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
3°
Feels like 3°
Wind↑ S 2 km/h
Humidity 65 %
Afternoon
Clear sky
13°
Feels like 13°
Wind↑ NW 9 km/h
Humidity 54 %
11-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Overcast
10°
Feels like 10°
Wind↑ S 4 km/h
Humidity 76 %
Afternoon
Partly cloudy
16°
Feels like 16°
Wind↑ NNW 10 km/h
Humidity 59 %
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↑ E 1 km/h
Humidity 91 %
Afternoon
Clear sky
17°
Feels like 17°
Wind↑ NNW 7 km/h
Humidity 55 %
13-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Clear sky
10°
Feels like 10°
Wind↑ E 3 km/h
Humidity 86 %
Afternoon
Overcast
17°
Feels like 17°
Wind↑ NNE 3 km/h
Humidity 54 %
Cheonan forecast in charts · next 7 days
The week ahead: highs and lows
▲ This week runs +1.7° warmer than usual
Highs Lows Usual for the season (1991–2020 average)
Hourly detail
Temperature (°C) Rain (mm) Wind (km/h)
Cheonan 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 55% of the annual total; July by itself averages 265 mm.
From 14 h 41 min of daylight in late June to 9 h 38 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
25 mm
Feb
6 °C
−3 °C
32 mm
Mar
11 °C
1 °C
47 mm
Apr
19 °C
7 °C
77 mm
May
24 °C
13 °C
88 mm
Jun
28 °C
18 °C
133 mm
Jul
29 °C
22 °C
265 mm
Aug
30 °C
23 °C
241 mm
Sep
26 °C
17 °C
140 mm
Oct
20 °C
10 °C
58 mm
Nov
13 °C
3 °C
47 mm
Dec
5 °C
−4 °C
28 mm
Whole year
18 °C
8 °C
1,180 mm
Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 36.81° N, 127.15° 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 Cheonan: pollution and pollen
4/6
Poor
European Air Quality Index (EAQI), from Copernicus CAMS
PM2.526µg/m³
PM1027µg/m³
Copernicus CAMS model, updated several times a day.
Rain radar around Cheonan
Rain observed over the last two hours by official weather radars around Cheonan, followed by the radar forecast for the next hour where the weather service provides one.
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Rain radarLast two hours, then forecast where available · drag the timeline
No open weather radar covers Cheonan yet: the map shows our hour-by-hour rain forecast (ICON, GFS).
Moon over Cheonan
Waning gibbous
79 % illuminated · 19.3 days
Rise 15:47 Set 06:25
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 Cheonan
Curious about the weather in Cheonan on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.
Cheonan weather at a glance
This page gathers everything about the weather in Cheonan, Chungcheongnam-do: conditions now, the forecast for each part of the day and the trend for the coming week. At the moment the sky is “overcast”, it is 9 °C (feels like 8 °C) and the wind blows at 8 km/h.
Expected range today: 8 °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.
Use the Cheonan 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.
