Best Time to Visit Seoul
The best time to visit Seoul is October. You get crisp air, clear blue skies, and peak autumn foliage without the summer humidity or winter bite. October bridges the gap between the scorching heat of July and the sub-zero temperatures of January. Rainfall is minimal, making it ideal for walking through palace grounds or hiking Bukhansan. While April is popular for cherry blossoms, it is plagued by "yellow dust" pollution and unpredictable crowds. October offers the most stable weather and the best visual experience across the city.
Month by Month
January in Seoul
January is the coldest month. Temperatures range from -6°C to 2°C (21°F to 36°F), but wind chill often makes it feel significantly colder. This is the low season for tourism, excluding the Lunar New Year (Seollal) period. Prices for hotels are at their lowest. You should head to an indoor skating rink or take a day trip to nearby ski resorts like Vivaldi Park. Bring a heavy down parka; the dry Siberian winds are unforgiving.
February in Seoul
Expect slightly warmer but still freezing conditions, ranging from -3°C to 5°C (26°F to 41°F). February is extremely dry. Crowds remain thin, and flight deals are common. This is the best time to visit indoor attractions like Lotte World or the COEX Aquarium. If Seollal falls in February, expect many local shops to close for three days, though major palaces and museums usually offer traditional game events for tourists.
March in Seoul
The transition to spring begins. Temperatures climb to between 1°C and 11°C (34°F to 52°F). The landscape is still mostly brown, but the first plum blossoms appear late in the month. March is notorious for "fine dust" (yellow dust) blowing in from the Gobi Desert, so high-quality masks are a necessity. Hiking trails start to get busy on weekends as locals emerge from hibernation. The weather is unpredictable; carry layers.
April in Seoul
April is peak cherry blossom season. Temperatures are pleasant, ranging from 7°C to 18°C (45°F to 64°F). This is one of the busiest months for tourism. Hotel prices spike, and popular spots like Yeouido Park are packed. The air quality remains a concern, but the visual of the city in full bloom compensates for it. Visit the Seokchon Lake Cherry Blossom Festival for the best views, but arrive before 9:00 AM to beat the crowds.
May in Seoul
May offers the best spring weather before the humidity hits. Temperatures sit comfortably between 13°C and 23°C (55°F to 73°F). The city is lush and green. One of the highlights is the Lotus Lantern Festival (Yeon Deung Hoe), celebrating Buddha’s Birthday with a massive parade through central Seoul. It is less crowded than April but more expensive than the winter months. This is prime outdoor dining weather in districts like Ikseon-dong.
June in Seoul
Summer begins with temperatures between 18°C and 27°C (64°F to 81°F). The air becomes noticeably more humid. June is the calm before the monsoon season. It’s a great month for nighttime activities, such as visiting the Banpo Bridge Rainbow Fountain. Crowds are moderate as most international students and families haven't started their summer breaks yet. Evening picnics along the Han River are a staple June activity.
July in Seoul
July is hot, humid, and wet. This is the start of the Jangma (monsoon season). Temperatures range from 22°C to 29°C (72°F to 84°F), but the humidity makes it feel like 35°C. Heavy downpours occur frequently. Flight prices remain high due to summer holidays. The best thing to do is explore underground shopping malls like the one at Gangnam Station or visit the "K-Style Hub" to stay dry and cool.
August in Seoul
August is the hottest month and the peak of the domestic vacation season. Temperatures fluctuate between 23°C and 30°C (73°F to 86°F), often hitting higher peaks. Heat warnings are common. Expect long lines at every major attraction and high prices for accommodations. To escape the heat, join the locals at a Jjimjilbang (Korean spa) for a cold soak and shaved ice (Bingsu). Avoid strenuous hiking during midday hours.
September in Seoul
The humidity breaks mid-month. Temperatures range from 17°C to 26°C (63°F to 79°F). Early September can still see typhoons or heavy rain, but the end of the month is spectacular. If Chuseok (Korean Thanksgiving) falls in September, out-of-town travel becomes nearly impossible as the city empties and transport sells out months in advance. Many restaurants and markets close for the holiday, so check schedules before you move.
October in Seoul
October is the gold standard for Seoul travel. Temperatures are a perfect 10°C to 20°C (50°F to 68°F). The sky is consistently clear. The fall foliage begins in late October, turning the palace grounds like Gyeongbokgung into a heavy mix of orange and gold. High demand means you should book hotels at least three months in advance. Attend the Seoul International Fireworks Festival at Yeouido for a world-class display.
November in Seoul
The first half of November still offers vibrant autumn colors. Temperatures drop quickly, ranging from 3°C to 12°C (37°F to 54°F). By late November, the trees are bare and the winter chill starts to set in. Crowds thin out significantly after the first week. This is the best time for photography at the Seoul Lantern Festival along Cheonggyecheon Stream, where hundreds of illuminated sculptures light up the waterway.
December in Seoul
Seoul embraces the winter holidays with massive light displays. Temperatures range from -4°C to 4°C (25°F to 39°F). While it’s cold, the air is dry and the city is festive. Myeongdong becomes a hub for Christmas lights and street food. Domestic tourism increases around Christmas and New Year's Eve, but mid-December is relatively quiet. Go to the Lotte World Mall for the most ostentatious holiday decorations in the city.
Cheapest Time to Visit Seoul
The cheapest time to visit Seoul is from January to February. Following the New Year festivities and before the start of the school year in March, tourism hits a lull.
- Flights: Airlines frequently offer discounted fares to Fill seats during the freezing winter months.
- Accommodation: Even high-end hotels in Myeongdong and Gangnam drop their rates by 20-30% compared to the October peak.
- Shopping: The "Korea Grand Sale" usually takes place in January and February, offering deep discounts specifically for foreign tourists on retail, transport, and attractions.
Avoid the week of Seollal (Lunar New Year) as domestic travel increases and some prices may fluctuate, though overall costs remain lower than in spring or autumn.
When to Avoid Seoul
Avoid Seoul in late July and August.
The combination of the monsoon season (Jangma) and peak humidity makes outdoor sightseeing miserable. You will fluctuate between being drenched by torrential rain and sweating through your clothes in 90% humidity. Furthermore, this coincides with the school summer break. Theme parks, museums, and public transport are at their most congested. Prices for flights and hotels are at a premium.
If you must visit in summer, plan an itinerary that relies heavily on air-conditioned indoor spaces like the National Museum of Korea or the various underground malls.
Best Time for Good Weather
For the most stable, pleasant weather, visit in May or October.
- May: You get the warmth of late spring without the rain. Air quality is generally better than in March or April. The city is in full bloom, and you can walk for hours without needing a heavy coat or an umbrella.
- October: This is the most reliable month. You will experience the "high blue skies of autumn" that Korea is famous for. Humidity is non-existent, and the temperature is ideal for the city’s hilly terrain. It is the best time for hiking the Seoul City Wall trail.
Best Time for Fewer Crowds
To avoid the masses, aim for late February to early March or late November.
These are "shoulder-to-low" seasons where the weather is transitionary and less appealing to the general public.
- Late February: The deep freeze is ending, but the spring tourists haven't arrived. You can walk through the Bukchon Hanok Village without the typical hordes of selfie-takers.
- Late November: The autumn foliage travelers have departed, and the Christmas crowds haven't yet gathered. You will have shorter wait times at popular restaurants in Hongdae and easier access to N Seoul Tower.
Always check the dates for Chuseok and Seollal. These holidays move according to the lunar calendar. During these times, while the city of Seoul itself can feel empty as locals leave for their hometowns, transport out of the city is impossible to book, and many independent businesses close their doors.