Cheonan weather in October

In October, Cheonan sees average daytime highs of 20°C and overnight lows near 10°C, with 58 mm of rain across 4.8 wet days and about 11 hours of daylight. It is the 6th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 17°C by the end. The sky is clear or mostly clear about 49% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of October to 10 h 30 min by month's end. Set against the rest of the year, October is Cheonan's 1st-clearest and 10th-windiest month. For the whole year in context, see Cheonan's year-round climate.

Daytime high
20°
6th warmest
Overnight low
10°
7th coldest
Rainfall
58 mm
4.8 wet days
Daylight
11 hours
6:45 AM – 5:48 PM
Cloud cover
45%
1st clearest
Wind
8 km/h
10th windiest
Solar energy
3.73 kWh/m²
Travel score
7.3
out of 10

Cheonan is big city of South Korea.

Density
1,035/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 17°C by the end.

A typical October day in Cheonan reaches about 20°C in the afternoon and slips back to 10°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 24°C. Set against its neighbours, October runs about 6°C cooler than September and about 8°C warmer than November.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12313
22313
32313
42313
52212
62212
72212
82212
92211
102211
112111
122111
132110
142110
152110
162010
17209
18209
19209
20199
21198
22198
23198
24188
25188
26187
27187
28177
29177
30176
31176

How October really feels in Cheonan

Once humidity and wind are folded in, October averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Cheonan weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -5°224.22.29.80.0
Feb / -4°304.31.610.60.5
Mar12° / 476.51.211.73.4
Apr19° / 777.2012.96.4
May24° / 13°897.5013.97.3
Jun28° / 18°1258.6014.56.2
Jul29° / 22°26516.2014.34.5
Aug30° / 22°23715.4013.44.5
Sep26° / 17°1398.6012.26.9
Oct20° / 10°584.80117.3
Nov12° / 456.50.2103.8
Dec / -3°2451.69.50.3

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 49% of the time in October, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 36%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15545
25644
35644
45743
55842
65842
75941
86040
96139
106238
116238
126337
136436
146535
156535
166535
176634
186733
196733
206733
216733
226931
236931
246931
256931
266931
276931
286931
296931
306832
316832

Chance of precipitation in October

Any precipitation

Cheonan gets around 58 mm of rain over 4.8 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 16% and peaks near 19% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
119
218
318
417
517
616
716
815
915
1014
1114
1214
1313
1413
1513
1613
1714
1814
1914
2014
2114
2215
2315
2415
2516
2616
2717
2817
2918
3018
3119

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

Most of October feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, October lands in the dry band about 83% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15231134
25529124
35828113
46027103
5632593
6652483
7692272
8722062
9731962
10771751
11791641
12811441
13831331
14851230
15861130
16881020
1789920
1890820
1992710
2093610
2193610
2294510
2396400
2496400
2597300
2697300
2797300
2898200
2998200
3098200
3198200

Wind in October

Winds average 8 km/h in October.

Across October, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
319calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 36 min at the start of October to 10 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over October. Sunrise moves from 6:32 AM to 7:00 AM, and sunset from 6:09 PM to 5:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:326:09
211.66:326:08
311.56:336:06
411.56:346:05
511.56:356:03
611.46:366:02
711.46:376:00
811.46:385:59
911.36:395:57
1011.36:405:56
1111.26:415:55
1211.26:415:53
1311.26:425:52
1411.16:435:50
1511.16:445:49
1611.06:455:48
1711.06:465:46
1811.06:475:45
1910.96:485:44
2010.96:495:42
2110.96:505:41
2210.86:515:40
2310.86:525:39
2410.76:535:38
2510.76:545:36
2610.76:555:35
2710.66:565:34
2810.66:575:33
2910.66:585:32
3010.56:595:31
3110.57:005:30

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.73 kWh/m².

For context, solar energy here swings from a low near 2.31 kWh/m² to a high of 5.88 kWh/m² in May across the year — October's 3.73 kWh/m² falls in the middle.

012345151015202531
Solar energy (kWh/m²)Level
14.0Bright
24.0Bright
34.0Bright
44.0Bright
54.0Moderate
64.0Moderate
74.0Moderate
84.0Moderate
93.9Moderate
103.9Moderate
113.9Moderate
123.9Moderate
133.8Moderate
143.8Moderate
153.8Moderate
163.8Moderate
173.7Moderate
183.7Moderate
193.7Moderate
203.6Moderate
213.6Moderate
223.6Moderate
233.5Moderate
243.5Moderate
253.5Moderate
263.4Moderate
273.4Moderate
283.3Moderate
293.3Moderate
303.3Moderate
313.2Moderate
Planning a trip in October

Hazard calendar for Cheonan

In seasonPeak

In October, Cheonan sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Cheonan sits in the Pacific typhoon belt; the season peaks July–October.

Cheonan's rainy season runs June–September, when most of the year's rain falls.

Pacific typhoon
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is October a good time to visit Cheonan?

Our two travel scores rate October for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

7.3
Sightseeing
1st-best month of the year
3.9
Beach & pool
6th-best month of the year

October is one of the better times to visit Cheonan for general sightseeing.

What to pack for Cheonan in October

From October's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In October, Cheonan sees daytime highs around 20°C and nights near 10°C. Little to plan around — just the basics. About 5 days see rain.

Sea temperature near Cheonan in October

The nearest coast averages about 20°C in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 59 km away) is warmest in August at about 23°C and coldest in February near 4°C.

It's comfortable for a long swim from Jul 12 to Oct 14 — about 3.1 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan6Bracing
Feb4Bracing
Mar5Bracing
Apr8Bracing
May12Bracing
Jun16Cool
Jul21Refreshing
Aug23Refreshing
Sep23Refreshing
Oct20Cool
Nov15Cool
Dec10Bracing

UV index in Cheonan in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Cheonan peaks around August 13 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateAug 13UV 8Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May6High
Jun7High
Jul8Very high
Aug8Very high
Sep7Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Cheonan in October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.

Air quality in Cheonan 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).

0306090JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyMar 1479 µg/m³Jul 2345 µg/m³
PM2.5 (µg/m³)Level
Jan69Unhealthy
Feb72Unhealthy
Mar80Unhealthy
Apr65Unhealthy
May58Unhealthy
Jun54Poor
Jul45Poor
Aug45Poor
Sep56Unhealthy
Oct67Unhealthy
Nov72Unhealthy
Dec65Unhealthy
Location & terrain

Where is Cheonan?

Cheonan sits at 36.8°N, 127.2°E, 40 m above sea level, in South Korea. The nearest listed city is Seonghwan, 12 km away.

Cheongju-si

Topography around Cheonan

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Cheonan.

Within 3 km, the terrain around Cheonan has significant variations in elevation — a maximum elevation change of 287 m around an average of 67 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 602 m; within 80 km, large variations in elevation — a maximum elevation change of 1,032 m.

The land around Cheonan is covered by artificial surfaces (64%) and trees (26%) within 3 km, trees (51%), cropland (23%) and artificial surfaces (20%) within 16 km, and trees (55%) and cropland (22%) within 80 km.

3 km
287 m
16 km
602 m
80 km
1,032 m
treesgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: Seonghwan 12 km · Asan 13 km · Pyeongtaek 22 km · Anseong 25 km · Chinch'ŏn 27 km · Sejong 27 km · Yesan 31 km · Cheongju-si 35 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
none 60%Protestant 17%Buddhist 16%Catholic 6%

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 Cheonan (36.8065°, 127.1522°, elevation 40 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).