10-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Clear sky
4°
Feels like 4°
Wind↑ E 3 km/h
Humidity 43 %
Afternoon
Clear sky
11°
Feels like 11°
Wind↑ W 4 km/h
Humidity 45 %
11-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Mainly clear
7°
Feels like 7°
Wind↑ ESE 3 km/h
Humidity 84 %
Afternoon
Partly cloudy
14°
Feels like 14°
Wind↑ WSW 4 km/h
Humidity 64 %
12-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Partly cloudy
9°
Feels like 9°
Wind↑ NE 1 km/h
Humidity 92 %
Afternoon
Clear sky
16°
Feels like 16°
Wind↑ NW 5 km/h
Humidity 56 %
13-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Mainly clear
10°
Feels like 10°
Wind↑ E 3 km/h
Humidity 84 %
Afternoon
Overcast
17°
Feels like 17°
Wind↑ N 4 km/h
Humidity 49 %
Seongnam-Si forecast in charts · next 7 days
The week ahead: highs and lows
▲ This week runs +1.9° warmer than usual
Highs Lows Usual for the season (1991–2020 average)
Hourly detail
Temperature (°C) Rain (mm) Wind (km/h)
Seongnam-Si climate: what a normal year looks like
The hottest stretch is August, when afternoons average 29 °C; the coldest is January, when nights average −7 °C. Between those two months the average temperature changes by 29 °C.
Nights typically freeze from December to February, the coldest averaging −7 °C in January.
The wet season is concentrated from June to August, which brings 58% of the annual total; July by itself averages 323 mm.
From 14 h 44 min of daylight in late June to 9 h 34 min in late December.
Forecast highs for the coming week average 15 °C, 5 °C cooler than a normal October (20 °C).
30-year averages (1991–2020)
Month
Typical high
Typical low
Rainfall
Jan
2 °C
−7 °C
23 mm
Feb
5 °C
−4 °C
30 mm
Mar
10 °C
0 °C
42 mm
Apr
18 °C
6 °C
77 mm
May
23 °C
12 °C
101 mm
Jun
27 °C
18 °C
140 mm
Jul
28 °C
22 °C
324 mm
Aug
29 °C
22 °C
265 mm
Sep
26 °C
16 °C
131 mm
Oct
20 °C
9 °C
57 mm
Nov
12 °C
2 °C
50 mm
Dec
4 °C
−5 °C
27 mm
Whole year
17 °C
8 °C
1,270 mm
Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 37.44° N, 127.14° 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 Seongnam-Si: pollution and pollen
4/6
Poor
European Air Quality Index (EAQI), from Copernicus CAMS
PM2.533µg/m³
PM1035µg/m³
Copernicus CAMS model, updated several times a day.
Rain radar around Seongnam-Si
Rain observed over the last two hours by official weather radars around Seongnam-Si, followed by the radar forecast for the next hour where the weather service provides one.
--:--
Rain radarLast two hours, then forecast where available · drag the timeline
No open weather radar covers Seongnam-Si yet: the map shows our hour-by-hour rain forecast (ICON, GFS).
Moon over Seongnam-Si
Waning gibbous
79 % illuminated · 19.3 days
Rise 15:45 Set 06:27
Sat31/1069%
Sun1/1159%
Mon2/1149%Last quarter
Tue3/1138%
Wed4/1128%
Thu5/1119%
Fri6/1112%
Sat7/116%
Sun8/112%
Mon9/110%
Tue10/111%New moon
Wed11/113%
Moonrise and moonset in local time (Asia/Seoul); phase and lit fraction from a synodic calculation.
Look up a past day in Seongnam-Si
Curious about the weather in Seongnam-Si on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.
Seongnam-Si weather at a glance
This page gathers everything about the weather in Seongnam-Si, Gyeonggi-do: conditions now, the forecast for each part of the day and the trend for the coming week. At the moment the sky is “partly cloudy”, it is 10 °C (feels like 10 °C) and the wind blows at 6 km/h.
Expected range today: 9 °C to 18 °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.
Use the Seongnam-Si 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.
