Seongnam-si weather in October

In October, Seongnam-si sees average daytime highs of 19°C and overnight lows near 9°C, with 58 mm of rain across 5.5 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 22°C in the first days to 16°C by the end. The sky is clear or mostly clear about 51% 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 Seongnam-si's 2nd-clearest and 9th-windiest month. For the whole year in context, see Seongnam-si's year-round climate.

Daytime high
19°
6th warmest
Overnight low
7th coldest
Rainfall
58 mm
5.5 wet days
Daylight
11 hours
6:46 AM – 5:47 PM
Cloud cover
44%
2nd clearest
Wind
7 km/h
9th windiest
Solar energy
3.67 kWh/m²
Travel score
7.0
out of 10

Seongnam-si is human settlement in South Korea.

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 22°C in the first days to 16°C by the end.

A typical October day in Seongnam-si reaches about 19°C in the afternoon and slips back to 9°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 23°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)
12312
22212
32212
42212
52211
62211
72111
82111
92110
102110
112110
122010
13209
14209
15209
16209
17198
18198
19198
20198
21187
22187
23187
24187
25176
26176
27176
28176
29166
30165
31165

How October really feels in Seongnam-si

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.

Seongnam-si 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 / -7°213.82.69.70.0
Feb / -5°284.2210.60.3
Mar11° / -0°436.41.611.72.8
Apr17° / 797.30.112.95.9
May23° / 12°1048.50147.1
Jun26° / 17°1359.3014.56.5
Jul28° / 21°34017.2014.34.8
Aug29° / 22°27715.7013.44.8
Sep25° / 16°1348.4012.36.9
Oct19° / 585.50117.0
Nov11° / 507.30.7103.1
Dec / -5°254.72.19.50.1

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 51% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 34%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25842
35842
45941
56040
66139
76139
86238
96337
106436
116535
126634
136634
146733
156733
166733
176832
186832
196931
206931
217030
227030
237030
247129
257129
267228
277129
287228
297129
307129
317129

Chance of precipitation in October

Any precipitation

Seongnam-si gets around 58 mm of rain over 5.5 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 17% and peaks near 20% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
120
220
319
419
519
619
719
818
918
1018
1117
1217
1317
1417
1516
1616
1716
1816
1916
2016
2116
2216
2316
2416
2517
2617
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 85% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15431123
25730112
36028102
4622792
5662581
6682471
7712261
8732061
9751951
10791740
11811540
12831430
13851230
14871120
15881020
1690820
1792710
1893610
1994510
2095410
2196400
2297300
2397300
2498200
2598200
2698200
2799100
2899100
2999100
3099100
3199100

Wind in October

Winds average 7 km/h in October.

Across October, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

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 7:01 AM, and sunset from 6:09 PM to 5:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:326:09
211.66:336:07
311.56:346:06
411.56:356:04
511.56:356:03
611.46:366:01
711.46:376:00
811.36:385:58
911.36:395:57
1011.36:405:55
1111.26:415:54
1211.26:425:53
1311.16:435:51
1411.16:445:50
1511.16:455:48
1611.06:465:47
1711.06:475:46
1810.96:485:44
1910.96:495:43
2010.96:505:42
2110.86:515:40
2210.86:525:39
2310.86:535:38
2410.76:545:37
2510.76:555:36
2610.66:565:34
2710.66:575:33
2810.66:585:32
2910.56:595:31
3010.57:005:30
3110.57:015:29

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.67 kWh/m².

For context, solar energy here swings from a low near 2.35 kWh/m² to a high of 5.75 kWh/m² in May across the year — October's 3.67 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
14.0Moderate
24.0Moderate
34.0Moderate
43.9Moderate
53.9Moderate
63.9Moderate
73.9Moderate
83.9Moderate
93.9Moderate
103.9Moderate
113.8Moderate
123.8Moderate
133.8Moderate
143.8Moderate
153.7Moderate
163.7Moderate
173.7Moderate
183.6Moderate
193.6Moderate
203.6Moderate
213.5Moderate
223.5Moderate
233.5Moderate
243.4Moderate
253.4Moderate
263.4Moderate
273.3Moderate
283.3Moderate
293.2Moderate
303.2Moderate
313.1Moderate
Planning a trip in October

Hazard calendar for Seongnam-si

In seasonPeak

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

Seongnam-si sits in the Pacific typhoon belt; the season peaks July–October.

Seongnam-si's rainy season runs July–August, 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 Seongnam-si?

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

7.0
Sightseeing
2nd-best month of the year
3.2
Beach & pool
6th-best month of the year

October is one of the better times to visit Seongnam-si for general sightseeing.

What to pack for Seongnam-si in October

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

In October, Seongnam-si sees daytime highs around 19°C and nights near 9°C. Little to plan around — just the basics. About 6 days see rain.

Sea temperature near Seongnam-si 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 46 km away) is warmest in August at about 24°C and coldest in February near 4°C.

It's comfortable for a long swim from Jul 11 to Oct 13 — 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
Jun17Cool
Jul21Refreshing
Aug24Refreshing
Sep23Refreshing
Oct20Cool
Nov15Bracing
Dec10Bracing

UV index in Seongnam-si 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 Seongnam-si peaks around August 11 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. 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 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateAug 11UV 8Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May6High
Jun7High
Jul8Very high
Aug8Very high
Sep7Very high
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Seongnam-si 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 Seongnam-si is worst in March — around 123 µg/m³ PM2.5 (unhealthy), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0306090120150JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyMar 16121 µg/m³Aug 978 µg/m³
PM2.5 (µg/m³)Level
Jan106Unhealthy
Feb108Unhealthy
Mar123Unhealthy
Apr104Unhealthy
May96Unhealthy
Jun91Unhealthy
Jul79Unhealthy
Aug78Unhealthy
Sep97Unhealthy
Oct115Unhealthy
Nov118Unhealthy
Dec100Unhealthy
Location & terrain

Where is Seongnam-si?

Seongnam-si sits at 37.4°N, 127.1°E, 80 m above sea level, in South Korea. The nearest listed city is Gwangju, 11 km away.

Topography around Seongnam-si

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

Within 3 km, the terrain around Seongnam-si has only modest variations in elevation — a maximum elevation change of 205 m around an average of 64 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 645 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,443 m.

The land around Seongnam-si is covered by artificial surfaces (58%) and trees (34%) within 3 km, trees (58%) and artificial surfaces (33%) within 16 km, and trees (53%) within 80 km.

3 km
205 m
16 km
645 m
80 km
1,443 m
treesgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: Gwangju 11 km · Hanam 13 km · Guri-si 18 km · Wabu 18 km · Gunpo 19 km · Uiwang 19 km · Anyang-si 19 km · Seoul 20 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 Seongnam-si (37.4386°, 127.1378°, elevation 80 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).