yearsofweather

Seoul in August:
properly hot,

Seoul, South Korea · Records from 2006 to 2025. Not a forecast.

Mean high30°Hottest day 38.5° (2018)
Mean low23°Coldest night 13.5° (2022)
Rain days11 days4-20 by year
Rainfall324mmDaylight 14.1 → 13.1 h
Seoul's 12 months iBest: May and September
Trip types Sightseeing on foot Finehot, muggy and storm risk
Humidity81%27 muggy days
Clear days4 days12 overcast days
Mean wind8 km/hRarely windy
Sunrise / sunset (15th)05:48 / 19:26Daylight 14.1 → 13.1 h

Seoul in August

The peak of the heat. Showers and cloudbursts stay frequent after the rainy season, and on the night of August 8, 2022, a downpour flooded roads around Gangnam Station. August is also when typhoons most often reach the Korean Peninsula. Spend the day in museums or underground malls and save Han River walks for after dark.

It was a hot month: 30°C by day and 23°C after dark. With 11 rain days on average, a wet day was rarely more than a few days away. A visitor in 2015 met 4 rain days; one in 2007 met 20. The average of 11 hid that gap.

With 17 days above 30°C on average, most of the month felt like high summer. The warmest year was 2024, with highs averaging 32.5°C, 2.4°C above normal. Rain days averaged 28 mm each, so when it rained it rained properly.

How long it rained

On a rainy day it rained for about 6.7 hours. Rain came at any time of day.

Typhoons i

6 of the last 20 years had a tropical storm pass within 300 km this month.

  • Soulik (2018), 147 km away tropical storm
  • Francisco (2019), 190 km away tropical storm
  • Bavi (2020), 200 km away typhoon strength
1 2 3 4 5 6 37 68 59 210 11 12

Date by date i

‹ July August 2027 September ›
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
1-7rain on 38% of days32° 25°
8-14rain on 38% of days31° 24°
15-21rain on 32% of days30° 23°
22-28rain on 38% of days29° 22°
29-31rain on 42% of days28° 20°

0-5/206-8/209-11/2012-20/20

1-7rain on 38% of days32° 25°
8-14rain on 38% of days31° 24°
15-21rain on 32% of days30° 23°
22-28rain on 38% of days29° 22°
29-31rain on 42% of days28° 20°
Tap another date to change

20066mm
200771mm
2008none
2009none
2010137mm
2011none
20126mm
201349mm
20148mm
2015none
2016none
2017none
201822mm
20195mm
202015mm
20211mm
20223mm
202323mm
2024none
20255mm
Holidays in August (2027)
  • August 14 to August 16 Liberation Day long weekend
  • August 16 Substitute holiday (Liberation Day)

1 Local public holiday or break (busier, pricier)

Day by day temperature i

18°25°33°40° 1815222931

Mean high Mean low Coldest to warmest high in 20 years

Your trip dates, the past 20 years

Trip dates ~

You can also click two dates on the axis. Hover a cell to see that day's rain.
Trip rain days Month rain days
2006
0 d 7 d
2007
7 d 20 d
2008
2 d 13 d
2009
1 d 6 d
2010
2 d 15 d
2011
5 d 13 d
2012
0 d 15 d
2013
5 d 11 d
2014
4 d 11 d
2015
2 d 4 d
2016
0 d 4 d
2017
2 d 15 d
2018
0 d 10 d
2019
4 d 9 d
2020
7 d 19 d
2021
2 d 11 d
2022
4 d 18 d
2023
0 d 9 d
2024
3 d 8 d
2025
3 d 11 d
Years with rain
Tap a date to start, tap another to end. Each cell is that date in one year.
'06'07'08'09'10'11'12'13'14'15'16'17'18'19'20'21'22'23'24'25
of 20
8
9
9
7
4
9
7
5
5
8
9
8
7
11
10
3
8
6
5
6
7
9
8
6
8
8
7
7
13
7
5
Rain days on trip
07212505420204724033

No rain1-9 mm10 mm or more Dates outside your trip are dimmed.

One row per year, one cell per day. 2015 had 4 rain days, 2007 had 20.

Seoul through the year

MonthHighLowRain daysRainfall
January 2°−5°3 days14mm
February 5°−3°3 days25mm
March 12°2°5 days42mm
April 18°9°7 days74mm
MayGood 23°14°7 days105mm
June 28°19°7 days118mm
July 30°23°14 days433mm
August 30°23°11 days324mm
SeptemberGood 27°18°7 days146mm
October 20°11°6 days58mm
November 12°4°6 days50mm
December 4°−3°5 days24mm

Common questions

Does it rain a lot in Seoul in August?

Over the past 20 years August averaged 11 rain days (1 mm or more) out of 31. Individual years ran from 4 in the driest to 20 in the wettest.

What should I wear in Seoul in August?

Days averaged 30°C and nights 23°C. Pack a compact umbrella, T-shirts, sunscreen plus a hat, and insect repellent.

Is August a good time to visit Seoul?

On warmth and rain days alone, Seoul's easiest months were May and September. August ranked 6 of 12.

Is Seoul humid in August?

Mean relative humidity was 81%, with about 27 muggy days (dew point of 20°C or more) in the month.