Gwangmyeong weather in September

In September, Gwangmyeong sees average daytime highs of 25°C and overnight lows near 18°C, with 121 mm of rain across 7.6 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 27°C in the first days to 23°C by the end. The sky is clear or mostly clear about 41% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Gwangmyeong's 9th-clearest and 12th-windiest month. For the whole year in context, see Gwangmyeong's year-round climate.

Daytime high
25°
3rd warmest
Overnight low
18°
9th coldest
Rainfall
121 mm
7.6 wet days
Daylight
12 h 12 min
6:20 AM – 6:34 PM
Cloud cover
54%
9th clearest
Wind
9 km/h
12th windiest
Solar energy
4.29 kWh/m²
Travel score
7.2
out of 10

Gwangmyeong is human settlement in South Korea.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 27°C in the first days to 23°C by the end.

A typical September day in Gwangmyeong reaches about 25°C in the afternoon and slips back to 18°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 28°C. Set against its neighbours, September runs about 3°C cooler than August and about 6°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12721
22721
32721
42720
52720
62720
72620
82620
92619
102619
112619
122619
132619
142618
152518
162518
172518
182518
192517
202517
212417
222417
232416
242416
252416
262416
272316
282315
292315
302315

How September really feels in Gwangmyeong

Once humidity and wind are folded in, September 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

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

Gwangmyeong weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -6°193.629.70.0
Feb / -4°243.81.410.60.2
Mar10° / 365.50.811.72.4
Apr16° / 657012.95.3
May21° / 13°927.50146.9
Jun25° / 18°1227.8014.57.1
Jul27° / 22°29815.1014.35.5
Aug29° / 23°24413.8013.45.3
Sep25° / 18°1217.6012.37.2
Oct19° / 11°545.30117.1
Nov12° / 487.30.3103.3
Dec / -3°2251.29.50.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 47%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24951
34951
44951
55050
65149
75149
85149
95149
105149
115248
125248
135248
145347
155446
165446
175545
185545
195545
205644
215644
225743
235644
245644
255644
265644
275743
285743
295743
305842

Chance of precipitation in September

Any precipitation

Gwangmyeong gets around 121 mm of rain over 7.6 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 26% and peaks near 36% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
136
235
334
433
532
631
730
830
929
1028
1128
1227
1327
1426
1526
1625
1725
1824
1923
2023
2122
2222
2322
2421
2521
2621
2721
2820
2920
3020

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 27% of days. Sticky, muggy-or-worse air turns up on roughly 38% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1151741334
2161941303
3172141283
4182241262
5292341242
62102441221
72112540201
83132640181
94142739160
104152838140
115172936130
126192935110
137203033100
14822303190
15923312980
161125312770
171226312560
181427312350
191528312140
201729312040
211930311830
222031301620
232231301420
242432291310
252733291110
262933281010
27313326910
28343325800
29363324700
30393322600

Wind in September

Winds average 9 km/h in September, the calmest month.

Across September, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
2710calm
2810calm
2910calm
3010calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 6:07 AM to 6:32 AM, and sunset from 6:58 PM to 6:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:076:58
212.86:086:56
312.86:096:55
412.76:096:53
512.76:106:51
612.66:116:50
712.66:126:48
812.66:136:47
912.56:146:45
1012.56:156:44
1112.46:156:42
1212.46:166:40
1312.46:176:39
1412.36:186:37
1512.36:196:36
1612.26:206:34
1712.26:216:32
1812.26:216:31
1912.16:226:29
2012.16:236:28
2112.06:246:26
2212.06:256:24
2311.96:266:23
2411.96:276:21
2511.96:286:20
2611.86:286:18
2711.86:296:16
2811.76:306:15
2911.76:316:13
3011.76:326:12

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.29 kWh/m².

For context, solar energy here swings from a low near 2.33 kWh/m² to a high of 5.82 kWh/m² in May across the year — September's 4.29 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.3Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.2Bright
264.1Bright
274.1Bright
284.1Bright
294.1Bright
304.1Bright
Planning a trip in September

Hazard calendar for Gwangmyeong

In seasonPeak

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

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

Gwangmyeong'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 September a good time to visit Gwangmyeong?

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

7.2
Sightseeing
1st-best month of the year
6.4
Beach & pool
1st-best month of the year

September is one of the better times to visit Gwangmyeong for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Gwangmyeong in September

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

In September, Gwangmyeong sees daytime highs around 25°C and nights near 18°C. Worth packing: light clothes. About 8 days see rain.

light clothes

Sea temperature near Gwangmyeong in September

The nearest coast averages about 23°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 24 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 Gwangmyeong in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Gwangmyeong peaks around July 22 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 highHighModerateJul 22UV 8Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May5High
Jun7High
Jul8Very high
Aug8Very high
Sep7High
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Gwangmyeong in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Gwangmyeong is worst in March — around 160 µg/m³ PM2.5 (very unhealthy), about 2.0× the cleanest month (August, 81 µg/m³).

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

0306090120150180JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyVery unhealthyUnhealthyMar 13158 µg/m³Aug 1282 µg/m³
PM2.5 (µg/m³)Level
Jan145Unhealthy
Feb149Unhealthy
Mar160Very unhealthy
Apr127Unhealthy
May111Unhealthy
Jun98Unhealthy
Jul88Unhealthy
Aug81Unhealthy
Sep110Unhealthy
Oct132Unhealthy
Nov142Unhealthy
Dec133Unhealthy
Location & terrain

Where is Gwangmyeong?

Gwangmyeong sits at 37.5°N, 126.9°E, 30 m above sea level, in South Korea. The nearest listed city is Siheungdong, 5.0 km away.

Topography around Gwangmyeong

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

Within 3 km, the terrain around Gwangmyeong has only modest variations in elevation — a maximum elevation change of 194 m around an average of 30 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 604 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,443 m.

The land around Gwangmyeong is covered by artificial surfaces (69%) and trees (26%) within 3 km, artificial surfaces (51%) and trees (35%) within 16 km, and trees (42%) and water (24%) within 80 km.

3 km
194 m
16 km
604 m
80 km
1,443 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Siheungdong 5.0 km · Bucheon-si 8.0 km · Anyang-si 11 km · Seoul 14 km · Gunpo 14 km · Uiwang 14 km · Incheon 14 km · Ansan 18 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 Gwangmyeong (37.4772°, 126.8664°, elevation 30 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).