Climate averages 1991–2020
Seosan weather
in July.
A warm, very wet month: the 2nd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a warm month in Seosan: daytime highs average 27.0°C and nights cool to about 21.9°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 245 mm of rain on roughly 15 days, which makes July a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 25 min on an average July day.
The nearest other city in this atlas is Hongseong (28 km away). In July its highs average 28.4°C, 1.4°C warmer than Seosan, with 263 mm of rain.
Among the 79 cities listed in South Korea, Seosan ranks 64th of 79 for the warmest July highs and 30th of 79 for the driest July (rainfall, lowest first). The mean July high of those 79 cities is 27.8°C; Seosan is 0.8°C cooler than that mean.
From July to August, average highs rise by 0.9°C to 27.9°C, and monthly rainfall falls from 245 mm to 225 mm.
The annual picture
July in context
Monthly rainfall
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
Seosan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.5°C-2.8°C | -2.8°C | 22 | 4.8 | 9.910 h |
| February | 4.4°C-1.9°C | -1.9°C | 28 | 4.3 | 10.811 h |
| March | 9.0°C1.7°C | 1.7°C | 41 | 5.6 | 11.912 h |
| April | 15.1°C6.8°C | 6.8°C | 69 | 6.8 | 13.113 h |
| May | 20.3°C12.2°C | 12.2°C | 79 | 7.0 | 14.114 h |
| June | 24.6°C17.3°C | 17.3°C | 116 | 7.7 | 14.615 h |
| July, selected | 27.0°C21.9°C | 21.9°C | 245 | 14.8 | 14.414 h |
| August | 27.9°C22.9°C | 22.9°C | 225 | 13.7 | 13.614 h |
| September | 24.2°C18.4°C | 18.4°C | 133 | 7.5 | 12.512 h |
| October | 18.6°C12.3°C | 12.3°C | 55 | 5.3 | 11.311 h |
| November | 11.7°C5.7°C | 5.7°C | 49 | 7.2 | 10.210 h |
| December | 5.0°C-0.5°C | -0.5°C | 26 | 6.1 | 9.710 h |
Rainfall is the average of the 30 separate monthly totals. A rain 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
July in nearby cities
- Hongseong in JulySouth Korea · 28 kmHigh 28.4°C · Low 22.0°C · 263 mm rain
- Asan in JulySouth Korea · 49 kmHigh 28.7°C · Low 21.8°C · 250 mm rain
- Boryeong in JulySouth Korea · 50 kmHigh 27.2°C · Low 22.5°C · 263 mm rain
- Hwaseong-si in JulySouth Korea · 57 kmHigh 26.2°C · Low 21.6°C · 298 mm rain
- Pyeongtaek in JulySouth Korea · 61 kmHigh 28.5°C · Low 21.7°C · 260 mm rain
- Cheonan in JulySouth Korea · 62 kmHigh 29.0°C · Low 21.9°C · 265 mm rain
- Ansan-si in JulySouth Korea · 69 kmHigh 27.1°C · Low 21.6°C · 298 mm rain
- Osan in JulySouth Korea · 69 kmHigh 28.2°C · Low 21.6°C · 279 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 Seosan) is explained once on the Seosan year overview and on the Sources, method and limits page.