South Korea Seoul Weather in May — Climate Guide
May in Seoul is Excellent
May is Excellent for Seoul.
May is Seoul's most genuinely pleasant month — temperatures 22-25°C / 72-77°F days, 13-15°C evenings, low humidity (60-65%), longer daylight (sunset 7:35 PM). Outdoor culture peaks: Han River parks fill with picnics, late-night cafés open terraces.
Buddha's Birthday (varies year to year — typically early-to-mid May) is a major Buddhist holiday. The Lotus Lantern Festival preceding the holiday illuminates Insadong, Jogyesa Temple, and the Cheonggyecheon Stream with 50,000+ traditional lanterns. The festival parade through Jongno is one of Asia's most beautiful religious events. Free public viewing.
Travel score
Seoul May Weather Stats
Avg High
23°C
Avg Low
13°C
Rainy Days
9
105mm total
Sunshine
8h
Daily avg
Humidity
64%
Comfortable
UV Index
8
Very high
Wind
12 km/h
Gusts 23
Crowds
Busy
At attractions
May Sunrise & Sunset
Air Quality
PM2.5
27 μg/m³
PM10
42 μg/m³
Status
Moderate
Feels-Like Temperature & Wind
Feels like
Daytime
23°C
Nighttime
13°C
Humidity and wind affect how the actual temperature feels.
Wind
12 km/h
Max gust 23 km/h
Activities Recommended for May
May Travel Pros & Cons
Pros
- Best weather of the year (22-25°C, low humidity)
- Lotus Lantern Festival
- Long daylight (sunset 7:35 PM)
Cons
- Hotel prices match April peak
- Children's Day brings family crowds at theme parks
- Late May humidity climbing
May Events & Festivals
- Buddha's Birthday (varies — typically early-to-mid May) — major Buddhist holiday
- Lotus Lantern Festival (preceding Buddha's Birthday) — Insadong illuminated
- K-Pop concert season picks up
- Children's Day (May 5) — public holiday
Seoul in May — Full Picture
May is Seoul's most genuinely pleasant month — temperatures 22-25°C / 72-77°F days, 13-15°C evenings, low humidity (60-65%), longer daylight (sunset 7:35 PM). Outdoor culture peaks: Han River parks fill with picnics, late-night cafés open terraces.
Buddha's Birthday (varies year to year — typically early-to-mid May) is a major Buddhist holiday. The Lotus Lantern Festival preceding the holiday illuminates Insadong, Jogyesa Temple, and the Cheonggyecheon Stream with 50,000+ traditional lanterns. The festival parade through Jongno is one of Asia's most beautiful religious events. Free public viewing.
Children's Day (May 5) is a public holiday — Korean families fill amusement parks (Lotte World, Everland, Seoul Land), zoos, and beaches. Hotels in Gyeongju and beach areas spike. Seoul itself less affected.
K-Pop concerts begin ramping up — many international tours kick off in Seoul. Major venues (Olympic Hall, Gocheok Sky Dome) host BTS, BLACKPINK, IU, NewJeans-level acts. Tickets sell out in minutes through fan-club lottery.
May weather is genuinely peak. Cherry blossoms gone but azaleas and roses bloom. Late May begins humidity creep toward summer. Hotel prices remain at spring peak.
What to Wear & What to Pack
Spring/light summer — short sleeves with light cardigan. Daytime warm (23-25°C), evenings cooler (13-15°C). Sunscreen essential.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
Current17.3°C
7°C
8/mo
Summer (Jun·Jul·Aug)
29.7°C
20.7°C
13.3/mo
Autumn (Sep·Oct·Nov)
19°C
9.3°C
7.3/mo
Winter (Dec·Jan·Feb)
3.7°C
-4.7°C
5.3/mo
Seoul Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 2° | -6° | 6d·21mm | 5.5h | 60% | 2 | Quiet | Low season | |
| 5° | -4° | 5d·23mm | 6h | 58% | 3 | Quiet | Low season | |
| 11° | 1° | 7d·49mm | 7h | 58% | 4 | Moderate | Shoulder | |
| April (Best) | 18° | 7° | 8d·70mm | 7.5h | 60% | 6 | Very busy | Peak |
| May (Best) | 23° | 13° | 9d·105mm | 8h | 64% | 8 | Busy | Peak |
| 28° | 18° | 10d·130mm | 7.5h | 70% | 9 | Moderate | Shoulder | |
| 30° | 22° | 16d·405mm | 4.5h | 78% | 9 | Moderate | Shoulder | |
| 31° | 22° | 14d·290mm | 5.5h | 75% | 9 | Busy | Peak | |
| 27° | 17° | 10d·165mm | 6.5h | 72% | 7 | Busy | Peak | |
| October (Best) | 19° | 9° | 6d·50mm | 7h | 65% | 5 | Very busy | Peak |
| 11° | 2° | 6d·50mm | 6h | 65% | 3 | Moderate | Shoulder | |
| 4° | -4° | 5d·22mm | 5h | 65% | 2 | Moderate | Shoulder |
View Other Months
Seoul May Hotel Picks
Frequently Asked Questions
Is May a good time to visit Seoul?
Seoul in May is Excellent. Tourist crowds are busy and flight/hotel prices are peak.
What's the average temperature in Seoul in May?
Seoul May averages a high of 23°C and a low of 13°C.
Does it rain much in Seoul in May?
Seoul May averages 105mm of rainfall over about 9 rainy days.
What should I wear in Seoul in May?
Spring/light summer — short sleeves with light cardigan. Daytime warm (23-25°C), evenings cooler (13-15°C). Sunscreen essential.
What time are sunrise and sunset in Seoul in May?
Seoul May sunrise is 05:18 and sunset is 19:35, with 14h 17m of daylight.
What's the air quality like in Seoul in May?
Seoul May air quality (AQI) averages 65, rated Moderate. PM2.5 averages 27μg/m³.
What activities are recommended in Seoul in May?
In May, Seoul is great for Lotus Lantern Festival, Han River park picnics, K-Pop concerts.
Is May peak season in Seoul?
Seoul May crowds are busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Seoul
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.