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Voykit

When to go · South Korea

South Korea in September

Mixed month. Heat eases; typhoon risk remains and Chuseok shuts the country for 3 days in many years.

Key facts

Verdict
Mixed
Crowds
Medium
South Korea
Prices
Medium
South Korea

Verdict

MixedVoykit month rating for South Korea

Heat eases; typhoon risk remains and Chuseok shuts the country for 3 days in many years.

Is another month better than September?

September is rated mixed. These months rate higher:

Weather in September

  • Seoul and north-west · Seoul, Incheon, Suwon, the DMZfine

    Continental: dry winters down to −15 °C (5 °F) on cold snaps, hot humid summers. Fine dust (yellow dust and pollution) peaks Mar–Apr; the monsoon runs late Jun – Jul.

  • Busan and south-east coast · Busan, Gyeongju, Tongyeong, Ulsanstorm or typhoon risk

    Milder winters than Seoul, rarely below freezing; typhoons most likely Aug–Sep and ferries to Japan stop when they pass.

  • Jeju · Jeju City, Seogwipo, Hallasanstorm or typhoon risk

    Windy and wet; the island takes the first hit of most typhoons. Hallasan summit gets snow in winter; flights stop in strong crosswinds.

  • Gangwon mountains and east coast · Sokcho, Seoraksan, Gangneung, Pyeongchangbest weather

    Coldest region: ski season Dec–Feb, peak autumn colour mid-October in Seoraksan; summer beaches crowded in late Jul – Aug.

  • Gangwon: East coast (Sokcho, Gangneung, Yangyang) · East Sea shorelinebest weather

    Milder than the interior; sea fog and rain in July–August, typhoon tail-ends in late summer.

  • Coldest in Korea in winter; ski resorts usually run late November to March. Autumn colour peaks in October.

  • Gyeonggi: Gyeonggi lowlands (Suwon, Incheon, Gimpo) · west and south of Seoulbest weather

    Monsoon rain late June to July; August is hot and humid; January nights drop well below freezing.

  • Gyeonggi: Eastern hills (Gapyeong, Yangpyeong, Pocheon) · Gyeongchun and Jungang line corridorsbest weather

    A few degrees cooler than the lowlands; autumn colour peaks in late October and early November.

  • Jeju: Jeju City / north coast · island northrainy

    Milder than the mainland; heaviest rain June–September, typhoons Aug–Sep.

  • Jeju: Seogwipo / south coast · island southrainy

    Wetter and slightly warmer than the north; Hallasan summit is much colder and often in cloud.

  • North Chungcheong: Inland basin (Cheongju, Chungju, Jecheon) · Province-wide, landlockedbest weather

    Continent-style swings: July–August humid and 30 °C (86 °F)+, January often below -5 °C (23 °F). Rainy season (jangma) late June to mid-July; autumn leaves peak late October to early November.

  • North Gyeongsang: Inland basin (Gyeongju, Andong, Daegu) · Interior valleys ringed by the Sobaek and Taebaek rangesbest weather

    Daegu and the basins run several degrees hotter than the coast in July–August; monsoon rain lands late June to July, and typhoons can reach the east coast in August–September.

  • North Gyeongsang: East coast (Pohang) · Seaward side of the Taebaek rangebest weather

    Milder winters and cooler summers than the interior; sea fog and wind are the trade-off.

  • North Jeolla: Jeonju and the plains · Inland basin, west of the mountainsbest weather

    Hot, humid July–August; monsoon rain late June to July; cold, dry winters. Autumn is the clearest and busiest.

  • North Jeolla: Mountains (Muju, Deogyusan) · East of the provincebest weather

    Cooler than the plains; snow and skiing December to early March; foliage peaks in October.

  • Rainy season (jangma) late June to mid-July; August is humid and 30 °C (86 °F)+; January nights drop well below freezing.

  • Coastal fog and wind in spring; tidal flats are best at low tide — check the tide table before you go.

  • Rainy season (jangma) late June to mid-July; typhoons can hit Aug-Sep and stop ferries for a day.

  • South Gyeongsang: Inland (Jinju, Miryang, Hapcheon) · Nakdong basin and mountainsfine

    Hotter and colder than the coast; Haeinsa sits high and is cooler in summer.

  • Warmest province on the peninsula; July–August average highs near 30 °C (86 °F) with 290–330 mm of rain each month. Spring and October are the dry, comfortable windows.

  • South Jeolla: Yeosu and the south coast · Yellow Sea and Jeju Straitfine

    Sea moderates the heat; fog and wind can delay ferries in spring and autumn.

  • Seoul26 °C (79 °F) / 18 °C (64 °F), 9 rain days
  • Andong26 °C (79 °F) / 16 °C (61 °F), 9 rain days
  • Ansan27 °C (81 °F) / 16 °C (61 °F), 8 rain days
  • Anseong27 °C (81 °F) / 17 °C (63 °F), 8 rain days
  • Anyang25.9 °C (79 °F) / 18.2 °C (65 °F), 9 rain days
  • Asan27 °C (81 °F) / 17 °C (63 °F), 8 rain days
  • Baengnyeong Island23.5 °C (74 °F) / 17.8 °C (64 °F), 91 rain days
  • Boryeong26 °C (79 °F) / 17 °C (63 °F), 8 rain days
  • Buan17 °C (63 °F) / 27 °C (81 °F), 139 rain days
  • Bucheon27 °C (81 °F) / 18 °C (64 °F), 7 rain days
  • Bundang27 °C (81 °F) / 17 °C (63 °F), 9 rain days
  • Buyeo27 °C (81 °F) / 16 °C (61 °F), 9 rain days
  • Changwon27 °C (81 °F) / 19 °C (66 °F), 9 rain days
  • Cheonan26.1 °C (79 °F) / 15.2 °C (59 °F), 8 rain days
  • Cheongju26 °C (79 °F) / 17 °C (63 °F), 9 rain days
  • Cheorwon26 °C (79 °F) / 15 °C (59 °F), 8 rain days
  • Chujado25 °C (77 °F) / 19 °C (66 °F), 11 rain days
  • Chuncheon26 °C (79 °F) / 15 °C (59 °F), 9 rain days
  • Daebudo26 °C (79 °F) / 18 °C (64 °F), 8 rain days
  • Daegu27 °C (81 °F) / 18 °C (64 °F), 9 rain days
  • Daejeon26 °C (79 °F) / 17 °C (63 °F), 9 rain days
  • Damyang27 °C (81 °F) / 17 °C (63 °F), 9 rain days
  • Dangjin25 °C (77 °F) / 18 °C (64 °F), 8 rain days
  • Danyang27 °C (81 °F) / 15 °C (59 °F), 10 rain days
  • Deokjeok Island25 °C (77 °F) / 17 °C (63 °F), 8 rain days
  • Deokso23 °C (73 °F) / 15 °C (59 °F), 7 rain days
  • Dongducheon26 °C (79 °F) / 15 °C (59 °F), 8 rain days
  • Donghae25 °C (77 °F) / 16 °C (61 °F), 9 rain days
  • Ganghwa Island26 °C (79 °F) / 18 °C (64 °F), 9 rain days
  • Gangneung25 °C (77 °F) / 16 °C (61 °F), 10 rain days
  • Gapado25 °C (77 °F) / 19 °C (66 °F), 10 rain days
  • Gapyeong26 °C (79 °F) / 15 °C (59 °F), 9 rain days
  • Geoje26.5 °C (80 °F) / 18.2 °C (65 °F), 10 rain days
  • Geomundo26 °C (79 °F) / 19 °C (66 °F), 9 rain days
  • Gimcheon26 °C (79 °F) / 18 °C (64 °F), 9 rain days
  • Gimhae28 °C (82 °F) / 19 °C (66 °F), 12 rain days
  • Gimje24 °C (75 °F) / 15 °C (59 °F), 9 rain days
  • Gimpo26 °C (79 °F) / 17 °C (63 °F), 9 rain days
  • Goheung27 °C (81 °F) / 17 °C (63 °F), 11 rain days
  • Gongju27 °C (81 °F) / 16 °C (61 °F), 8 rain days
  • Goryeong27 °C (81 °F) / 17 °C (63 °F), 9 rain days
  • Goseong25 °C (77 °F) / 15 °C (59 °F), 9 rain days
  • Goyang27 °C (81 °F) / 16 °C (61 °F), 8 rain days
  • Guinsa24 °C (75 °F) / 15 °C (59 °F), 7 rain days
  • Gumi26 °C (79 °F) / 16 °C (61 °F), 9 rain days
  • Gunpo26 °C (79 °F) / 18 °C (64 °F), 8 rain days
  • Gunsan26 °C (79 °F) / 18 °C (64 °F), 9 rain days
  • Gunwi County27 °C (81 °F) / 16 °C (61 °F), 4 rain days
  • Gwacheon26 °C (79 °F) / 18 °C (64 °F), 9 rain days
  • Gwanggyo26 °C (79 °F) / 16 °C (61 °F), 9 rain days
  • Gwangju, Gyeonggi26 °C (79 °F) / 16 °C (61 °F), 8 rain days
  • Gwangju27 °C (81 °F) / 18 °C (64 °F), 9 rain days
  • Gwangmyeong27 °C (81 °F) / 19 °C (66 °F), 8 rain days
  • Gwangyang27 °C (81 °F) / 18 °C (64 °F), 7 rain days
  • Gyeongju26 °C (79 °F) / 16 °C (61 °F), 10 rain days
  • Gyeongsan24 °C (75 °F) / 15 °C (59 °F), 9 rain days
  • Haenam27 °C (81 °F) / 17 °C (63 °F), 10 rain days
  • Hampyeong26 °C (79 °F) / 17 °C (63 °F), 9 rain days
  • Hapcheon27 °C (81 °F) / 16 °C (61 °F), 9 rain days
  • Hongdo23 °C (73 °F) / 16 °C (61 °F), 8 rain days
  • Hongseong26 °C (79 °F) / 15 °C (59 °F), 9 rain days
  • Hwaseong26 °C (79 °F) / 17 °C (63 °F), 8 rain days
  • Icheon26 °C (79 °F) / 15 °C (59 °F), 12 rain days
  • Iksan26 °C (79 °F) / 17 °C (63 °F), 0 rain days
  • Inje25 °C (77 °F) / 14.5 °C (58 °F), 9 rain days
  • Jangheung26.9 °C (80 °F) / 16.5 °C (62 °F), 9 rain days
  • Jebudo26 °C (79 °F) / 18 °C (64 °F), 8 rain days
  • Jecheon25 °C (77 °F) / 13 °C (55 °F), 8 rain days
  • Jeongdongjin23 °C (73 °F) / 14 °C (57 °F), 4 rain days
  • Jeongeup27 °C (81 °F) / 17 °C (63 °F), 10 rain days
  • Jeongseon22 °C (72 °F) / 12 °C (54 °F), 9 rain days
  • Jeonju27 °C (81 °F) / 17 °C (63 °F), 8 rain days
  • Jindo26 °C (79 °F) / 17 °C (63 °F), 9 rain days
  • Jinju27 °C (81 °F) / 17 °C (63 °F), 9 rain days
  • Jumunjin26 °C (79 °F) / 16 °C (61 °F), 10 rain days
  • Miryang26 °C (79 °F) / 17 °C (63 °F), 9 rain days
  • Mokpo27 °C (81 °F) / 19 °C (66 °F), 9 rain days
  • Muan26.7 °C (80 °F) / 17.6 °C (64 °F), 9 rain days
  • Muju25 °C (77 °F) / 16 °C (61 °F), 9 rain days
  • Mungyeong25.3 °C (78 °F) / 14.5 °C (58 °F), 8 rain days
  • Naju17 °C (63 °F) / 27 °C (81 °F), 56 rain days
  • Namhae27 °C (81 °F) / 20 °C (68 °F), 6 rain days
  • Namwon15.6 °C (60 °F) / 27 °C (81 °F), 144 rain days
  • Namyangju26 °C (79 °F) / 15 °C (59 °F), 8 rain days
  • Nonsan26 °C (79 °F) / 17 °C (63 °F), 8 rain days
  • Paju26 °C (79 °F) / 15 °C (59 °F), 8 rain days
  • Pangyo26 °C (79 °F) / 16 °C (61 °F), 8 rain days
  • Pocheon26 °C (79 °F) / 15 °C (59 °F), 8 rain days
  • Pohang26 °C (79 °F) / 19 °C (66 °F), 9 rain days
  • Pyeongchang22 °C (72 °F) / 12 °C (54 °F), 9 rain days
  • Pyeongtaek27 °C (81 °F) / 17 °C (63 °F), 8 rain days
  • Sacheon24 °C (75 °F) / 18 °C (64 °F), 9 rain days
  • Samcheok22 °C (72 °F) / 14 °C (57 °F), 7 rain days
  • Sangju26 °C (79 °F) / 16 °C (61 °F), 8 rain days
  • Sejong City26 °C (79 °F) / 15 °C (59 °F), 9 rain days
  • Seogwipo26 °C (79 °F) / 20 °C (68 °F), 10 rain days
  • Seongju County26 °C (79 °F) / 16 °C (61 °F), 9 rain days
  • Seongnam26 °C (79 °F) / 17 °C (63 °F), 9 rain days
  • Seosan26.1 °C (79 °F) / 16.1 °C (61 °F), 9 rain days
  • Siheung27 °C (81 °F) / 18 °C (64 °F), 8 rain days
  • Sokcho25 °C (77 °F) / 16 °C (61 °F), 9 rain days
  • Somaemuldo26 °C (79 °F) / 19 °C (66 °F), 9 rain days
  • Songdo26 °C (79 °F) / 18 °C (64 °F), 8 rain days
  • Suanbo26 °C (79 °F) / 16 °C (61 °F), 8 rain days
  • Suwon26 °C (79 °F) / 17 °C (63 °F), 9 rain days
  • Taebaek22 °C (72 °F) / 12 °C (54 °F), 10 rain days
  • Tongyeong27 °C (81 °F) / 19 °C (66 °F), 9 rain days
  • Udo Island25 °C (77 °F) / 17 °C (63 °F), 8 rain days
  • Uijeongbu-si26 °C (79 °F) / 16 °C (61 °F), 8 rain days
  • Uijeongbu26 °C (79 °F) / 16 °C (61 °F), 7 rain days
  • Uiryeong27 °C (81 °F) / 20 °C (68 °F), 8 rain days
  • Uiwang23 °C (73 °F) / 15 °C (59 °F), 8 rain days
  • Ulsan26 °C (79 °F) / 18 °C (64 °F), 9 rain days
  • Wonju26 °C (79 °F) / 16 °C (61 °F), 0 rain days
  • Yanggu24 °C (75 °F) / 14 °C (57 °F), 10 rain days
  • Yangju27 °C (81 °F) / 15 °C (59 °F), 8 rain days
  • Yangsan27 °C (81 °F) / 19 °C (66 °F), 10 rain days
  • Yangyang24 °C (75 °F) / 16 °C (61 °F), 11 rain days
  • Yecheon27 °C (81 °F) / 19 °C (66 °F), 7 rain days
  • Yeoju27 °C (81 °F) / 15 °C (59 °F), 154 rain days
  • Yeoncheon26 °C (79 °F) / 15 °C (59 °F), 7 rain days
  • Yeongcheon26 °C (79 °F) / 18 °C (64 °F), 8 rain days
  • Yeongjong Island25 °C (77 °F) / 17 °C (63 °F), 8 rain days
  • Yeongju24 °C (75 °F) / 13 °C (55 °F), 9 rain days
  • Yeongwol23 °C (73 °F) / 13 °C (55 °F), 8 rain days
  • Yeonpyeong Island26 °C (79 °F) / 18 °C (64 °F), 9 rain days
  • Yeosu26 °C (79 °F) / 21.5 °C (71 °F), 9 rain days
  • Yesan26 °C (79 °F) / 16 °C (61 °F), 10 rain days
  • Yokjido25 °C (77 °F) / 19 °C (66 °F), 9 rain days
  • Yongin26 °C (79 °F) / 15 °C (59 °F), 8 rain days
  • Yuseong-gu27 °C (81 °F) / 17 °C (63 °F), 9 rain days
  • Busan27 °C (81 °F) / 19 °C (66 °F), 11 rain days
  • Jeju City26 °C (79 °F) / 20 °C (68 °F), 11 rain days
  • Incheon26 °C (79 °F) / 18 °C (64 °F), 8 rain days

Festivals and holidays

Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.

  • Chuseok (harvest festival) big impact

    Chuseok: 24–26 Sep 2026 (passed); about 14–16 Sep 2027 (check)

    Same three-day shutdown as Seollal; the largest travel peak of the year.

Crowds and prices

Crowds · South Korea
Medium
Prices · South Korea
Medium

Compare two months

Weather, crowds and prices for any two months in South Korea, side by side.

  • Verdict

    Sep: Mixed

    Apr: Great (better)

  • Crowds

    Sep: Medium

    Apr: High

  • Prices

    Sep: Medium

    Apr: High

  • Festivals listed

    Sep: 1

    Apr: 4

September: Heat eases; typhoon risk remains and Chuseok shuts the country for 3 days in many years.

April: Cherry blossom in Seoul and Gyeongju early in the month; dust days still happen.

South Korea: figures are long-term averages from this guide, not a forecast.

What to pack

  • A rain jacket or umbrella and shoes that dry fast
  • A spare day in the plan: storms can cancel flights and ferries

Build the full packing list for your trip →

Where to go in September

Rated best or good this month

  • Gangwon mountains and east coast

    Best weather of the year (Sokcho, Seoraksan, Gangneung, Pyeongchang)

  • Andong

    Best months: Sep–Oct; also Apr–May

  • Ansan

    Best months: Apr–Jun, Sep–Oct

  • Anseong

    Best months: Apr–May, Sep–Oct

  • Asan

    Best months: Apr–May, Sep–Nov

  • Baengnyeong Island

    Best months: May–Jun, Sep–Oct

  • Boryeong

    Best months: May–Jun, Sep–Oct; July for the Mud Festival

  • Buan

    Best months: Apr–Oct

  • Bucheon

    Best months: Apr–Oct

  • Bundang

    Best months: Apr–Jun, Sep–Nov

  • Buyeo

    Best months: Apr–May, Sep–Oct

  • Cheonan

    Best months: Apr–Jun, Sep–Nov

Better another month

  • Busan and south-east coast

    Milder winters than Seoul, rarely below freezing; typhoons most likely Aug–Sep and ferries to Japan stop when they pass.

  • Jeju

    Windy and wet; the island takes the first hit of most typhoons. Hallasan summit gets snow in winter; flights stop in strong crosswinds.