Peep Korea
Travel
Every Season Has a Catch.
Best time to visit Korea, month by month: Seoul highs, lows and rain from KMA normals, cherry blossom and rainy season timing, crowd peaks and 2027 holiday dates.
Most people pick a month from a photo. Pink trees in April. Red maples in October. Then they land in a city where everyone else picked the same photo.
Every season in Korea has a catch. Spring has dust and crowds, summer has rain and heat, autumn has crowds again, and winter has real cold. The trick is choosing the catch you can live with, then picking the right week inside that month.
For weather alone, mid April to early June and mid September to early November. Days are mild and rain is moderate.1 For fewer crowds, look at March, or at January and February with a well-packed bag.
Here is the short version by traveler type:
| You want | Go | The catch |
|---|---|---|
| Mild walking weather | Mid April to early June | Spring dust days, festival crowds |
| Autumn color | Mid October to early November | Busy sights and full hotels (Peep observation) |
| Fewer visitors | January, February | Highs near 2 to 5°C, wind |
| Beaches and long evenings | Late July, August | Heat, humidity, typhoon risk |
| Flowers | Late March to mid April | The bloom moves every year |
Weather from KMA 1991 to 2020 Seoul normals; crowd notes from 2025 arrival data and Peep observation. (ref. 1, 12 to 15)
Q. Is there a month to avoid completely? No. July is the hardest month for sightseeing because of rain, and late January can be bitter. Both still work if you plan indoor days.
Seoul runs from below freezing in January to about 30°C in August, with most of the year's rain falling in July and August. The table uses the Korea Meteorological Administration's 30-year normals for the Seoul station, the figures Korean forecasters compare against.1
| Month | Avg high | Avg low | Rain | Wet days (1 mm+) | In one line |
|---|---|---|---|---|---|
| January | 2.1°C (36°F) | minus 5.5°C (22°F) | 17 mm | 3.3 | Coldest and driest |
| February | 5.1°C (41°F) | minus 3.2°C (26°F) | 28 mm | 3.4 | Still winter, Seollal crowds on the roads |
| March | 11.0°C (52°F) | 1.9°C (35°F) | 37 mm | 4.7 | Cold mornings, first blossoms late in the month |
| April | 17.9°C (64°F) | 8.0°C (46°F) | 73 mm | 6.5 | Cherry blossoms, dust days, pleasant afternoons |
| May | 23.6°C (74°F) | 13.5°C (56°F) | 104 mm | 6.8 | Warm, green, holiday-heavy |
| June | 27.6°C (82°F) | 18.7°C (66°F) | 130 mm | 7.6 | Getting humid; rain starts late in the month |
| July | 29.0°C (84°F) | 22.3°C (72°F) | 414 mm | 13.3 | Rainy season, the wettest month |
| August | 30.0°C (86°F) | 22.9°C (73°F) | 348 mm | 11.8 | Hottest, humid, storms possible |
| September | 26.2°C (79°F) | 17.7°C (64°F) | 142 mm | 6.5 | Warm, drying out, Chuseok |
| October | 20.2°C (68°F) | 10.6°C (51°F) | 52 mm | 4.8 | Crisp, sunny, autumn color starts |
| November | 11.9°C (53°F) | 3.5°C (38°F) | 51 mm | 6.4 | Leaves fall fast, first freeze |
| December | 4.2°C (40°F) | minus 3.4°C (26°F) | 23 mm | 4.2 | Cold, festive lights, short days |
Seoul station, KMA climate normals 1991 to 2020, checked 27 October 2026. Averages, not a forecast.1
Two things the table hides. July's 414 mm does not fall evenly; it comes in heavy bursts with dry gaps between. And a winter "high" of 2°C feels much colder by the river or on a hilltop with wind.
In Seoul and the central region, the rainy season (jangma) normally runs from about 25 June to 26 July, roughly 31 days.2 It reaches Jeju first, around 19 June, and the south around 23 June.2
It shifts every year. In 2026 the central region's rainy season started late, on 1 July, and ended on 26 July, five days shorter than normal.3 KMA called the 2026 dates provisionally after the rain stopped, so treat any early "start date" you read online as an estimate.3
What it means for a trip:
Q. Is the rain over once jangma ends? Not always. August still averages 348 mm of rain in Seoul, often in short, heavy downpours, and typhoons arrive later in the summer.1, 4
Yes, but not many. On the 1991 to 2020 average, about 3.4 typhoons a year affect Korea, mostly in July (1.0), August (1.2) and September (0.8).4 October averages 0.1.
So a typhoon is a risk to plan around, not a reason to cancel a summer trip. If one is forecast:
It is hot and humid, and the humidity is the hard part. Seoul's August averages a high of 30.0°C and a low near 23°C, so nights stay warm.1 Relative humidity sits around 74 to 76% in July and August, against about 55% in spring.1
The good news: subways, malls, museums and cafés are strongly air-conditioned. Do outdoor sightseeing before 11:00 and after 17:00, and spend the middle of the day indoors.
Q. What should I wear in a Korean summer? Breathable fabrics, a light layer for cold air-conditioning, and shoes that can get wet.
Normally around 8 April, with full bloom about two days later, on 10 April.5, 6 That "normal" is a 30-year average, and recent springs have run early: in 2026, Seoul's official tree bloomed on 29 March, ten days ahead of normal.5
Blossoms open earlier in the south and later in the mountains, so the season moves north through late March and April. Private weather companies publish bloom forecasts in late winter, so book flexible dates or a longer window rather than one fixed weekend.
The petals last about a week in any one place. Rain or wind can strip a street in a day.
Q. What about spring dust? Yellow dust (hwangsa) blows in mostly from March to May. Seoul logged it on 9 days in spring 2024 and 6 in spring 2025.7 Separately, Korea runs a seasonal fine dust program from December to March.8 Check an air quality app each morning and keep a mask in your bag for bad days.
Pick one or two that match your dates, then confirm the year's official schedule before you book. Festival dates change every year.
Q. When is the 2027 Lotus Lantern parade? Not announced yet as of 27 October 2026. Based on past years it usually falls on a weekend shortly before Buddha's Birthday. Check the festival's official site in spring.11
Spring and autumn feel the busiest at famous sights (Peep observation), but foreign arrivals peak in summer and autumn. In 2025, about 1.82 million foreign visitors arrived in August and 1.74 million in October, against about 1.12 million in January.12, 13, 14 The full year set a record of about 18.94 million.15
| Month (2025) | Foreign arrivals |
|---|---|
| January | 1,117,243 |
| August | 1,820,199 |
| October | 1,739,020 |
| December | about 1.5 million |
Korea Tourism Organization monthly statistics, as reported in 2025 and January 2026. (ref. 12 to 15)
Arrivals are half the picture. Korean holidays move crowds inside the country, and that is when trains and highways fill up.
Q. Is Seoul empty during Seollal and Chuseok? Quieter in some business areas, busier at palaces, malls and family spots. Many people leave Seoul for their hometowns, so trains and highways out of the city fill up around those dates. Some small restaurants and shops close for a day or two (Peep observation).
Korea's 2027 calendar was published by the Korea AeroSpace Administration on 29 June 2026. The ones that matter most for crowds are Seollal and Chuseok.9, 10
| Holiday | 2027 date | Crowd effect |
|---|---|---|
| New Year's Day | Fri 1 January | Long weekend, 1 to 3 January |
| Seollal (Lunar New Year) | 6 to 8 February, plus Tue 9 February in lieu | Four-day break; trains and roads packed |
| Independence Movement Day | Mon 1 March | Long weekend, 27 February to 1 March |
| Labor Day | Sat 1 May, plus Mon 3 May in lieu | Long weekend, 1 to 3 May |
| Children's Day | Wed 5 May | Family crowds at parks and zoos |
| Buddha's Birthday | Thu 13 May | Temple events |
| Memorial Day | Sun 6 June | Falls on a Sunday, no substitute day |
| Constitution Day | Sat 17 July, plus Mon 19 July in lieu | Long weekend |
| Liberation Day | Sun 15 August, plus Mon 16 August in lieu | Long weekend, peak summer travel |
| Chuseok | 14 to 16 September (Tue to Thu) | Three-day break; trains and roads packed |
| National Foundation Day | Sun 3 October, plus Mon 4 October in lieu | Long weekend |
| Hangeul Day | Sat 9 October, plus Mon 11 October in lieu | Long weekend |
| Christmas | Sat 25 December, plus Mon 27 December in lieu | Long weekend |
From the Korea AeroSpace Administration 2027 almanac and KASI calendar data, checked 27 October 2026. Holiday rules can change by law; check an official calendar before you book.9, 10
Labor Day and Constitution Day were made public holidays from 2026, which is why 2027 has more red dates than older lists online show.9
Q. How do I use this table? Book trains and island flights early if your trip touches any long weekend. If you want quieter sights, avoid the four Seollal days and the three Chuseok days, or plan city-only days around them. For what closes on those days, ask your hotel a week ahead.
Warm, then pleasant. Seoul's September averages a high of 26.2°C and a low of 17.7°C, with about 142 mm of rain, far less than August.1 Early September can still feel like summer; the last third is usually comfortable.
Two things to watch:
Q. Is late September a good time to visit Seoul? Often, yes. It is drier and cooler than August, and in 2027 Chuseok falls mid month, so the last week of September avoids it.
Cold and dry. Seoul's January averages a high of 2.1°C and a low of minus 5.5°C, and cold snaps below minus 10°C are not unusual, so pack for them.1 It also draws far fewer foreign visitors than summer or autumn.12, 13
Why people still choose it:
Pack a long padded coat, thermal layers, gloves and a hat. Walk outdoors in the warmest hours, around 13:00 to 15:00.
Q. Is Seollal in January in 2027? No. In 2027 it falls on 6 to 9 February, including the substitute day.9 January 2027 has only one public holiday, New Year's Day.
Five to seven days in Seoul with one day trip is a comfortable first-trip pace in any season (Peep estimate). In July and deep winter, add a buffer day, because rain or cold will cost you an outdoor day.
Before any trip, check Korea entry requirements. Passports on the K-ETA exemption list are covered until the end of 2026 (31 December); for later trips, check the official K-ETA site before you book.16 Choosing a base? See where to stay in Seoul, and for the first ride into the city, Incheon Airport to Seoul. Heading south too? Our Seoul to Busan KTX guide covers the train.
For weather, mid April to early June and mid September to early November.1 Both are busy, so avoid Korean long weekends inside those windows.
May or October, for mild highs of about 24°C and 20°C.1 Late October adds autumn color; May adds green parks and festivals.
It is the wettest month, with about 414 mm of rain in Seoul.1 It works if you plan indoor anchors and pack quick-dry shoes.
Seoul averages a high of 30.0°C and a low near 23°C.1 Humidity makes it feel hotter, so plan sightseeing early and late in the day.
July to September, with August the most likely month.4 On average about 3.4 typhoons a year affect Korea.
Highs around 26°C, lows around 18°C, and much less rain than August.1 The last third of the month is usually the most comfortable.
Seoul averages a high of 2.1°C and a low of minus 5.5°C.1 Cold snaps below minus 10°C are possible, so pack for them.
Yes, but lightly most years. January averages about 7 snowy days.1 For first snow and December details, see our Seoul in November and December guide.
Dust blown in from inland Asia, mostly from March to May.7 Check air quality daily and carry a mask for high-dust days.
Big malls, chain stores and convenience stores usually stay open (Peep observation). Some small family restaurants and shops close for a day or two, so check before you go.
Yes, for weather. October is crisp and one of the drier months.1 Book rooms early, and see our November and December guide for the late-season detail.
Five to seven days covers Seoul plus one day trip without rushing (Peep estimate). In July or deep winter, keep one spare day for weather.
The current exemption for listed passports ends on 31 December 2026.16 For trips from 1 January 2027, check the official K-ETA site before you book.
Yes, if you pack for it. January is one of the driest months of the year.1 Plan indoor afternoons for the coldest, windiest days.
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