Field Notes / Preparation

When to Visit South Korea: Weather, Seasons, and Festivals

2026-06 4 min read EN

At a glance — For a first trip, aim for late March to early May (cherry blossoms, mild temperatures) or mid-October to mid-November (autumn foliage). Avoid the monsoon from late June to mid-July, the humid heat of August, and the typhoon season of August-September on the southern coasts and Jeju.

The four seasons, from south to north

South Korea has a pronounced temperate continental climate: cold, dry winters; hot, humid summers; and two short but pleasant shoulder seasons. The difference between Seoul, Busan, and Jeju is noticeable — expect about a ten-day lag for the cherry blossoms to bloom or for the shift into autumn.

  • Spring (March-May): temperatures climb steadily from 50 to 72 F (10 to 22 C), with often clear skies. A very popular time to visit.
  • Summer (June-August): 77 to 91 F (25 to 33 C) in Seoul, high humidity, and frequent storms. The weather is tough in July and August.
  • Autumn (September-November): 59 to 77 F (15 to 25 C) early in the season, with dry air and crisp light. The most stable season.
  • Winter (December-February): 23 to 41 F (-5 to 5 C) in Seoul, often blue skies, and the chance of snow. Busan and Jeju stay mild (41 to 50 F / 5 to 10 C).

Cherry blossoms, jangma, foliage: the windows to know

Cherry blossoms 2026. The bloom sweeps from south to north over three to four weeks. According to forecasts published by the Korea Tourism Organization, the first buds are expected around March 22 in Jeju and March 23 in Busan (full bloom around March 30), then April 3-4 in Seoul (peak around April 10). Northern regions and higher elevations such as Chuncheon and Seoraksan follow in mid-April.

Rainy season (jangma). The Korean monsoon usually sets in from late June and lasts into mid or late July. For 2026, weather services forecast a start around June 20 and an end around July 25. It doesn't rain non-stop: expect heavy downpours alternating with humid lulls. Pack a poncho and quick-drying shoes, and keep your schedule flexible. Localized flooding and typhoon alerts can disrupt travel, especially around Busan and Jeju.

Typhoons (August-September). On average, seven typhoons a year approach the peninsula, peaking in August-September. Jeju, the southwest (Jeollanam-do), and the east coast are the most exposed. Check Korea Meteorological Administration alerts before you travel, and keep your train or ferry tickets refundable.

Autumn foliage (danpung). The colors spread from north to south beginning in late September. Seoraksan typically peaks between October 20 and 28, Bukhansan (Seoul) around mid-November, and Naejangsan in early to mid-November, with Busan and Jeju following through late November. Illumination festivals extend the season into the evening.

Festival calendar to build into your itinerary

  • Late March-early April — Jinhae Gunhangje, the country's largest cherry blossom festival (2026 edition runs March 27 to April 5 in Changwon).
  • Late April-early May — Jeonju International Film Festival (April 29-May 8, 2026), strong independent programming in a heritage setting.
  • Early May — Boseong Green Tea Festival (May 1-5, 2026), tea plantations in Jeollanam-do with workshops and tastings.
  • July — Boryeong Mud Festival, on the west coast, a lively affair right in the middle of jangma.
  • Late September-early October — Andong Mask Dance Festival, traditional masked dance in a historic village.
  • Early October — Busan International Film Festival (October 1-10, 2026), one of Asia's major cinema events; Chuseok (the harvest holiday) falls around October 5-7, so watch for closed museums and fully booked trains.

Which window for a first trip?

  • April: best compromise of cherry blossoms and mild weather, but book hotels and trains early.
  • Mid-May to mid-June: lush greenery, little rain, moderate crowds — one of the most comfortable windows.
  • Mid-September to mid-November: clear skies, mild temperatures, spectacular foliage. Ideal for hiking and temples.
  • December-February: low prices, snowy landscapes in the north, winter markets, and ski resorts (Pyeongchang, Gangwon). Pack genuinely warm clothing.
  • Top times to avoid: the second half of July and early August (intense heat, jangma followed by a heat wave), and the Chuseok and Lunar New Year (Seollal) weekends if you want to get around easily.

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