Iksan weather in September

In September, Iksan sees average daytime highs of 26°C and overnight lows near 17°C, with 145 mm of rain across 8.4 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 3rd-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 36% 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 Iksan's 7th-clearest and 11th-windiest month. For the whole year in context, see Iksan's year-round climate.

Daytime high
26°
4th warmest
Overnight low
17°
9th coldest
Rainfall
145 mm
8.4 wet days
Daylight
12 h 12 min
6:20 AM – 6:33 PM
Cloud cover
56%
7th clearest
Wind
8 km/h
11th windiest
Solar energy
4.32 kWh/m²
Travel score
6.8
out of 10

Iksan is city in South Korea.

Density
606/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 28°C in the first days to 24°C by the end.

A typical September day in Iksan reaches about 26°C in the afternoon and slips back to 17°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 30°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12820
22820
32820
42820
52820
62819
72819
82719
92719
102719
112718
122718
132718
142718
152617
162617
172617
182617
192617
202616
212616
222516
232516
242515
252515
262515
272515
282414
292414
302414

How September really feels in Iksan

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.

Iksan weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -4°244.92.49.80.0
Feb / -3°324.71.310.60.9
Mar12° / 506.90.811.73.6
Apr19° / 817.1012.96.4
May24° / 13°877.4013.97.3
Jun27° / 18°1338.9014.46.4
Jul29° / 23°26215.9014.24.5
Aug30° / 23°23315013.44.4
Sep26° / 17°1458.4012.26.8
Oct21° / 10°584.8011.17.5
Nov14° / 436.20.110.14.4
Dec / -2°254.91.59.60.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% 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 50%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14258
24357
34357
44456
54456
64456
74456
84555
94654
104753
114852
124852
134951
145050
154951
164951
175149
185248
195248
205347
215347
225446
235446
245446
255446
265644
275644
285644
295743
305743

Chance of precipitation in September

Any precipitation

Iksan gets around 145 mm of rain over 8.4 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 29% and peaks near 41% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
141
240
339
438
537
636
735
834
934
1033
1132
1231
1331
1430
1529
1628
1727
1826
1925
2024
2124
2223
2323
2422
2522
2621
2721
2820
2920
3019

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 34% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1162238303
2172438283
3172638272
4282737242
5292837222
63103036201
74113135191
85123134171
95133233161
106153232140
118163230130
129183229120
1310203227110
1412213126100
151323312490
161525302380
171726292170
181828282060
192029271850
202231261650
212432261540
222633251430
232833241230
243034231120
253234221020
26343422920
27373321810
28393320710
29423219610
30453118610

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 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
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

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 6:08 AM to 6:31 AM, and sunset from 6:56 PM to 6:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:086:56
212.86:096:54
312.76:106:53
412.76:106:51
512.66:116:50
612.66:126:48
712.66:136:47
812.56:136:45
912.56:146:44
1012.56:156:42
1112.46:166:41
1212.46:176:39
1312.36:176:38
1412.36:186:36
1512.36:196:35
1612.26:206:33
1712.26:216:32
1812.16:216:30
1912.16:226:29
2012.16:236:27
2112.06:246:26
2212.06:256:24
2312.06:256:22
2411.96:266:21
2511.96:276:19
2611.86:286:18
2711.86:296:16
2811.86:296:15
2911.76:306:13
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 4.32 kWh/m².

For context, solar energy here swings from a low near 2.29 kWh/m² to a high of 5.89 kWh/m² in May across the year — September's 4.32 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.4Bright
54.4Bright
64.4Bright
74.4Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.2Bright
254.2Bright
264.2Bright
274.2Bright
284.2Bright
294.2Bright
304.2Bright
Planning a trip in September

Hazard calendar for Iksan

In seasonPeak

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

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

Iksan'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 Iksan?

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

6.8
Sightseeing
3rd-best month of the year
6.6
Beach & pool
2nd-best month of the year

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

What to pack for Iksan in September

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

In September, Iksan sees daytime highs around 26°C and nights near 17°C. Worth packing: light clothes and rain gear. About 8 days see rain.

light clothesrain gear

Sea temperature near Iksan 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 31 km away) is warmest in August at about 26°C and coldest in February near 6°C.

It's comfortable for a long swim from Jun 25 to Oct 10 — about 3.6 months when the water holds above 20°C.

0°10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan7Bracing
Feb6Bracing
Mar6Bracing
Apr9Bracing
May14Bracing
Jun19Cool
Jul23Refreshing
Aug26Warm
Sep23Refreshing
Oct19Cool
Nov15Bracing
Dec10Bracing

UV index in Iksan in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Iksan peaks around September 11 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 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 highHighModerateSep 11UV 8Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5High
Apr6High
May7Very high
Jun7Very high
Jul7Very high
Aug7Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Moderate

Air quality in Iksan 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 Iksan is worst in March — around 64 µg/m³ PM2.5 (unhealthy), about 2.0× the cleanest month (July, 32 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyPoorModeratePoorMar 1663 µg/m³Jul 2133 µg/m³
PM2.5 (µg/m³)Level
Jan52Poor
Feb56Unhealthy
Mar64Unhealthy
Apr55Poor
May46Poor
Jun42Poor
Jul32Moderate
Aug35Moderate
Sep43Poor
Oct48Poor
Nov51Poor
Dec48Poor
Location & terrain

Where is Iksan?

Iksan sits at 35.9°N, 127.0°E, 16 m above sea level, in South Korea. The nearest listed city is Namsa, 9.0 km away.

Topography around Iksan

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

Within 3 km, the terrain around Iksan has only modest variations in elevation — a maximum elevation change of 73 m around an average of 13 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 429 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,594 m.

The land around Iksan is covered by artificial surfaces (59%) and cropland (30%) within 3 km, cropland (57%) within 16 km, and trees (51%), water (22%) and cropland (20%) within 80 km.

3 km
73 m
16 km
429 m
80 km
1,594 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Namsa 9.0 km · Kimje 17 km · Wanju 21 km · Jeonju 22 km · Gunsan 22 km · Yŏnmu 24 km · Nonsan 31 km · Buan 31 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 Iksan (35.9439°, 126.9544°, elevation 16 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).