Seoul rewards visitors year-round, but the timing of your trip shapes the experience considerably. Spring cherry blossoms and autumn foliage represent the city’s two peak windows, while summer brings heat and monsoon rains, and winter turns cold but festive. Here is what to expect in each season.
Best Months at a Glance
Spring (March–May) and autumn (September–November) are Seoul’s strongest seasons. Both offer mild temperatures, clear skies, and major visual spectacles - cherry blossoms in spring, golden and red foliage in autumn. Summer works if you accept heat and humidity; winter suits budget travellers and anyone drawn to Christmas or New Year celebrations.
Spring and Autumn: The Best Windows
Spring (March–May) is Seoul’s most celebrated season. Cherry blossoms arrive in late March and peak in the first two weeks of April along the Yeouido Hangang Park cherry blossom path - one of Korea’s most-photographed events - and on the slopes of Namsan. Temperatures climb from around 6°C in early March to a comfortable 18–22°C by May. Crowds build significantly in early April; weekday visits to Yeouido and Namsan are noticeably calmer than weekends.
Gyeongbokgung Palace is free to enter on National Hanbok Day in October, but in spring the palace grounds are simply pleasant on any day, with blossom-lined courtyards. Bukhansan National Park - the most visited national park in the world by area - is ideal from April onwards, once overnight temperatures stop dipping below freezing on the upper trails.
Autumn (September–November) runs the spring season close for overall quality. Temperatures cool from about 23°C in September to 8–12°C by November. Foliage colour begins on the upper slopes of Bukhansan in mid-October and spreads across the palace grounds and Han River parks through November. Visibility is generally better in autumn than spring - the air is drier, and haze is less common. Chuseok (Korean Thanksgiving) falls in late September or October depending on the lunar calendar: check exact dates before booking, as this is Korea’s busiest travel period.
Summer in Seoul
June through August is Seoul’s hottest and most humid period. Daytime temperatures regularly reach 30–35°C, and the jangma monsoon brings heavy rain typically from late June through late July. Rain falls in bursts rather than continuously, so outdoor sightseeing is manageable if you time morning starts and carry waterproof gear.
The summer school holiday period (late July through August) fills Lotte World and Everland theme parks on weekends - queues for major rides can exceed 90 minutes. If theme parks are on your itinerary, arrive at opening or visit on a weekday. The Han River parks see heavy evening use from locals escaping the heat; night markets and outdoor cinema screenings run throughout July and August.
Flights and accommodation are more expensive in peak summer (late July–August), especially during the Korean school holiday window.
Winter in Seoul
December through February is cold and dry. Temperatures typically range from -5°C at night to around 5°C during the day, with occasional snowfall - usually light, though heavier snowstorms occur a few times per decade. The cold is dry rather than damp, which many visitors find easier to cope with than the summer humidity.
January and February bring Seollal (lunar new year), when much of Seoul empties as Koreans travel home. Some restaurants and shops close for 3–5 days around the holiday; major tourist sites including Gyeongbokgung and the N Seoul Tower generally stay open. KTX trains sell out weeks ahead - book as soon as tickets release (typically 1 month before travel dates on Korail’s website).
The Christmas and New Year period sees festive lighting across Myeongdong, Cheonggyecheon stream, and major department stores. Hotel prices spike around 31 December. For pure sightseeing value, January and February are Seoul’s cheapest months: flights and hotels drop significantly after the New Year rush, and major museums are quiet.
Month-by-Month Summary
| Month | Avg Temp | Notes |
|---|---|---|
| January | -3–3°C | Cold and dry; Seollal holiday (check dates); cheap fares |
| February | -1–5°C | Coldest month; Seollal possible; plum blossoms late Feb |
| March | 4–11°C | Early blossoms; warming up; good value |
| April | 9–18°C | Peak cherry blossoms; busiest month |
| May | 14–23°C | Warm, clear; slightly less crowded than April |
| June | 19–28°C | Pre-monsoon; warming fast; manageable |
| July | 24–32°C | Monsoon (jangma); hot and humid |
| August | 25–33°C | Peak heat; school holidays; crowded theme parks |
| September | 20–27°C | Monsoon ends; Chuseok likely; pleasant evenings |
| October | 12–20°C | Foliage begins; National Hanbok Day at palaces |
| November | 5–13°C | Peak foliage; cooling fast; fewer tourists |
| December | -1–6°C | Cold; festive lights; prices rise late December |
Plan Your Trip
Book cherry blossom trips to Seoul at least 6–8 weeks ahead - April hotels near Yeouido fill months in advance. Check exact Chuseok and Seollal dates before finalising any September–February trip, as train and hotel availability changes sharply. Korean Air and Asiana typically offer their cheapest Seoul fares in January and February; budget carriers including Air Premia and T’way Air serve Seoul Incheon and Gimpo from several Asian hubs year-round. For Bukhansan hiking, September through November gives the most reliable trail conditions and the strongest autumn colours on the upper routes.
If you are planning around this, best time to visit Busan, best time to visit Jeju and South Korea Weather in January are worth reading too.