Seongnam-si, Gyeonggi-do, South Korea climate
Average temperatures, precipitation and all-time records for Seongnam-si, Gyeonggi-do, South Korea, with every day graded against ~45 years of local climate history (1981–2026). Its warmest month is August, averaging a high of 29°C, and its coldest is January, with an average low of -7°C.
Seongnam is the fourth largest city in South Korea's Gyeonggi Province after Suwon and the 10th largest city in the country. Its population is approximately one million. It consists of three administrative districts: Bundang District, Jungwon District, and Sujeong District. via Wikipedia
How today compares
Latest recorded day: 2026-07-21. Each reading placed on Seongnam-si, Gyeonggi-do, South Korea's own ±7-day seasonal distribution.
Seongnam-si average temperatures by month
Typical daily high and low, and average precipitation, for each month in Seongnam-si, Gyeonggi-do, South Korea, based on 1981–2026 records. The wettest month is July (13 mm on an average day).
| Month | Avg high | Avg low | Avg precip |
|---|---|---|---|
| January | 0°C | -7°C | 0 mm |
| February | 3°C | -5°C | 0 mm |
| March | 9°C | -1°C | 0 mm |
| April | 16°C | 5°C | 3 mm |
| May | 21°C | 10°C | 3 mm |
| June | 25°C | 16°C | 3 mm |
| July | 27°C | 21°C | 13 mm |
| August | 29°C | 22°C | 8 mm |
| September | 24°C | 17°C | 5 mm |
| October | 19°C | 10°C | 3 mm |
| November | 11°C | 3°C | 3 mm |
| December | 3°C | -4°C | 0 mm |
Each bar spans the 10th-percentile daily low to the 90th-percentile daily high (the range most days fall within), coloured cold → hot on a shared -23°C to 46°C scale, so the whole year's rhythm reads at a glance.
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Record extremes
- Hottest day on record: 35°C on 2018-08-01
- Coldest day on record: -21°C on 2001-01-15
Percentiles compare each day to Seongnam-si, Gyeonggi-do, South Korea's own history, so grades are relative to this location: a “Near Record” day here isn't the same temperature as elsewhere. How the grades work →