Weather in South Korea in May

The weather in South Korea in May is warm, dry and ideal for outdoor exploration. Average temperatures hit highs of between 68°F and 75°F (20°C to 24°C), with lush greenery replacing the beautiful cherry blossom of April. This friendly climate makes Korea in May ideal for hiking in national parks like Seoraksan or exploring islands like Jeju. Rain is still relatively rare and the good news is that the air quality is generally pretty good, which can be an improvement over the winter months and early spring. Comfortable and pleasant, May sees both city events and countryside festivals come to life. Dress in layers during the day and pack a light jacket for cooler evenings. It’s one of the best all-around months for a well-balanced, activity-packed itinerary.

South Korea in May at a glance

The weather in South Korea in May is dry and warm, making it very good for all kinds of outdoor adventures and city sightseeing. It’s one of the most comfortable and scenic months to explore the country.

• In Seoul, temperatures range from 55°F to 75°F (13°C to 24°C), with southern regions and Jeju Island reaching up to 77°F (25°C). 
• Across the country, humidity is low and skies are usually clear.
• Spring flowers give way to lush greenery, making this a perfect time for mountain hikes, island hopping and city strolls.
• National parks, temples and cultural sites are in full bloom, with festivals and outdoor events adding extra charm.
• Travel costs are moderate and availability remains good, although prices can rise around early May vacations like Children's Day.
• Tourist numbers can become minorly problematic, especially at nature spots and coastal towns, but overall the atmosphere remains pleasant rather than overwhelming.

Is May a good time to visit South Korea?

May is hands down one of the best times to visit South Korea. Spring is in full swing, bringing warm sunny days, blooming landscapes and hardly any rain. In Seoul, temperatures range from 55°F to 75°F (13°C to 24°C) and it’s even milder down south and on Jeju Island.

It’s the perfect season to get outside. Hiking trails are in great shape, city parks are bursting with color and traditional villages look picture-perfect surrounded by fresh greenery. Festivals focused on nature, food and culture take place all over the country — ideal highlights for any South Korea itinerary.

South Korea in May is also pleasant because the month skips the heavy humidity of summer but still gives you long daylight hours and great weather for exploring. It’s generally not too crowded either, though early May vacations like Children’s Day can bring a surge of domestic travel. Prices stay reasonable overall, especially compared to the busy summer. If you’re looking for that sweet spot of great weather, local events and vibrant scenery, May delivers in full.

Average daily temperatures in May

May brings ideal weather across South Korea. It’s warm without being hot, cool at night and full of sunshine.

In Seoul, average highs hit 75°F (24°C) and lows sit around 55°F (13°C). Days are comfortable and dry, making it a great time to explore the city on foot or head to the hills for a hike.

Central spots like Daejeon and Andong enjoy similar temperatures. Highs range from 74°F to 77°F (23°C to 25°C) and nighttime lows stay close to 54°F (12°C). This is the kind of weather that suits almost any plan, from sightseeing to sitting on a sunny café terrace.

Down south, Busan and Yeosu get a bit warmer. Highs can reach 79°F (26°C) and lows are mild at around 59°F (15°C). The sea starts to warm up too, and beaches and waterfront cafés become much livelier. Jeju Island enjoys early summer vibes, with temperatures from 59°F to 75°F (15°C to 24°C).

Even the mountains are welcoming in May. Highs in those regions range from 59°F to 66°F (15°C to 19°C) and evenings stay cool but not cold. May’s mix of stability, warmth and fresh air makes it one of the best months to experience South Korea’s variety of landscapes.

What about the crowd and cost?

May is a popular month in South Korea thanks to the weather and a handful of national vacations. It’s not quite high season, but it definitely gets busier during long weekends, especially around Children’s Day and Buddha’s Birthday.

Popular parks, cities and nature spots tend to fill up with local families and travelers from abroad. Hotel prices rise during these peak days but midweek stays still offer decent value. If you’re planning a trip to South Korea over a vacation, it’s best to book ahead.

Even with the uptick in visitors, the warm weather and bright scenery make May a great time to be out and about. A little planning goes a long way and most places still feel relaxed outside of the main celebration dates.

Things to do in South Korea in May

May is one of the most pleasant months to visit South Korea. With warm, dry weather and long daylight hours, the country is alive with color, energy and outdoor possibilities — from coast to mountain and across many of the best places to visit in South Korea.

Hike in national parks

This is prime hiking season. Seoraksan, Jirisan and Bukhansan are all great picks, offering clear skies, blooming flowers and mountain air without the crowds or heat of summer.

Take a bike ride along the Han River

Seoul’s riverside bike paths are in full bloom this time of year. Rent a bike at Yeouido or Ttukseom and enjoy an easy ride with parks, flowerbeds and the city skyline rolling by.

Visit tea plantations in Boseong

The green tea fields in Boseong are glowing in May. You can wander between the arguments, sip freshly brewed tea and enjoy panoramic views over rolling hills and countryside — one of the most peaceful things to do in South Korea this time of year.

Go island hopping in Tongyeong

Off the southern coast, the maritime city of Tongyeong is a gateway to quiet islands and coastal scenery. Ferries connect nearby islets with small fishing villages, scenic trails, and peaceful seafront cafes.

Enjoy outdoor cafés and rooftops

Rooftop cafés have always been popular in cities like Seoul and Busan, and never more so, it seems, than in May. Head up for views of the skyline and blooming terrace yards. After all, it's the perfect month to sip iced drinks and soak in the sunshine.

Festivals and events in South Korea in May

May is full of festivals that make the most of the weather, from lantern-lit temples to hands-on nature experiences. It’s a month of celebration and color all across the country.

• Buddha’s Birthday (Seokga Tansinil): Temples like Jogyesa in Seoul and Bulguksa in Gyeongju are covered in colorful lanterns. Expect peaceful ceremonies, family celebrations and beautiful nighttime displays.
• Damyang Bamboo Festival: Held in the famous bamboo forest of Damyang, this festival includes bamboo crafts, food stalls and relaxing forest walks. It’s a lovely escape into nature and a great excuse to explore the region.
• Children’s Day: On May 5, families celebrate with visits to parks, zoos and museums. Many places host concerts, puppet shows and special activities. Some attractions even offer free entry for kids.
• Tongyeong Hansan Battle Festival: This historical festival celebrates Admiral Yi Sun-sin’s victory at sea. Watch costumed parades, naval reenactments and fireworks by the harbor. It’s a big event in a small city with lots of local pride.