South Korea Seoul Weather in August — Climate Guide
August in Seoul is Average
Seoul Weather in August — Quick Answer
As of 2026- Avg temp
- 31° / 22°
- Rainfall
- 290mm · 14 days
- Crowds
- Busy
As of 2026, Seoul in August averages a high of 31°C and low of 22°C with 290mm of rain over about 14 days. Light tropical-style clothing. Quick-dry fabrics. Light cardigan for AC restaurants and shops. Folding umbrella mandatory.
August is Average for Seoul.
August continues monsoon patterns from July with similar daily storms. By mid-to-late August, monsoon retreats — last 1-2 weeks of August see clearing skies and 'summer-fall transition' weather.
Liberation Day (August 15) commemorates Korean independence from Japan in 1945. Public holiday — government offices closed, public events at Seodaemun Independence Park.
Travel score
Year's hottest month + Liberation Day holiday
August Weather at a Glance
August averages 88°F / 31°C highs and 73°F / 23°C lows — the year's hottest. Peak heat August 5-15, felt temperature up to 100°F+ / 38°C+. Humidity holds at 75%. 12-13 rainy days, 250mm rainfall. Diurnal range begins recovering after ipchu (Aug 7) but real cooling waits for late month.
August Travel Advice
Same as July: cotton/linen + SPF 50 + water bottle + indoor venues. August 15 Liberation Day (Gwangbokjeol) is Korea's biggest national holiday — Busan/Gangwon/Jeju Korean tourist peak. Late August (post-Aug 20) starts cooling.
Flying In from Overseas
Liberation Day week (Aug 13-17) spikes domestic, leaving Seoul quieter. International fares hold at $250-450 round-trip from Tokyo. Late August is the secondary value window.
August Pricing Trends
Liberation Day week hotels modest spike (Gangnam 4-star $140-240/night). Post-Aug 20 returns to $100-170. July-August are the year's #1-2 value windows.
Seoul August Weather Stats
Avg High
31°C
Avg Low
22°C
Rainy Days
14
290mm total
Sunshine
5.5h
Daily avg
Humidity
75%
Very humid
UV Index
9
Very high
Wind
11 km/h
Gusts 20
Crowds
Busy
At attractions
August Sunrise & Sunset
Air Quality
PM2.5
23 μg/m³
PM10
35 μg/m³
Status
Moderate
Feels-Like Temperature & Wind
Feels like
Daytime
36°C
Nighttime
23°C
Humidity and wind affect how the actual temperature feels.
Wind
11 km/h
Max gust 20 km/h
Activities Recommended for August
August Travel Pros & Cons
Pros
- Seoul International Fireworks Festival
- Late-August monsoon ending
- Bingsu summer dessert culture
Cons
- Hot and humid (31-33°C / 88-91°F)
- Heatwaves possible
- Liberation Day closes government services
August Events & Festivals
- Monsoon ends mid-to-late August
- Liberation Day (August 15) — public holiday
- Korean summer school holidays peak
- Seoul International Fireworks Festival (last Saturday of August)
Seoul in August — Full Picture
August continues monsoon patterns from July with similar daily storms. By mid-to-late August, monsoon retreats — last 1-2 weeks of August see clearing skies and 'summer-fall transition' weather.
Liberation Day (August 15) commemorates Korean independence from Japan in 1945. Public holiday — government offices closed, public events at Seodaemun Independence Park.
Seoul International Fireworks Festival (last Saturday of August) at Yeouido Han River Park is one of Asia's largest fireworks displays — 100,000+ shells launched over 60 minutes from barges along the Han River. Free public event; arrive 4-5 hours early at Yeouido Park or Banpo Bridge for prime spots. Genuinely spectacular.
Korean summer school holidays continue. Beach destinations (Sokcho, Jeju) and water parks (Caribbean Bay) at maximum capacity. Within Seoul, Lotte World Theme Park crowded but manageable.
Humidity remains brutal (75%) and afternoon temperatures hit 31-33°C / 88-91°F. Heat exhaustion risk during heatwaves. Korean malls and convenience stores serve as AC refuges. Korean street food reaches peak intensity — bingsu (shaved ice with red beans, fruit, and condensed milk) becomes the iconic Korean summer treat.
Late August begins price softening. Last week of August sees noticeable rate drops as Korean families return from vacation.
What to Wear & What to Pack
Light tropical-style clothing. Quick-dry fabrics. Light cardigan for AC restaurants and shops. Folding umbrella mandatory.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
17.3°C
7°C
8/mo
Summer (Jun·Jul·Aug)
Current29.7°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 August Hotel Picks
Frequently Asked Questions
Is August a good time to visit Seoul?
Seoul in August is Average. Tourist crowds are busy and flight/hotel prices are peak.
What's the average temperature in Seoul in August?
Seoul August averages a high of 31°C and a low of 22°C.
Does it rain much in Seoul in August?
Seoul August averages 290mm of rainfall over about 14 rainy days.
What should I wear in Seoul in August?
Light tropical-style clothing. Quick-dry fabrics. Light cardigan for AC restaurants and shops. Folding umbrella mandatory.
What time are sunrise and sunset in Seoul in August?
Seoul August sunrise is 05:42 and sunset is 19:25, with 13h 43m of daylight.
What's the air quality like in Seoul in August?
Seoul August air quality (AQI) averages 55, rated Moderate. PM2.5 averages 23μg/m³.
What activities are recommended in Seoul in August?
In August, Seoul is great for Seoul International Fireworks Festival, Bingsu street food, Indoor mall culture.
Is August peak season in Seoul?
Seoul August crowds are busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Seoul
View Other Months
Planning a August trip to Seoul?
You've checked the weather — next come the budget and the route.
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.