Sejong in Spring
In spring (March, April and May), Sejong sees average daytime highs around 18°C and overnight lows near 7°C, with 213 mm of precipitation over about 22 wet days across the season. It is the 3rd-warmest season and the 3rd-wettest season.
Over the season highs climb from about 9°C in early March to 26°C by late May. The sky is clear or mostly clear about 41% of the time across spring, and the air most often feels dry.
Spring is Sejong's 2nd-best season to visit on our travel score. For the whole year in context, see Sejong's year-round climate.
- Avg daytime high
- 18°C
- 3rd-warmest season
- Avg overnight low
- 7°C
- Precipitation
- 213 mm
- 22 wet days
- Avg wind
- 10 km/h
- Travel score
- 5.8
- 2nd-best season
- Months
- Mar · Apr · May
Temperature in Sejong in Spring
Over the season highs climb from about 9°C in early March to 26°C by late May.
A typical spring day in Sejong reaches about 18°C and drops to 7°C overnight. The warmest of the three months is May, the coolest March.
How spring really feels in Sejong
Once humidity and wind are folded in, spring brings about 0 days that feel above 32°C and 25 that feel at or below 0°C.
The story in spring is cold — wind chill drags the overnight "feels like" below the raw low.
Sejong weather by month
How the three spring months (March, April and May) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 4° / -5° | 22 | 4.3 | 2.2 | 9.8 | 0.0 |
| Feb | 6° / -3° | 30 | 4.3 | 1.5 | 10.6 | 0.7 |
| Mar | 12° / 1° | 49 | 6.7 | 1.1 | 11.7 | 3.6 |
| Apr | 19° / 7° | 79 | 7.4 | 0 | 12.9 | 6.5 |
| May | 24° / 13° | 86 | 7.5 | 0 | 13.9 | 7.2 |
| Jun | 28° / 18° | 122 | 8.5 | 0 | 14.5 | 6.1 |
| Jul | 29° / 22° | 256 | 16.1 | 0 | 14.2 | 4.5 |
| Aug | 30° / 22° | 226 | 15 | 0 | 13.4 | 4.4 |
| Sep | 26° / 17° | 143 | 8.5 | 0 | 12.2 | 6.8 |
| Oct | 20° / 10° | 58 | 4.8 | 0 | 11.1 | 7.4 |
| Nov | 13° / 3° | 43 | 5.9 | 0.2 | 10 | 4.0 |
| Dec | 6° / -3° | 23 | 4.5 | 1.4 | 9.5 | 0.5 |
Cloud cover in Spring
The sky is clear or mostly clear about 41% of the time across spring.
Chance of precipitation in Spring
Sejong gets around 213 mm of rain and snow over 22 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 10 km/h across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 06 min in early March to 14 h 18 min by late May. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 5.4 kWh/m².
Hazard calendar for Sejong
None of Sejong's seasonal hazards peak in spring. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do.
Sejong's rainy season runs June–September, when most of the year's rain falls.
Is spring a good time to visit Sejong?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is a reasonable time to visit Sejong for sightseeing.
What to pack for Sejong in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, Sejong sees daytime highs around 18°C and nights near 7°C. Worth packing: light clothes, a warm layer and sun protection. About 22 days see rain.
UV index in Sejong in Spring
Clear-sky midday UV across spring averages around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Sejong peaks around August 14 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 7 | 7 | 8 | 8 | 8 | 5 | 3 | 2 |
| Level | Moderate | Moderate | Moderate | High | High | Very high | Very high | Very high | Very high | High | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 7 | High |
| Jun | 7 | Very high |
| Jul | 8 | Very high |
| Aug | 8 | Very high |
| Sep | 8 | Very high |
| Oct | 5 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Sejong in Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring falls, not just the annual average.
Air quality in Sejong is worst in March — around 80 µg/m³ PM2.5 (unhealthy), about 1.8× the cleanest month (July, 45 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 69 | 72 | 80 | 65 | 58 | 54 | 45 | 45 | 56 | 67 | 72 | 65 |
| Level | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Poor | Poor | Poor | Unhealthy | Unhealthy | Unhealthy | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 69 | Unhealthy |
| Feb | 72 | Unhealthy |
| Mar | 80 | Unhealthy |
| Apr | 65 | Unhealthy |
| May | 58 | Unhealthy |
| Jun | 54 | Poor |
| Jul | 45 | Poor |
| Aug | 45 | Poor |
| Sep | 56 | Unhealthy |
| Oct | 67 | Unhealthy |
| Nov | 72 | Unhealthy |
| Dec | 65 | Unhealthy |
Where is Sejong?
Sejong sits at 36.6°N, 127.3°E, 49 m above sea level, in South Korea. The nearest listed city is Cheongju-si, 18 km away.
Topography around Sejong
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sejong.
Within 3 km, the terrain around Sejong has only modest variations in elevation — a maximum elevation change of 148 m around an average of 39 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 445 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,213 m.
The land around Sejong is covered by cropland (43%), artificial surfaces (28%) and trees (21%) within 3 km, trees (54%) and cropland (22%) within 16 km, and trees (62%) and cropland (23%) within 80 km.
South Korea travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / F
- 220 V · 60 Hz
- Prices
- ≈ 57% of US
- price level, 2025
- GDP per capita
- $36,227
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.5
- per 100k, 2023
- Road deaths
- 8.6
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 522
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Sejong (36.5924°, 127.2922°, elevation 49 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.