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Weather & Climate in Sejong, South Korea
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Sejong experiences four distinct seasons with an average annual temperature of 53°F (11°C). Winters average 26°F in January while summers reach 76°F in July. The area gets 245 sunny days per year, above the national average. Annual precipitation totals 50.2 inches (wetter than the 38-inch national average). The area receives 3.6 inches of snow annually. The city sits at an elevation of 161 feet.
Temperature
26°F Jan (-3°C)
76°F Jul (25°C)
| Annual Average | 52.6°F |
| 3% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 76°F (25°C) |
| Sunny Days | 245 days/yr |
Geography
| Elevation | 161 ft (49 m) |
| Area | 7.0 sq mi (18.2 km²) |
| Population Density | 56,135/sq mi |
| Coordinates | 36.5925°N, 127.2922°W |
| Timezone | Asia/Seoul |
Precipitation & Snow
Air Quality
Earthquake History
3 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.
| Dec 13, 1996 | 20 km W of T’aebaek, South Korea | M4.8 | 144 km | 10 km |
| Jun 11, 2024 | 3 km NW of Puan, South Korea | M4.4 | 107 km | 10 km |
| Jan 29, 2020 | 21 km WNW of Mungyeong, South Korea | M3.5 | 63 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
20 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 2022 | Hinnamnor | Category 1 | 81 mph | 231 km |
| 2020 | Bavi | Category 2 | 92 mph | 227 km |
| 2020 | Haishen | Category 1 | 92 mph | 167 km |
| 2020 | Maysak | Category 1 | 92 mph | 187 km |
| 2019 | Lingling | Category 2 | 75 mph | 215 km |
| 2016 | Chaba | Category 1 | 75 mph | 255 km |
| 2012 | Sanba | Category 2 | 86 mph | 185 km |
| 2010 | Kompasu | Category 2 | 81 mph | 132 km |
| 2007 | Nari | Category 1 | 75 mph | 233 km |
| 2003 | Maemi | Category 2 | 86 mph | 171 km |
| 2003 | Soudelor | Category 1 | 69 mph | 287 km |
| 2002 | Rusa | Category 1 | 81 mph | 266 km |
| 2000 | Saomai | Category 1 | 69 mph | 297 km |
| 2000 | Prapiroon | Category 1 | 81 mph | 210 km |
| 1999 | Olga | Category 1 | 63 mph | 194 km |
| 1995 | Faye | Category 2 | 75 mph | 112 km |
| 1991 | Caitlin | Category 1 | 81 mph | 280 km |
| 1987 | Dinah | Category 1 | 98 mph | 267 km |
| 1987 | Thelma | Category 1 | 86 mph | 266 km |
| 1985 | Kit | Category 1 | 52 mph | 267 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
1 tsunami recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1700 | YELLOW SEA | Earthquake | — | — | 72 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
1 volcano within 200 km. Closest: Ch'uga-ryong (193 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Ch'uga-ryong | Shield | 452 m (1,483 ft) | Unknown | 193 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 1.1 in | Coldest, Driest |
| February | 30°F (-1°C) | 1.3 in | |
| March | 40°F (5°C) | 2.1 in | |
| April | 53°F (12°C) | 3.4 in | |
| May | 62°F (17°C) | 3.6 in | |
| June | 70°F (21°C) | 5.7 in | |
| July | 76°F (25°C) | 11.7 in | Wettest |
| August | 77°F (25°C) | 10.4 in | Warmest |
| September | 67°F (20°C) | 5.8 in | |
| October | 55°F (13°C) | 2.0 in | |
| November | 43°F (6°C) | 2.0 in | |
| December | 31°F (-0°C) | 1.2 in |
Sejong has a seasonal temperature swing of 50°F / from 26°F in January to 77°F in August. Total annual precipitation is 50.2 inches, with July being the wettest month (11.7") and January the driest (1.1").