) Average low (°C) Precipitation (mm)
Seoul 26.2 17.7 141.5
Busan 26.4 19.8 160.6
Jeju City 26.1 20.9 227.8

Source: KMA climate normals 1991–2020, stations 108, 159 and 184 (KMA). Seoul's September average is 21.6°C, and its average relative humidity is 66.4%, lower than the 73.5% in August.

These are 30-year averages, not a forecast. Seoul gets about 41% of its August rain and Busan about 60%. Jeju gets the most of the three cities, at 227.8 mm. Check the KMA forecast in the week before you fly.

Typhoons in September

The typhoon season, 태풍taepungTyphoon, runs from June to October (VisitKorea). KMA's 1991–2020 normal for September is 5.1 typhoons forming in the North Pacific and 0.8 affecting Korea, against 1.2 in August (KMA). Flights and ferries to islands can be cancelled, and outdoor events postponed. Check the KMA forecast daily, and read the safety guide.

What to wear

  • Light clothes for early September. Seoul's average high is 26.2°C.
  • A thin layer for evenings. The average low falls to 17.7°C.
  • A compact umbrella. Showers and typhoon rain are possible.
  • A light jacket for the end of the month. Evenings keep getting cooler.

Chuseok 2027

추석ChuseokHarvest festival is the harvest holiday, on the 15th day of the eighth lunar month (VisitKorea). In 2027, KASI lists it from Tuesday 14 to Thursday 16 September and shows no substitute holiday, so Wednesday 15 September is the middle day (KASI). In 2026 it was 24–26 September, ten days later.

Many businesses close for part of the holiday. The 2026 pattern, from the Korea Tourism Organization's Chuseok guide, was (VisitKorea):

  • Free entry. Seoul's four main palaces, Jongmyo Shrine and the royal tombs, and about 40 national recreational forests.
  • Closed on Chuseok Day. National museums and branches of the National Museum of Modern and Contemporary Art, most regional national museums, and many department stores, shopping malls and restaurants.
  • Open. Convenience stores and shops near tourist attractions often stay open. Subways and city buses run as usual.
  • Trains and express buses. Tickets sell out quickly, so book as soon as booking opens. See KTX and trains.

The arrangements for 2027 are not announced. Check each venue's site before you go.

Events and festivals

No organizer had published 2027 dates when this page was written. These are the 2026 dates, to show the usual timing.

2026 event Place 2026 dates Organizer
Andong Maskdance Festival, 안동국제탈춤페스티벌Andong Gukje Talchum PeseutibeolAndong International Maskdance Festival Andong, North Gyeongsang 24 September to 4 October Korea Foundation for Cultures and Ethics

Source: VisitKorea. The festival's official site is maskdance.com; admission is free but some programs charge a fee. The 2027 dates are not announced. For other events, see the Korea Tourism Organization's festival listings.

Crowds and prices

The Korea Tourism Organization names July to August and December to January as peak seasons (VisitKorea). September is not on that list, so it is outside the peak season, except around Chuseok, when trains and express buses fill. For the leaf season that follows, see Korea in October and the autumn foliage guide.

Where to go

  • Seoul: palaces and Han River walks as the heat fades. See the Seoul guide.
  • Busan: beaches stay warm, with highs of 26.4°C. See the Busan guide.
  • Jeju: warm, but the wettest of the three cities this month at 227.8 mm. See the Jeju guide.

Close-up of golden ripening rice ears in a paddy field

Questions and answers

When is Chuseok in 2027?

Tuesday 14 to Thursday 16 September 2027, with Wednesday 15 September as the middle day. KASI lists no substitute holiday.

Is September a good time to visit Korea?

Yes, mostly. The heat eases and humidity drops. Watch for typhoons and avoid the Chuseok days if you want shops, museums and trains to run normally.

Does it still rain in September?

Yes. Seoul averages 141.5 mm, about 40% of its August total.

Previous: Korea in August. Next: Korea in October.

Official sources (10)

Last checked October 20, 2026Next check due November 19, 2026

Rules can change. Confirm on the official site before you travel.

Next stepKorea in October 2026: Autumn Foliage, Holidays and Weather

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