Jangheung weather in September

In September, Jangheung sees average daytime highs of 26°C and overnight lows near 18°C, with 146 mm of rain across 10.3 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 28°C in the first days to 24°C by the end. The sky is clear or mostly clear about 32% 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 Jangheung's 9th-clearest and 12th-windiest month. For the whole year in context, see Jangheung's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
18°
10th coldest
Rainfall
146 mm
10.3 wet days
Daylight
12 h 12 min
6:20 AM – 6:33 PM
Cloud cover
59%
9th clearest
Wind
9 km/h
12th windiest
Solar energy
4.23 kWh/m²
Travel score
6.6
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 28°C in the first days to 24°C by the end.

A typical September day in Jangheung reaches about 26°C in the afternoon and slips back to 18°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 29°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)
12821
22821
32821
42721
52720
62720
72720
82720
92720
102720
112719
122619
132619
142619
152619
162618
172618
182618
192518
202517
212517
222517
232517
242517
252516
262416
272416
282416
292415
302415

How September really feels in Jangheung

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.

Jangheung 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°294.41.29.90.2
Feb / -1°3850.810.71.4
Mar13° / 727.80.511.73.6
Apr18° / 1018012.86.1
May23° / 13°1148.1013.87.0
Jun25° / 18°17510.2014.36.4
Jul28° / 23°26816.1014.14.9
Aug29° / 23°23415.8013.34.6
Sep26° / 18°14610.3012.26.6
Oct21° / 12°614.8011.17.5
Nov14° / 485.5010.24.8
Dec / -1°293.90.59.71.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 52%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24258
34357
44357
54357
64357
74555
84555
94654
104654
114654
124654
134753
144753
154852
164852
174951
184951
195050
205050
215050
225050
235050
245050
255149
265149
275149
285248
295248
305446

Chance of precipitation in September

Any precipitation

Jangheung gets around 146 mm of rain over 10.3 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 35% 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
740
840
939
1039
1138
1237
1336
1436
1535
1634
1733
1832
1932
2031
2130
2229
2329
2428
2528
2627
2726
2826
2925
3024

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 45% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1121839338
2121939317
3132040306
4142140295
5142241284
6252340264
7262440253
8272539242
9392639222
103102738211
114122737201
124142835191
135152834171
146172832161
157192830151
168212828141
179232927121
1810242926111
1911262924101
201227292391
211328292180
221430292070
231631281960
241832281750
251932271650
262133261540
272333261430
282633251430
292833231320
303132221220

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
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
2510calm
2610calm
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 6:09 AM to 6:31 AM, and sunset from 6:55 PM to 6:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:096:55
212.76:106:54
312.76:116:52
412.76:116:51
512.66:126:49
612.66:136:48
712.56:146:46
812.56:146:45
912.56:156:43
1012.46:166:42
1112.46:176:41
1212.46:176:39
1312.36:186:38
1412.36:196:36
1512.36:206:35
1612.26:206:33
1712.26:216:32
1812.16:226:30
1912.16:236:29
2012.16:236:27
2112.06:246:26
2212.06:256:24
2312.06:266:23
2411.96:266:21
2511.96:276:20
2611.86:286:18
2711.86:296:17
2811.86:296:15
2911.76:306:14
3011.76:316:12

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.23 kWh/m².

For context, solar energy here swings from a low near 2.47 kWh/m² to a high of 5.72 kWh/m² in May across the year — September's 4.23 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
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.2Bright
174.2Bright
184.2Bright
194.2Bright
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 Jangheung

In seasonPeak

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

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

Jangheung'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 September a good time to visit Jangheung?

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

6.6
Sightseeing
3rd-best month of the year
6.2
Beach & pool
1st-best month of the year

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

What to pack for Jangheung in September

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

In September, Jangheung 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 Jangheung 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 40 km away) is warmest in August at about 26°C and coldest in March near 12°C.

It's comfortable for a long swim from Jun 23 to Oct 19 — about 3.9 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar12Bracing
Apr13Bracing
May16Cool
Jun19Cool
Jul23Refreshing
Aug26Warm
Sep24Refreshing
Oct20Refreshing
Nov17Cool
Dec15Bracing

UV index in Jangheung in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Jangheung peaks around July 14 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 highHighModerateJul 14UV 8Dec 22UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar6High
Apr7High
May8Very high
Jun8Very high
Jul8Very high
Aug8Very high
Sep8Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Jangheung 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 Jangheung is worst in March — around 43 µg/m³ PM2.5 (poor), about 2.4× the cleanest month (July, 18 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateMar 1842 µg/m³Jul 2418 µg/m³
PM2.5 (µg/m³)Level
Jan31Moderate
Feb36Poor
Mar43Poor
Apr37Poor
May30Moderate
Jun25Moderate
Jul18Moderate
Aug18Moderate
Sep22Moderate
Oct24Moderate
Nov27Moderate
Dec26Moderate
Location & terrain

Where is Jangheung?

Jangheung sits at 34.7°N, 126.9°E, 28 m above sea level, in South Korea. The nearest listed city is Boseong, 19 km away.

NajuHwasunBeolgyoMokpoMasan

Topography around Jangheung

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

Within 3 km, the terrain around Jangheung has significant variations in elevation — a maximum elevation change of 365 m around an average of 67 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 772 m; within 80 km, large variations in elevation — a maximum elevation change of 1,195 m.

The land around Jangheung is covered by trees (45%) and cropland (32%) within 3 km, trees (65%) and cropland (21%) within 16 km, and water (43%) and trees (38%) within 80 km.

3 km
365 m
16 km
772 m
80 km
1,195 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Boseong 19 km · Yeongam 23 km · Haenam 31 km · Naju 42 km · Hwasun 43 km · Beolgyo 44 km · Mokpo 49 km · Masan 50 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 Jangheung (34.6816°, 126.9069°, elevation 28 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).