Gwangyang weather in September

In September, Gwangyang sees average daytime highs of 26°C and overnight lows near 18°C, with 170 mm of rain across 10.1 wet days and about 12.2 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 24°C by the end. The sky is clear or mostly clear about 31% of the time in September, and the air most often feels muggy.

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 Gwangyang's 9th-clearest and 9th-windiest month. For the whole year in context, see Gwangyang's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
18°
9th coldest
Rainfall
170 mm
10.1 wet days
Daylight
12 h 12 min
6:17 AM – 6:30 PM
Cloud cover
60%
9th clearest
Wind
8 km/h
9th windiest
Solar energy
4.25 kWh/m²
Travel score
6.7
out of 10

Gwangyang is city of Jeollanam-do, South Korea.

Density
336/km²
people per km²

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 24°C by the end.

A typical September day in Gwangyang reaches about 26°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 5°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12721
22721
32721
42721
52721
62720
72720
82720
92620
102620
112619
122619
132619
142619
152619
162618
172518
182518
192518
202518
212517
222517
232517
242417
252417
262416
272416
282416
292416
302415

How September really feels in Gwangyang

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.

Gwangyang 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 / -3°303.90.99.90.4
Feb / -1°444.70.710.71.5
Mar13° / 827.30.611.73.7
Apr18° / 1278.5012.96.0
May22° / 14°1448.1013.87.0
Jun25° / 19°19510.2014.36.5
Jul28° / 23°30917.1014.14.9
Aug29° / 23°28616.4013.34.8
Sep26° / 18°17010.1012.26.7
Oct21° / 12°704.6011.17.5
Nov14° / 475.20.110.24.9
Dec / -1°283.60.49.71.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 55%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13961
23961
33961
43961
54060
64060
74159
84258
94159
104258
114258
124456
134456
144555
154654
164654
174753
184753
194852
204852
214951
224951
234951
245050
255050
265050
275149
285248
295248
305248

Chance of precipitation in September

Any precipitation

Gwangyang gets around 170 mm of rain over 10.1 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 34% and peaks near 46% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
146
245
344
443
542
641
741
840
939
1039
1138
1237
1336
1435
1534
1633
1732
1831
1930
2030
2129
2228
2327
2427
2526
2625
2725
2824
2923
3023

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 28% of days. Sticky, muggy-or-worse air turns up on roughly 44% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1031938337
2032138326
3042239305
4152339284
5162439274
6172539253
7182639242
8292639222
92112738212
102122737201
113142836181
124152835171
135172834161
145192832151
156212830141
167222829131
179242827110
1810262826100
191127282490
201229282380
211430272180
221531272070
231732271960
241833261750
252033261640
262234251540
272434241430
282734231330
292934221220
303233211120

Wind in September

Winds average 8 km/h in September.

Across September, 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.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
149calm
159calm
169calm
179calm
189calm
199calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

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 6:06 AM to 6:28 AM, and sunset from 6:52 PM to 6:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:066:52
212.76:076:51
312.76:076:49
412.76:086:48
512.66:096:46
612.66:106:45
712.66:106:43
812.56:116:42
912.56:126:40
1012.46:136:39
1112.46:136:37
1212.46:146:36
1312.36:156:35
1412.36:166:33
1512.36:166:32
1612.26:176:30
1712.26:186:29
1812.16:196:27
1912.16:196:26
2012.16:206:24
2112.06:216:23
2212.06:226:21
2312.06:226:20
2411.96:236:18
2511.96:246:17
2611.86:256:15
2711.86:256:14
2811.86:266:12
2911.76:276:11
3011.76:286:09

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.25 kWh/m².

For context, solar energy here swings from a low near 2.65 kWh/m² to a high of 5.8 kWh/m² in May across the year — September's 4.25 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.4Bright
54.3Bright
64.3Bright
74.3Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.2Bright
174.2Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.2Bright
264.2Bright
274.2Bright
284.1Bright
294.1Bright
304.1Bright
Planning a trip in September

Hazard calendar for Gwangyang

In seasonPeak

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

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

Gwangyang's rainy season runs May–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 September a good time to visit Gwangyang?

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

6.7
Sightseeing
3rd-best month of the year
6.2
Beach & pool
1st-best month of the year

September is a reasonable time to visit Gwangyang for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Gwangyang in September

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

In September, Gwangyang sees daytime highs around 26°C and nights near 18°C. Worth packing: light clothes and rain gear. About 10 days see rain.

light clothesrain gear

Sea temperature near Gwangyang in September

The nearest coast averages about 24°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 36 km away) is warmest in August at about 26°C and coldest in February near 12°C.

It's comfortable for a long swim from Jun 20 to Oct 22 — about 4.1 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb12Bracing
Mar12Bracing
Apr13Bracing
May16Cool
Jun20Cool
Jul23Refreshing
Aug26Warm
Sep24Warm
Oct21Refreshing
Nov17Cool
Dec14Bracing

UV index in Gwangyang in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Gwangyang peaks around August 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 20UV 9Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun8Very high
Jul8Very high
Aug9Very high
Sep9Very high
Oct5High
Nov4Moderate
Dec2Moderate

Air quality in Gwangyang 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 Gwangyang is worst in March — around 57 µg/m³ PM2.5 (unhealthy), about 2.0× the cleanest month (July, 28 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorPoorModeratePoorMar 1856 µg/m³Jul 2229 µg/m³
PM2.5 (µg/m³)Level
Jan42Poor
Feb47Poor
Mar57Unhealthy
Apr49Poor
May42Poor
Jun38Poor
Jul28Moderate
Aug30Moderate
Sep37Poor
Oct40Poor
Nov44Poor
Dec39Poor
Location & terrain

Where is Gwangyang?

Gwangyang sits at 34.9°N, 127.7°E, 24 m above sea level, in South Korea. The nearest listed city is Kwangyang, 10 km away.

KuryeChinjuGoseong

Topography around Gwangyang

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

Within 3 km, the terrain around Gwangyang has significant variations in elevation — a maximum elevation change of 487 m around an average of 67 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,005 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,875 m.

The land around Gwangyang is covered by trees (43%) and artificial surfaces (32%) within 3 km, trees (48%) and water (23%) within 16 km, and trees (53%) and water (34%) within 80 km.

3 km
487 m
16 km
1,005 m
80 km
1,875 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Kwangyang 10 km · Hadong 15 km · Suncheon 19 km · Yeosu 20 km · Beolgyo 34 km · Kurye 36 km · Chinju 45 km · Goseong 57 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 Gwangyang (34.9414°, 127.6957°, elevation 24 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).