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Sejong weather

Sejong-si · 394,630 inhabitants · Friday, October 30 · updated 08:09

Air: Moderate

9°

Drizzle

Feels like 9°C

Wind

4 km/h

Gusts

4 km/h

Humidity

85 %

Pressure

1018 hPa

Clouds

71 %

Storm

Rise 06:51 Set 17:37 Day 10 h 45 min UV 4 · Moderate

Morning, afternoon, evening

Trend

Morning

Clear sky

11°8°

Feels like 11°

Wind ↑ SSE 4 km/h

Humidity 86 %

Afternoon

Partly cloudy

20°17°

Feels like 20°

Wind ↑ W 14 km/h

Gusts 21 km/h

Humidity 48 %

💧 0.1 mm

Evening

Clear sky

13°12°

Feels like 13°

Wind ↑ WSW 8 km/h

Gusts 19 km/h

Humidity 65 %

09:00

11°

SSE 4

12:00

17°

W 10

15:00

20°

0.1mm

W 14

18:00

13°

WSW 8

21:00

12°

SSW 8

00:00

10°

SSW 9

03:00

12°

0.1mm

SW 9

06:00

10°

SW 9

Sejong forecast in charts · next 7 days

The week ahead: highs and lows

▲ This week runs +1.6° warmer than usual

Highs Lows Usual for the season (1991–2020 average)

Hourly detail

Temperature (°C) Rain (mm) Wind (km/h)

Sejong climate: what a normal year looks like

The hottest stretch is August, when afternoons average 30 °C; the coldest is January, when nights average −6 °C. Between those two months the average temperature changes by 28 °C.

Nights typically freeze from December to February, the coldest averaging −6 °C in January.

The wet season is concentrated from July to September, which brings 54% of the annual total; July by itself averages 261 mm.

From 14 h 39 min of daylight in late June to 9 h 39 min in late December.

Forecast highs for the coming week average 17 °C, 3 °C cooler than a normal October (20 °C).

30-year averages (1991–2020)
Month	Typical high	Typical low	Rainfall
Jan	3 °C	−6 °C	26 mm
Feb	6 °C	−3 °C	33 mm
Mar	11 °C	1 °C	50 mm
Apr	19 °C	7 °C	80 mm
May	24 °C	13 °C	89 mm
Jun	28 °C	18 °C	132 mm
Jul	29 °C	22 °C	261 mm
Aug	30 °C	23 °C	231 mm
Sep	26 °C	17 °C	144 mm
Oct	20 °C	10 °C	59 mm
Nov	13 °C	3 °C	45 mm
Dec	5 °C	−4 °C	27 mm
Whole year	18 °C	8 °C	1,180 mm

Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 36.59° N, 127.29° E, 1991–2020. ERA5 averages over a 0.25° grid (about 25 km): hills, a coastline or the heat of the city itself can shift local values by a degree or two.

Air you breathe in Sejong: pollution and pollen

3/6

Moderate

European Air Quality Index (EAQI), from Copernicus CAMS

PM2.524µg/m³

PM1025µg/m³

Copernicus CAMS model, updated several times a day.

Rain radar around Sejong

Rain observed over the last two hours by official weather radars around Sejong, followed by the radar forecast for the next hour where the weather service provides one.

Full-screen rain radar and next-hour rain on RainAtlas

Rain radar Last two hours, then forecast where available · drag the timeline

No open weather radar covers Sejong yet: the map shows our hour-by-hour rain forecast (ICON, GFS).

Moon over Sejong

Waning gibbous

79 % illuminated · 19.3 days

Rise 15:47 Set 06:23

Sat 31/10 69%

Sun 1/11 59%

Mon 2/11 49% Last quarter

Tue 3/11 38%

Wed 4/11 28%

Thu 5/11 19%

Fri 6/11 12%

Sat 7/11 6%

Sun 8/11 2%

Mon 9/11 0%

Tue 10/11 1% New moon

Wed 11/11 3%

Moonrise and moonset in local time (Asia/Seoul); phase and lit fraction from a synodic calculation.

Look up a past day in Sejong

Curious about the weather in Sejong on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.

Sejong weather at a glance

This page gathers everything about the weather in Sejong, Sejong-si: conditions now, the forecast for each part of the day and the trend for the coming week. At the moment the sky is “drizzle”, it is 9 °C (feels like 9 °C) and the wind blows at 4 km/h.

Expected range today: 10 °C to 20 °C and a dry sky. The forecast comes from the AtmoAtlas engine, which combines ECMWF-AIFS, NOAA GFS and DWD ICON, adjusts cloud cover with METAR reports and uses convective energy (CAPE) to flag storms.

Other big cities nearby

Hwaseong-Si 80 km 11°

Suwon 82 km 10°

Jeonju 87 km 10°

Sejong weather data for developers

Use the Sejong forecast in your own website or app: one JSON call returns weather, air quality, tides and sun and moon times. The free key needs no card.

Create a free key

Where does this forecast come from? Our engine, checked every day against 1125 weather stations