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South Korea has four seasons that actually behave like seasons, which makes the answer simpler than it is in Southeast Asia. Spring and autumn are excellent. Winter is properly cold: Seoul’s average high in January is 2.1 °C. And summer has a monsoon, jangma, that delivers more than half of Seoul’s annual rain in July and August alone.
So the best time to visit South Korea is mid-April to May, or late September to early November. The interesting part is at the edges: when the blossom really peaks, how bad the spring dust gets, and which weeks the entire country is on the road. Below, every month in Seoul with the numbers, then season by season.
The short answer
- Best overall: late September to early November, then mid-April to May.
- Cherry blossom: late March in Busan and Jinhae, early April in Seoul.
- Autumn colour: mid-October in Seoraksan, late October to early November in Seoul.
- Avoid: jangma (late June to late July), and intercity travel over Chuseok (14–16 September 2027) or Seollal (around 7 February 2027).
- Cheapest: January and February outside Seollal. Cold, dry and clear.
South Korea weather by month, in one table
Temperature and rainfall are the Korea Meteorological Administration’s 1991–2020 normals for Seoul. Busan and Jeju are a few degrees milder in winter and get their rain a little earlier. Crowding is our own five-point rating, based on arrival figures and the domestic holiday calendar. Highlighted rows are the months we would book first.
| Month | Avg high · Seoul | Rain | Crowds | The call |
|---|---|---|---|---|
| January | 2.1 °C | 17 mm | Coldest · cheapest · ski season | |
| February Seollal | 5.1 °C | 28 mm | Cold, dry · Seollal rush | |
| March | 11.0 °C | 37 mm | Blossom in the south · dust | |
| April blossom | 17.9 °C | 73 mm | Cherry blossom · mild days | |
| May | 23.6 °C | 104 mm | Warm, green · holiday weekends | |
| June | 27.6 °C | 130 mm | Humid · jangma from late June | |
| July jangma | 29.0 °C | 414 mm | Monsoon peak | |
| August | 30.0 °C | 348 mm | Hottest · holiday crowds · typhoons | |
| September Chuseok | 26.2 °C | 142 mm | Clearing · Chuseok week | |
| October | 20.2 °C | 52 mm | Clear, crisp · foliage starts | |
| November foliage | 11.9 °C | 51 mm | Seoul foliage · cold by the end | |
| December | 4.2 °C | 23 mm | Cold, dry · winter lights |
Look at July. The 414 mm that falls on Seoul that month is nearly twice what the city gets from November to April combined. Korea’s weather is not a gentle curve; it is six dry months, a sudden deluge, then a long clear autumn.
Spring: cherry blossom, and the dust
The blossom moves up the peninsula in about two weeks. Jeju and the south coast bloom first, in late March, and the Jinhae Gunhangje festival near Changwon, the biggest in the country, is usually timed for the last days of March and the first of April. Seoul follows in early April, along Yunjung-ro on Yeouido and around Seokchon Lake. A warm March pulls everything forward, as it has in most recent years, so book a range of dates rather than one weekend.
The catch is the air. Spring is yellow dust season (hwangsa): on a few days between March and May, wind carries fine sand from the deserts of Mongolia and northern China across the peninsula, on top of fine-particle pollution that is already at its worst in late winter and spring. On a bad day the sky turns beige and sightseeing outdoors is miserable. The government’s AirKorea site and app give real-time readings. Koreans wear KF94 masks on those days, and it is worth packing a few.
May is the best of spring: 23.6 °C, green hills, little dust by the end of the month. Just note the early-May holidays, Children’s Day on 5 May and Buddha’s Birthday (13 May in 2027), which often join a weekend and fill Jeju and the east coast.
Summer: jangma, heat and typhoons
Jangma, the East Asian summer monsoon, usually reaches Jeju in the second half of June and Seoul around the last week of June, then sits over the country until late July. It does not rain every hour, but when it rains it pours, and flash flooding in low-lying parts of Seoul makes the news most summers.
August is drier on paper and worse in practice: 30 °C highs, heavy humidity, and “tropical nights” when the temperature stays above 25 °C. Typhoons reach Jeju and the south coast mostly in August and September. Late July to early August is also when most Koreans take their summer holiday, so Haeundae in Busan and the east-coast beaches are at their fullest just as the weather is at its least pleasant.
From late September to early November, Korea is at its best. The air is dry, the skies are clear, and October’s rainfall in Seoul is about 52 mm, an eighth of July’s. If we had to pick one month, it would be October.
Autumn colour starts in the mountains. Seoraksan, in the northeast, usually peaks in mid-October; Naejangsan, in the southwest, in late October to early November; Seoul’s palaces, Namsan and Bukhansan in the last days of October and the first week of November. The Korea Forest Service publishes a foliage forecast every autumn. The one thing to plan around is Chuseok, the harvest festival, which fell on 25 September in 2026 and falls on 15 September in 2027.
Winter: cold, dry and cheap
Seoul’s winter is colder than its latitude suggests. The average January high is 2.1 °C, nights are well below freezing, and a dry wind from Siberia makes it feel colder still. It is also clear, dry and cheap. The ski resorts in Gangwon Province, including the PyeongChang Olympic venues, run from December to February, and Jeju stays several degrees milder. Pack properly and January is an underrated month to visit.
Chuseok, Seollal and the weeks to plan around
Korea has two holidays when the country travels home at the same time. Both follow the lunar calendar, so the dates move every year.
| Period | Dates | What actually happens |
|---|---|---|
| Seollal (lunar new year) | around 7 Feb 2027 | Three days off, plus a substitute day when one falls on a weekend. KTX tickets sell out as soon as they are released, and the highways out of Seoul jam. Many family restaurants and traditional markets close on the day itself. Seoul goes quiet. |
| Chuseok (harvest festival) | 14 – 16 Sep 2027 | The same pattern as Seollal, in far better weather. Seoul’s main palaces and Jongmyo Shrine have opened free of charge during both holidays in recent years. |
| Early May | 5 May · 13 May 2027 | Children’s Day and Buddha’s Birthday. Short breaks that can join a weekend; domestic flights to Jeju sell out. |
| Summer holidays | late Jul – early Aug | The domestic peak for beaches, resorts and Jeju. |
If your trip overlaps a holiday
Arrive in Seoul before the rush starts and stay there. The city empties, most sights stay open (some museums close on the holiday itself), and you get the capital almost to yourself. What you should not do is book an intercity train on the eve of the holiday, or a trip back to Seoul on its last day.
Best time to visit Korea, by what you want
| If you want | Go in | Why |
|---|---|---|
| A first trip | Late September to early November | Stable weather, little rain, autumn colour. Avoid Chuseok week. |
| Cherry blossom in Seoul | The first ten days of April | Book a range; the peak moves with the weather. |
| Autumn colour | Mid-October to early November | The mountains first, Seoul last. |
| Jeju | April to May, or September to October | Mild and dry, outside the summer rush. |
| Busan’s beaches | July to August | Swimming season, with the crowds and humidity that come with it. |
| Skiing, or the lowest prices | January to February | Cold, clear, and cheap outside Seollal. |
What the month does not decide
Check entry requirements whatever the season. Many nationalities that can visit without a visa still need a K-ETA (Korea Electronic Travel Authorization) approved online before boarding. Korea has temporarily exempted a list of countries several times, so check your own passport on the official k-eta.go.kr site rather than going by what a friend needed last year.
If Korea is paired with Japan, the seasons line up well: both are at their best in spring and autumn, and Tokyo’s cherry blossom usually runs about a week ahead of Seoul’s. See the best time to visit Japan. For Southeast Asia, where the logic is dry season against wet rather than warm against cold, see the best time to visit Vietnam and the best time to visit Thailand.
The one-line verdict
For weather, October. For blossom, the first week of April in Seoul. For price, January. Skip July unless rain genuinely does not bother you, and keep your train journeys off Chuseok and Seollal.
One less thing to budget for: tipping in South Korea is almost never expected, and menu prices already include tax and service.
Before you fly, check the paperwork: our K-ETA guide explains who is exempt until the end of 2026 and how the free e-Arrival card works.
Looking for the rest? Every Korea guide we’ve published, from the K-ETA to the won, is sorted by topic in our South Korea travel guide.
Sources
- Korea Meteorological Administration — climate normals for Seoul, 1991–2020, and monsoon onset data.
- Korea Tourism Organization — cherry blossom, foliage and festival calendar.
- AirKorea (Ministry of Environment) — real-time fine dust and yellow dust readings.
- Korea Forest Service — annual autumn foliage forecast.
- K-ETA — Korea Electronic Travel Authorization, official application site.
- Korea Astronomy and Space Science Institute — lunar calendar dates for Seollal and Chuseok.
Data checked: 2026-09-28
