Yangsan weather in September

In September, Yangsan sees average daytime highs of 26°C and overnight lows near 19°C, with 163 mm of rain across 9.6 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 3rd-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 30% 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 Yangsan's 9th-clearest and 6th-windiest month. For the whole year in context, see Yangsan's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
19°
10th coldest
Rainfall
163 mm
9.6 wet days
Daylight
12 h 12 min
6:12 AM – 6:25 PM
Cloud cover
61%
9th clearest
Wind
12 km/h
6th windiest
Solar energy
4.17 kWh/m²
Travel score
6.7
out of 10

Yangsan is a city in South Gyeongsang Province, South Korea.

Density
740/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 Yangsan reaches about 26°C in the afternoon and slips back to 19°C overnight — a 7°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 4°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12822
22821
32721
42721
52721
62721
72721
82721
92720
102720
112620
122620
132620
142619
152619
162619
172619
182519
192518
202518
212518
222518
232518
242518
252517
262417
272417
282417
292417
302416

How September really feels in Yangsan

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.

Yangsan weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°304.20.49.91.2
Feb / 414.60.510.72.3
Mar14° / 797.40.511.74.2
Apr18° / 1117.8012.96.2
May22° / 14°1187.9013.87.0
Jun25° / 18°1599.2014.36.7
Jul28° / 22°24213.9014.15.3
Aug29° / 23°21113.4013.35.0
Sep26° / 19°1639.6012.26.7
Oct21° / 13°714.7011.17.6
Nov15° / 4850.110.15.5
Dec / 283.60.39.72.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% 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 55%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13961
23961
33961
44060
54060
64060
74159
84159
94258
104258
114357
124357
134456
144456
154654
164654
174654
184654
194852
204852
214852
224852
234852
244951
254951
265050
274951
284951
295050
305050

Chance of precipitation in September

Any precipitation

Yangsan gets around 163 mm of rain over 9.6 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 32% and peaks near 40% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
140
240
339
439
538
638
737
837
937
1036
1135
1235
1334
1433
1532
1631
1730
1830
1929
2028
2128
2227
2326
2426
2525
2625
2724
2824
2923
3022

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 41% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1042335317
2052435306
3152536286
4162636265
5172737254
6272837234
7282837223
82102936203
93112936192
103122935182
114142934172
125162933161
136182931151
147192930141
158212928131
1610232827120
1711242825110
1812262824100
191427272290
201529272190
211730271980
221831261870
232031261660
242132261560
252332251450
262632251350
272832241240
283031241140
293331231030
303630221030

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812calm
2912calm
3012calm

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 6:00 AM to 6:23 AM, and sunset from 6:47 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:006:47
212.76:016:46
312.76:026:44
412.76:026:43
512.66:036:41
612.66:046:40
712.66:056:38
812.56:056:37
912.56:066:35
1012.46:076:34
1112.46:086:32
1212.46:096:31
1312.36:096:29
1412.36:106:28
1512.36:116:26
1612.26:126:25
1712.26:126:23
1812.16:136:22
1912.16:146:20
2012.16:156:19
2112.06:156:17
2212.06:166:16
2312.06:176:14
2411.96:186:13
2511.96:196:11
2611.86:196:10
2711.86:206:08
2811.86:216:07
2911.76:226:05
3011.76:236:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.17 kWh/m².

For context, solar energy here swings from a low near 2.67 kWh/m² to a high of 5.9 kWh/m² in May across the year — September's 4.17 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.3Bright
54.3Bright
64.3Bright
74.3Bright
84.3Bright
94.3Bright
104.2Bright
114.2Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.2Bright
174.2Bright
184.2Bright
194.1Bright
204.1Bright
214.1Bright
224.1Bright
234.1Bright
244.1Bright
254.1Bright
264.1Bright
274.1Bright
284.0Bright
294.0Bright
304.0Bright
Planning a trip in September

Hazard calendar for Yangsan

In seasonPeak

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

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

Yangsan's rainy season runs April–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 Yangsan?

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
6.3
Beach & pool
2nd-best month of the year

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

What to pack for Yangsan in September

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

In September, Yangsan sees daytime highs around 26°C and nights near 19°C. Worth packing: light clothes and rain gear. About 10 days see rain.

light clothesrain gear

Sea temperature near Yangsan in September

The nearest coast averages about 25°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 26 km away) is warmest in August at about 26°C and coldest in February near 14°C.

It's comfortable for a long swim from Jun 17 to Nov 7 — about 4.7 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb14Bracing
Mar14Bracing
Apr15Bracing
May17Cool
Jun20Refreshing
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec17Cool

UV index in Yangsan 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 Yangsan peaks around August 18 at about 9 (very high) — sunscreen, a hat and midday shade are essential. 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 highModerateAug 18UV 9Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5High
Apr7High
May8Very high
Jun8Very high
Jul8Very high
Aug9Very high
Sep9Very high
Oct5High
Nov4Moderate
Dec2Moderate

Air quality in Yangsan 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 Yangsan is worst in March — around 68 µg/m³ PM2.5 (unhealthy), about 1.6× the cleanest month (August, 42 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyPoorPoorMar 2168 µg/m³Aug 1942 µg/m³
PM2.5 (µg/m³)Level
Jan52Poor
Feb58Unhealthy
Mar68Unhealthy
Apr66Unhealthy
May65Unhealthy
Jun55Poor
Jul46Poor
Aug42Poor
Sep44Poor
Oct50Poor
Nov58Unhealthy
Dec48Poor
Location & terrain

Where is Yangsan?

Yangsan sits at 35.3°N, 129.0°E, 6 m above sea level, in South Korea. The nearest listed city is Ungsang, 14 km away.

ChangwonNaesŏ

Topography around Yangsan

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

Within 3 km, the terrain around Yangsan has significant variations in elevation — a maximum elevation change of 492 m around an average of 100 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 946 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,204 m.

The land around Yangsan is covered by trees (54%) and artificial surfaces (36%) within 3 km, trees (74%) within 16 km, and trees (44%) and water (39%) within 80 km.

3 km
492 m
16 km
946 m
80 km
1,204 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Ungsang 14 km · Kimhae 18 km · Gijang 20 km · Busan 27 km · Miryang 31 km · Ulsan 34 km · Changwon 34 km · Naesŏ 48 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 Yangsan (35.342°, 129.0336°, elevation 6 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).