Gyeongsan-si weather in September

In September, Gyeongsan-si sees average daytime highs of 26°C and overnight lows near 17°C, with 135 mm of rain across 8.7 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 28% 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 Gyeongsan-si's 9th-clearest and 10th-windiest month. For the whole year in context, see Gyeongsan-si's year-round climate.

Daytime high
26°
4th warmest
Overnight low
17°
9th coldest
Rainfall
135 mm
8.7 wet days
Daylight
12 h 12 min
6:13 AM – 6:26 PM
Cloud cover
62%
9th clearest
Wind
8 km/h
10th windiest
Solar energy
3.94 kWh/m²
Travel score
6.8
out of 10

Gyeongsan-si is city in North Gyeongsang Province, South Korea.

Density
649/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 Gyeongsan-si 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 22°C and 29°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12820
22820
32819
42819
52719
62719
72719
82718
92718
102718
112618
122618
132617
142617
152617
162617
172616
182516
192516
202516
212516
222515
232515
242515
252415
262414
272414
282414
292414
302413

How September really feels in Gyeongsan-si

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.

Gyeongsan-si 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°223.319.80.2
Feb / -2°2940.910.61.6
Mar13° / 606.7111.74.2
Apr20° / 777.20.112.96.7
May25° / 13°887013.97.3
Jun28° / 18°1278.8014.46.3
Jul29° / 22°20013.3014.24.7
Aug30° / 22°18713.6013.44.5
Sep26° / 17°1358.7012.26.8
Oct21° / 10°554.6011.17.5
Nov14° / 364.50.110.14.8
Dec / -2°223.20.59.61.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% 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 57%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13763
23961
33862
43862
53862
63862
73862
83961
93961
103862
113961
124159
134159
144258
154258
164357
174357
184456
194456
204654
214654
224753
234753
244753
254852
264951
274951
284951
294951
305248

Chance of precipitation in September

Any precipitation

Gyeongsan-si gets around 135 mm of rain over 8.7 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 39% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
139
239
338
437
537
636
736
835
935
1034
1133
1232
1332
1431
1530
1629
1728
1827
1926
2025
2124
2224
2323
2423
2523
2622
2722
2821
2921
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 30% of days. Sticky, muggy-or-worse air turns up on roughly 25% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
11123130242
22133229222
32143428211
43153527191
54163626181
64163725161
75173725151
86183824140
98193823120
109203822110
1110213721100
121222362090
131423361980
141624341880
151825331770
162026321660
172227311550
182428301350
192628291240
202829281140
213030271030
22323025930
23343124830
24363123820
25383122720
26403121620
27433020610
28452919510
29482918510
30502817410

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
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
297calm
307calm

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 6:01 AM to 6:24 AM, and sunset from 6:49 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:016:49
212.86:026:47
312.76:026:46
412.76:036:44
512.66:046:43
612.66:056:41
712.66:066:40
812.56:066:38
912.56:076:37
1012.56:086:35
1112.46:096:34
1212.46:106:32
1312.36:106:31
1412.36:116:29
1512.36:126:28
1612.26:136:26
1712.26:136:25
1812.16:146:23
1912.16:156:21
2012.16:166:20
2112.06:176:18
2212.06:176:17
2312.06:186:15
2411.96:196:14
2511.96:206:12
2611.86:216:11
2711.86:216:09
2811.86:226:08
2911.76:236:06
3011.76:246:05

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.94 kWh/m².

For context, solar energy here swings from a low near 2.62 kWh/m² to a high of 5.79 kWh/m² in May across the year — September's 3.94 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
34.1Bright
44.0Bright
54.0Bright
64.0Bright
74.0Bright
84.0Moderate
94.0Moderate
104.0Moderate
113.9Moderate
123.9Moderate
133.9Moderate
143.9Moderate
153.9Moderate
163.9Moderate
173.9Moderate
183.9Moderate
193.9Moderate
203.9Moderate
213.9Moderate
223.9Moderate
233.9Moderate
243.9Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.9Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Gyeongsan-si

In seasonPeak

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

Gyeongsan-si sits in the Pacific typhoon belt; the season peaks July–October.

Gyeongsan-si'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 Gyeongsan-si?

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
6.4
Beach & pool
2nd-best month of the year

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

What to pack for Gyeongsan-si in September

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

In September, Gyeongsan-si sees daytime highs around 26°C and nights near 17°C. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

UV index in Gyeongsan-si 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 Gyeongsan-si peaks around August 15 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 highHighModerateAug 15UV 9Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5Moderate
Apr7High
May8Very high
Jun8Very high
Jul8Very high
Aug9Very high
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Gyeongsan-si 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 Gyeongsan-si is worst in March — around 66 µg/m³ PM2.5 (unhealthy), about 1.9× the cleanest month (August, 34 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyPoorPoorMar 1865 µg/m³Aug 1535 µg/m³
PM2.5 (µg/m³)Level
Jan51Poor
Feb57Unhealthy
Mar66Unhealthy
Apr60Unhealthy
May55Poor
Jun47Poor
Jul37Poor
Aug34Moderate
Sep39Poor
Oct47Poor
Nov56Unhealthy
Dec47Poor
Location & terrain

Where is Gyeongsan-si?

Gyeongsan-si sits at 35.8°N, 128.7°E, 59 m above sea level, in South Korea. The nearest listed city is Hayang, 12 km away.

WaegwanMiryangChangnyeongGyeongju

Topography around Gyeongsan-si

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

Within 3 km, the terrain around Gyeongsan-si has significant variations in elevation — a maximum elevation change of 421 m around an average of 96 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 889 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,396 m.

The land around Gyeongsan-si is covered by artificial surfaces (45%) and trees (33%) within 3 km, trees (61%) within 16 km, and trees (71%) within 80 km.

3 km
421 m
16 km
889 m
80 km
1,396 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Hayang 12 km · Daegu 14 km · Hwawŏn 22 km · Eisen 24 km · Waegwan 36 km · Miryang 37 km · Changnyeong 38 km · Gyeongju 43 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 Gyeongsan-si (35.8233°, 128.7378°, elevation 59 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). 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).