Seoul transforms between September and November into one of the most photogenic cities in Asia. The summer humidity clears, the sky turns a deep, crisp blue, and the mountains ringing the city ignite with red, orange, and amber. Rainfall drops to its lowest levels of the year, and long stretches of clear, sunny days make outdoor exploration genuinely pleasant from morning to evening.

Koreans regard autumn as the peak season for travel, and it is easy to see why. Historic palaces, riverside parks, and granite mountain trails all look their finest when framed by changing leaves. The temperature range across the three months means you can visit at any point and find a distinct atmosphere, from the lingering warmth of early September through to the bracing cold of late November.

For international visitors arriving on flights into Seoul, the autumn window offers an ideal combination of comfortable conditions and cultural richness that no other season matches.

September sits at the tail end of summer, with average daytime temperatures ranging from 17°C to 25°C. The air is noticeably drier than August, and the oppressive humidity of Korean summer fades quickly after the first week. Evenings cool down to around 14°C to 17°C, making outdoor dining and late-night street food exploration comfortable without heavy layering.

A light jacket or long-sleeved layer is all you need for evenings in September. Daytime is often warm enough for short sleeves, though carrying a thin outer layer is wise as temperatures can shift once the sun sets. The Han River parks and outdoor markets are at their liveliest this month as locals seize the last of the warm weather before the season fully turns.

October is the crown jewel of Seoul's autumn. Average temperatures range from 10°C to 19°C, delivering the kind of crisp, energising days that make long hikes and palace visits feel effortless. The foliage typically begins its turn in the mountains in early October, cascading down into the city streets by mid-month and reaching peak colour in the final week of October and the first days of November.

A medium-weight coat or structured jacket is the right choice for October days, with a scarf and light layers for evenings when temperatures regularly dip below 10°C. Rainfall is minimal throughout the month, and clear skies dominate, making October the single best month to photograph Seoul's blend of ancient palaces and modern skyline against a canopy of autumn colour.

November brings a genuine chill to Seoul, with average temperatures falling between 3°C and 12°C. Early November still holds some of the best foliage in lower-altitude city parks and riverside paths, while mid-November marks the transition toward winter. The city empties of the peak autumn crowds from October, which means shorter queues at palaces and viewpoints for those willing to dress warmly.

A warm coat, gloves, and a hat become genuinely necessary by mid-November. Layering is the key strategy: the indoor temperature in museums, cafes, and subway stations is always well-heated, so visitors who can add and remove layers throughout the day will be most comfortable. The Seoul Lantern Festival, held along Cheonggyecheon Stream, illuminates November evenings and provides one of the season's most memorable experiences.

Book your accommodation early for the autumn season, as demand across the city is high. Hotels in central neighbourhoods like Myeongdong and Gangnam fill quickly during peak foliage weeks.

Bukhansan is a granite mountain rising to 836 metres that sits directly on Seoul's northern boundary, one of the most visited national parks in the world by visitor density. What makes it exceptional in autumn is the contrast between bare grey granite peaks and the blazing reds and golds of the maple forest that fills the valleys below. The peak foliage window falls between late October and the first week of November, when the entire mountainside appears to glow from a distance.

The most accessible trail for leaf viewing is the Bukhansanseong fortress wall trail from Bukhansanseong Station on Line 3, which weaves through dense forest and offers multiple viewpoints without requiring a full summit ascent. For those with more time and energy, the hike to Baegundae Peak takes roughly three hours return and rewards the effort with panoramic views over a city-wide sea of colour. Weekdays are strongly preferable in October, as weekend crowds on the main trails can be substantial.

Changdeokgung Palace is a UNESCO World Heritage Site built in the early fifteenth century, and its rear garden, known as Huwon or the Secret Garden, is arguably Seoul's single most beautiful autumn destination. The 78-acre garden contains hundreds of old trees, lotus ponds, and pavilions set across a wooded hillside, and when the maples and ginkgos turn in mid-October, the effect is extraordinary. Entry to the Secret Garden requires a separate guided tour ticket priced at 5,000 KRW, with only 100 spots available per session.

Tours must be booked online in advance, with slots opening at 10:00 AM Korean Standard Time six days before your chosen date. Autumn tour slots sell out within hours of opening, particularly on weekends between mid-October and mid-November. The guided format keeps groups small and the experience intimate, which makes the Secret Garden feel genuinely secluded even at the peak of the tourist season.

Nami Island sits on the North Han River about 80 kilometres east of Seoul and is renowned for its long, straight tree-lined paths that become tunnels of golden ginkgo and fiery maple in autumn. The island covers roughly half a square kilometre and is vehicle-free, giving it a peaceful, unhurried atmosphere that contrasts sharply with the energy of central Seoul. Peak colour typically arrives in the third week of October and holds through the first two weeks of November.

Access from Seoul is straightforward via the ITX-Chuncheon train from Cheongnyangni or Sangbong Station to Gapyeong, followed by a short taxi ride and ferry crossing to the island. The ferry crossing itself takes only a few minutes but adds a charming arrival ritual that visitors consistently remember. Nami Island makes an ideal full-day excursion from Seoul, pairing well with a stop at Petite France or the Garden of Morning Calm in the same area.

Exploring these foliage sites is made easy when you book your activities in advance through Traveloka.

The 31st Busan International Film Festival, held from October 6 to 15, 2026, is the most prestigious film festival in Asia and draws directors, actors, and film lovers from across the world to the coastal city of Busan, roughly 325 kilometres south of Seoul. The festival screens approximately 200 to 300 films from over 60 countries, spanning premieres, retrospectives, and the New Currents competition that highlights emerging Asian directors. The main venues are centred in the Haeundae district, including the landmark Busan Cinema Center.

Travelling from Seoul to Busan for the festival is straightforward via the KTX high-speed train, which covers the distance in approximately two hours and fifteen minutes. Many visitors combine the festival with a broader autumn trip that begins or ends in Seoul, taking advantage of the foliage season across both cities. Tickets for individual screenings are affordable and available through the official festival website, making this an accessible cultural event for visitors at any budget.

The Seoul Lantern Festival transforms the 5.8-kilometre Cheonggyecheon Stream into a glowing corridor of traditional hanji paper lanterns each November, drawing hundreds of thousands of visitors over its multi-week run. The lantern displays are themed each year around Korean history, folklore, and contemporary cultural motifs, with enormous sculptures stretching across the stream and reflecting off the water below. The festival typically runs from mid-November into December, with exact 2026 dates to be confirmed by Seoul Metropolitan Government in September 2026.

The stream runs through the heart of central Seoul, accessible from Gwanghwamun and multiple subway stations along its length, making the festival easy to incorporate into any evening itinerary. The combination of cool November air, lantern light, and the gentle sound of the stream creates an atmosphere that feels entirely distinct from the daytime city. Arriving on a weeknight rather than a weekend significantly reduces the crowd density along the most popular sections near Cheonggye Plaza.

September calls for light layers: a thin jacket or cardigan for evenings, comfortable walking shoes, and a versatile top that works across the 15-degree temperature swing from midday to midnight. The weather remains warm enough during the day that heavy outerwear would feel cumbersome on long days of sightseeing.

October demands a step up: a structured medium coat, a scarf, and layers underneath for evenings below 10°C. Comfortable, grippy walking shoes become especially important for anyone planning mountain hikes at Bukhansan or Nami Island, where trails can be uneven and leaf-covered ground can become slippery after rain.

November requires a proper warm coat, thermal underlayers for outdoor evenings, gloves, and a hat for mid-month onward. The day-to-night temperature swing in November is significant, so a coat that can open up during a sunny afternoon and close fully for a late-night lantern festival walk is ideal. Lip balm and moisturiser are practical additions, as the air becomes notably drier as the season progresses toward winter.

Getting from Incheon Airport to your hotel is easy with a pre-booked airport transfer, and exploring beyond the subway network is even more convenient with a car rental for day trips to Nami Island or further afield.

Traveloka is Southeast Asia's leading travel platform, trusted by over 100 million users to book every part of their journey in one place. For a Seoul autumn trip, the platform covers everything from international flights and central hotels to guided palace tours and foliage excursions. The eSIM product means you can arrive in South Korea with data already active on your phone, and travel insurance options give you flexibility should seasonal conditions affect your plans.

The standout advantage for an autumn Seoul trip is the breadth of the activities catalogue, which includes timed-entry tickets, guided tours, and day-trip packages to foliage destinations outside the city — all bookable in a single session without switching between platforms. Check Traveloka promotions for seasonal deals on Seoul hotels and flights, and download the Traveloka app to manage your entire itinerary from departure to return.