Best time to visit South Korea: blossom, monsoon, foliage and snow

Four seasons in a small country

VisitKorea, the Korea Tourism Organization's official site, describes Korea as a mid-latitude country with a temperate climate and four distinct seasons: clear and mild weather in spring and autumn, hot and humid summers and cold, dry winters. It also notes that, apart from the islands, temperatures do not differ much between regions. The yearly average runs from about 7°C at Daegwallyeong in the Gangwon mountains to about 15°C in Busan, August is the hottest month and January the coldest.

The monthly averages on the same page show how wide the swing is. In Seoul, the average high is around 30°C in August, and the average low is −5.5°C in January. Busan, on the south coast, is milder in winter: its January average low is just below freezing (−0.1°C) and its average high 8.2°C. So one wardrobe will not cover a year in Korea, but within one season you can move between Seoul, Gyeongju and Busan without changing your plans for the weather.

For travelling on foot, VisitKorea recommends spring (March to May) and autumn (September to November). Summer (June to August) suits beaches and water activities, and winter (December to February) is for snowy mountains, hot springs and skiing. Its weather advice adds one caution for every season: patterns have been changing with climate change, so check the real-time forecast during your trip and be ready for unexpected rain or extreme heat.

Spring: follow the cherry blossom north

Spring is the flower season: forsythia, cherry blossom, azalea and later roses. The blossom moves up the peninsula from south to north, which gives you a natural route. VisitKorea's 2026 cherry blossom forecast, credited to the forecaster Weather i, gave first blooms on Jeju and in Busan around 25 March, Jeonju and Gyeongju around 28 March, Gangneung around 1 April, Seoul around 3 April and Incheon around 7 April. Peak bloom comes about a week after the first flowers, so the forecast put full bloom in Jeju after 1 April and in Seoul around 10 April.

Those are one year's dates, and VisitKorea notes that actual dates depend on the weather; the 2026 forecast was published on 26 February. If your dates are fixed, the safest plan is to spread the trip: Busan or Gyeongju at the end of March, then Seoul in the first half of April. If you can only be in one place, check the new forecast before booking: in 2026 it put Seoul's peak around 10 April.

Two spring cautions. VisitKorea warns that chilly weather often continues until mid-March, so bring a proper jacket for early spring. The Seoul Metropolitan Government adds that temperatures can drop sharply after dark, that the air can be very dry and that spring brings yellow dust, for which it suggests sunglasses and a mask. Keep outdoor plans flexible on hazy days.

Summer: rainy season, heat and beaches

Summer is hot and partly wet. VisitKorea says the season overlaps with the rainy season, so if you visit from the end of June to the end of July you should check the forecast in advance, and that several typhoons pass between June and October. The hottest and most humid stretch is from the end of July through August, when it advises watching for typhoon and heavy-rain advisories before and during the trip. The Seoul government describes the capital's summer as long, hot and humid, interrupted by monsoon rain in June and July, and somewhat quieter than usual because many Koreans go away on holiday.

The upside is the coast. Korea is surrounded by sea on three sides, and VisitKorea counts around 280 beaches; they are open all year but become livelier from mid-June, when they are run with a focus on safety and cleanliness. Each beach sets its own swimming period: in 2025 VisitKorea listed 21 June to 14 September for Haeundae in Busan, 1 July to 31 August for Gwangalli, and from late June or early July to mid- or late August for Gyeongpo in Gangneung and Sokcho Beach. Check the current year's dates before planning a beach week.

A practical summer plan: keep a Seoul stay to palaces in the morning and museums or markets in the heat of the afternoon, then spend the second half of the trip on the coast in Busan or Gangneung. Book flexible rooms and transport around any typhoon warning. Boat trips are the first thing to go: on Jeju, for example, VisitKorea notes that the Seogwipo cruise does not sail during typhoon warnings.

Autumn: foliage from Seoraksan to Hallasan, and festival season

VisitKorea calls autumn a beautiful season even without special events, with average temperatures around 15°C. The foliage moves the opposite way to the blossom, from the high north-east down to the south and Jeju. Its 2026 foliage forecast (credited to Weatheri) gave the first colour on Seoraksan on 3 October, then Bukhansan on 23 October, Jirisan on 28 October and Hallasan on 31 October, with peak foliage across the country from mid-October to early November: Seoraksan around 25 October, Bukhansan around 4 November, Jirisan around 5 November, Naejangsan around 11 November and Hallasan around 13 November.

That gives a simple route for a two-week autumn trip: Sokcho and Seoraksan in the third or fourth week of October, then Seoul, where VisitKorea names Gyeongbokgung, Seoul Forest, Olympic Park and N Seoul Tower among the foliage spots, and the south in early to mid-November: VisitKorea names Bulguksa in Gyeongju among its foliage spots, and Naejangsan was forecast to peak around 11 November. VisitKorea warns that the Seoraksan cable car is crowded at weekends, on public holidays and in the foliage season, so do the famous hikes and rides on a weekday and plan ahead. On Seoraksan, VisitKorea also notes that many upper trail sections close during the forest-fire prevention periods, so check the Korea National Park Service before planning a summit hike.

Autumn is also the busiest festival season. VisitKorea's 2026 list included the Andong Maskdance Festival (24 September to 4 October), the Suwon Hwaseong Festival (4 to 11 October), the Jinju Namgang Yudeung (lantern) Festival (3 to 18 October), the Busan International Film Festival (6 to 15 October) and the Gangneung Coffee Festival (21 to 25 October). Festival weeks fill local hotels, so book early if a festival falls on your dates, and expect each year's dates to move.

Winter: cold, clear and good for skiing

Korean winters are cold. VisitKorea gives an average winter temperature of 0 to 1°C, often falling well below zero, and explains that the northerly wind from Siberia brings intense cold, so pack thick outerwear and be ready for cold waves. The Seoul government describes strong winds, icy air and short days in the capital.

It is still a good season if you plan for it. Snowy mountain walks, hot springs, ondol-heated rooms and warm soups are the winter pleasures VisitKorea highlights, and Myeongdong's Christmas decorations and street food are the Seoul government's winter suggestion. For skiing, Gangwon State is the main area: VisitKorea describes it as known for heavy snowfall, lists Mona Yongpyong in Pyeongchang as Korea's first and largest ski resort, with 28 slopes and 14 lifts, and says that from December to February, the peak ski season, accommodation and shuttle buses should be reserved in advance. Opening dates and slopes depend on snow and weather, so check each resort's official site.

If you dislike the cold, put more of a winter trip in Busan, which has the mildest winter of the three cities in VisitKorea's table, and keep Seoul for indoor sights, markets and evenings.

Seollal and Chuseok: the two holidays to plan around

The national holidays change a trip as much as the weather. VisitKorea explains that Seollal, the Lunar New Year, falls on the first day of the lunar calendar and typically in February, and Chuseok, Korean Thanksgiving, on the 15th day of the eighth lunar month, usually in September or October. Each holiday period lasts three consecutive days, and many Koreans travel back to their hometowns, so expect busy long-distance trains, buses and domestic flights around those days and book early.

There is a benefit for visitors who stay put: VisitKorea says palaces, museums and folk villages hold holiday events and that many royal palaces offer free admission during the Seollal and Chuseok holidays. A holiday week spent in Seoul, with the long-distance travel done before or after it, can work well. The other traditional date worth knowing is Dano, on the fifth day of the fifth lunar month and usually in June, celebrated above all at the Gangneung Danoje Festival, which is on UNESCO's Intangible Cultural Heritage list.

South Korea month by month

This is an editorial summary of the official climate guide and the 2026 forecasts above, not a weather forecast. Exact blossom, foliage and festival dates move every year.

• January and February: the coldest months; skiing in Gangwon State, snowy palaces in Seoul, milder days in Busan. Seollal usually falls in February.
• March: chilly until mid-month; first cherry blossom on Jeju and in Busan towards the end of the month.
• April: blossom in Gyeongju, Gangneung and then Seoul; the best all-round month for a first trip, with cool evenings and some yellow-dust days.
• May: warm, green and still comfortable for walking before the summer humidity.
• June: beaches open from mid-June; the rainy season usually starts towards the end of the month; Dano usually falls in June.
• July and August: rain until late July, then the hottest, most humid weeks; the beach and holiday season; watch typhoon warnings.
• September: still warm, with typhoons possible; Chuseok usually falls in September or October.
• October: foliage begins on Seoraksan early in the month and peaks there late in the month; the main festival month.
• November: foliage peaks in the centre and south (Bukhansan, Jirisan, Naejangsan) and on Hallasan; days shorten and nights get cold.
• December: winter sets in; the ski season starts and Seoul turns to Christmas lights and warm street food.