Climate averages 1991–2020
Seoul weather
in August.
A hot, very wet month: the warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Seoul: daytime highs average 28.6°C and nights cool to about 22.0°C. By daytime temperature it is the warmest month of the year.
Expect about 258 mm of rain on roughly 15 days, which makes August a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 37 min on an average August day.
The nearest other city in this atlas is Gwangmyeong (14 km away). In August its highs average 28.4°C, about as warm as Seoul, with 244 mm of rain.
Among the 79 cities listed in South Korea, Seoul ranks joint 44th of 79 for the warmest August highs and joint 63rd of 79 for the driest August (rainfall, lowest first). The mean August high of those 79 cities is 28.6°C; Seoul is level with that mean.
From August to September, average highs fall by 3.9°C to 24.7°C, and monthly rainfall falls from 258 mm to 124 mm.
The annual picture
August in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Seoul climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.6°C-6.9°C | -6.9°C | 19 | 3.5 | 9.910 h |
| February | 4.6°C-4.8°C | -4.8°C | 26 | 4.1 | 10.811 h |
| March | 10.0°C-0.5°C | -0.5°C | 38 | 6.2 | 11.912 h |
| April | 16.6°C5.4°C | 5.4°C | 70 | 7.3 | 13.113 h |
| May | 22.0°C11.4°C | 11.4°C | 96 | 7.7 | 14.214 h |
| June | 26.3°C17.1°C | 17.1°C | 126 | 8.8 | 14.715 h |
| July | 27.9°C21.4°C | 21.4°C | 314 | 16.5 | 14.514 h |
| August, selected | 28.6°C22.0°C | 22.0°C | 258 | 15.1 | 13.614 h |
| September | 24.7°C16.4°C | 16.4°C | 124 | 7.6 | 12.512 h |
| October | 18.6°C9.0°C | 9.0°C | 55 | 5.3 | 11.311 h |
| November | 10.7°C1.8°C | 1.8°C | 47 | 7.1 | 10.210 h |
| December | 3.5°C-4.7°C | -4.7°C | 23 | 4.8 | 9.610 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Gwangmyeong in AugustSouth Korea · 14 kmHigh 28.4°C · Low 22.3°C · 244 mm rain
- Guri-si in AugustSouth Korea · 15 kmHigh 28.7°C · Low 22.0°C · 277 mm rain
- Goyang-si in AugustSouth Korea · 16 kmHigh 28.3°C · Low 22.1°C · 264 mm rain
- Bucheon-si in AugustSouth Korea · 19 kmHigh 28.0°C · Low 22.5°C · 244 mm rain
- Anyang-si in AugustSouth Korea · 20 kmHigh 28.0°C · Low 22.3°C · 258 mm rain
- Seongnam-si in AugustSouth Korea · 20 kmHigh 28.4°C · Low 21.9°C · 277 mm rain
- Hanam in AugustSouth Korea · 20 kmHigh 28.8°C · Low 22.0°C · 277 mm rain
- Uijeongbu-si in AugustSouth Korea · 20 kmHigh 28.4°C · Low 21.9°C · 265 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Seoul) is explained once on the Seoul year overview and on the Sources, method and limits page.
Anyang-si lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.