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
9°
Feels like 8°
Wind↑ NNE 6 km/h
Humidity 48 %
Afternoon
Overcast
12°
Feels like 12°
Wind↑ SSW 7 km/h
Humidity 58 %
11-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Drizzle
13°
Feels like 13°
Wind↑ WNW 4 km/h
Humidity 73 %
💧 0.3 mm
Afternoon
Partly cloudy
16°
Feels like 16°
Wind↑ W 11 km/h
Humidity 66 %
💧 0.1 mm
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
13°
Feels like 13°
Wind↑ WNW 2 km/h
Humidity 74 %
Afternoon
Clear sky
16°
Feels like 16°
Wind↑ WNW 7 km/h
Humidity 65 %
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
14°
Feels like 14°
Wind↑ ESE 5 km/h
Humidity 73 %
Afternoon
Overcast
17°
Feels like 17°
Wind↑ NNW 8 km/h
Humidity 56 %
Ansan-Si forecast in charts · next 7 days
The week ahead: highs and lows
≈ A week close to the usual temperatures
Highs Lows Usual for the season (1991–2020 average)
Hourly detail
Temperature (°C) Rain (mm) Wind (km/h)
Ansan-Si climate: what a normal year looks like
The hottest stretch is August, when afternoons average 28 °C; the coldest is January, when nights average −5 °C. Between those two months the average temperature changes by 27 °C.
Nights typically freeze from December to February, the coldest averaging −5 °C in January.
The wet season is concentrated from June to August, which brings 55% of the annual total; July by itself averages 299 mm.
From 14 h 44 min of daylight in late June to 9 h 35 min in late December.
Forecast highs for the coming week average 15 °C, 4 °C cooler than a normal October (19 °C).
30-year averages (1991–2020)
Month
Typical high
Typical low
Rainfall
Jan
2 °C
−5 °C
24 mm
Feb
4 °C
−2 °C
30 mm
Mar
8 °C
2 °C
41 mm
Apr
14 °C
7 °C
76 mm
May
20 °C
13 °C
100 mm
Jun
24 °C
18 °C
135 mm
Jul
26 °C
22 °C
299 mm
Aug
28 °C
23 °C
241 mm
Sep
25 °C
18 °C
127 mm
Oct
19 °C
12 °C
59 mm
Nov
12 °C
5 °C
55 mm
Dec
4 °C
−3 °C
29 mm
Whole year
15 °C
9 °C
1,220 mm
Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 37.32° N, 126.82° 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 Ansan-Si: pollution and pollen
4/6
Poor
European Air Quality Index (EAQI), from Copernicus CAMS
PM2.527µg/m³
PM1028µg/m³
Copernicus CAMS model, updated several times a day.
Rain radar around Ansan-Si
Rain observed over the last two hours by official weather radars around Ansan-Si, 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 Ansan-Si yet: the map shows our hour-by-hour rain forecast (ICON, GFS).
Moon over Ansan-Si
Waning gibbous
79 % illuminated · 19.3 days
Rise 15:47 Set 06:28
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 Ansan-Si
Curious about the weather in Ansan-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.
Ansan-Si weather at a glance
This page gathers everything about the weather in Ansan-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 “mainly clear”, it is 12 °C (feels like 12 °C) and the wind blows at 13 km/h.
Expected range today: 11 °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 Ansan-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.
