Seoul weather in August
In August, Seoul has an average high of 28 °C83 °F and an average low of 22 °C71 °F, with about 260 mm10 in of precipitation. August is the warmest month of the year and ranks 2nd for precipitation.
How August compares with other months
Compared with July, August is 0.9 °C1.6 °F warmer on average and drier by 100 mm3.9 in. Compared with September, August is 4.5 °C8.2 °F warmer on average and wetter by 123 mm4.8 in. Daylight lasts about 13.6 hours around the middle of the month. Average relative humidity is 83% and the average cloud amount 65%.
Is August a good time to visit Seoul?
August is not among the most comfortable months by our comfort score: it is hot (average high 28 °C83 °F), it is fairly wet (260 mm10 in) and it is humid (83%). The most comfortable months in Seoul are May and October.
What to wear in August
For Seoul in August, pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
August in nearby places
Other months in Seoul
- January1 °C33 °F / −7 °C20 °F
- February3 °C38 °F / −5 °C23 °F
- March9 °C48 °F / −1 °C30 °F
- April15 °C60 °F / 5 °C40 °F
- May21 °C70 °F / 11 °C52 °F
- June26 °C78 °F / 17 °C62 °F
- July28 °C82 °F / 21 °C70 °F
- August28 °C83 °F / 22 °C71 °F
- September25 °C76 °F / 17 °C62 °F
- October19 °C65 °F / 10 °C49 °F
- November11 °C51 °F / 3 °C37 °F
- December3 °C37 °F / −4 °C24 °F
Frequently asked questions
How warm is Seoul in August?
In August the average high in Seoul is 28 °C (83 °F) and the average low is 22 °C (71 °F).
Does it rain a lot in Seoul in August?
On average about 260 mm (10.2 in) of precipitation falls in August; it ranks 2nd of the 12 months.
Is August the warmest month in Seoul?
Yes. August is the warmest month in Seoul. The coldest month is January, with an average low of -7 °C (20 °F).
How long is the day in Seoul in August?
In the middle of August the day in Seoul lasts about 13.6 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Seoul in August?
The average relative humidity in August is about 83%. Combined with warm days, it can feel muggy.
How cloudy is Seoul in August?
On average about 65% of the sky is covered by cloud in August. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.