Gongju weather in September

In September, Gongju sees average daytime highs of 26°C and overnight lows near 17°C, with 147 mm of rain across 8.6 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 33% 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 Gongju's 8th-clearest and 12th-windiest month. For the whole year in context, see Gongju's year-round climate.

Daytime high
26°
4th warmest
Overnight low
17°
9th coldest
Rainfall
147 mm
8.6 wet days
Daylight
12 h 12 min
6:19 AM – 6:33 PM
Cloud cover
57%
8th clearest
Wind
8 km/h
12th windiest
Solar energy
4.26 kWh/m²
Travel score
6.9
out of 10

Gongju is City in South Chungcheong Province, South Korea.

Density
77/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 Gongju 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 6°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12820
22820
32820
42819
52719
62719
72719
82718
92718
102718
112718
122618
132617
142617
152617
162617
172617
182616
192516
202516
212516
222515
232515
242515
252415
262414
272414
282414
292414
302313

How September really feels in Gongju

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.

Gongju 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 / -5°224.22.59.80.0
Feb / -3°304.31.610.60.6
Mar12° / 476.41.211.73.4
Apr18° / 797.30.112.96.3
May24° / 12°847.4013.97.3
Jun28° / 18°1268.7014.46.4
Jul29° / 22°26516.1014.24.5
Aug30° / 22°24215.2013.44.5
Sep26° / 17°1478.6012.26.9
Oct20° / 10°595011.17.3
Nov13° / 456.10.210.13.9
Dec / -3°244.61.99.60.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% 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 51%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14258
24357
34357
44357
54456
64555
74555
84555
94555
104654
114753
124654
134654
144753
154753
165050
175050
185149
195149
205248
215347
225347
235347
245347
255446
265446
275446
285545
295545
305545

Chance of precipitation in September

Any precipitation

Gongju gets around 147 mm of rain over 8.6 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 29% and peaks near 43% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
143
242
341
440
539
638
737
835
934
1033
1132
1231
1330
1429
1528
1628
1727
1826
1925
2024
2124
2223
2323
2422
2522
2622
2721
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 28% of days. Sticky, muggy-or-worse air turns up on roughly 29% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1192735252
21102834242
32113033222
42123232202
53133332181
63143431171
74153530151
85163529141
96173628120
108183627110
119203526100
121121352590
131322342480
141523332270
151724322160
161925302050
172126291940
182427281740
192628271630
202829261430
213030251320
223231241120
233431231020
24373222910
25393220810
26413219710
27433218610
28463117610
29483116500
30503015500

Wind in September

Winds average 8 km/h in September, the calmest month.

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 6:07 AM to 6:31 AM, and sunset from 6:56 PM to 6:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:076:56
212.86:086:54
312.76:086:53
412.76:096:51
512.76:106:50
612.66:116:48
712.66:126:47
812.56:126:45
912.56:136:44
1012.56:146:42
1112.46:156:40
1212.46:166:39
1312.36:176:37
1412.36:176:36
1512.36:186:34
1612.26:196:33
1712.26:206:31
1812.16:216:30
1912.16:216:28
2012.16:226:26
2112.06:236:25
2212.06:246:23
2312.06:256:22
2411.96:266:20
2511.96:266:19
2611.86:276:17
2711.86:286:16
2811.86:296:14
2911.76:306:13
3011.76:316:11

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.26 kWh/m².

For context, solar energy here swings from a low near 2.25 kWh/m² to a high of 5.91 kWh/m² in May across the year — September's 4.26 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
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.2Bright
264.2Bright
274.1Bright
284.1Bright
294.1Bright
304.1Bright
Planning a trip in September

Hazard calendar for Gongju

In seasonPeak

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

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

Gongju'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 Gongju?

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

6.9
Sightseeing
3rd-best month of the year
6.4
Beach & pool
2nd-best month of the year

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

What to pack for Gongju in September

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

In September, Gongju 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

Sea temperature near Gongju 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 58 km away) is warmest in August at about 26°C and coldest in February near 5°C.

It's comfortable for a long swim from Jun 26 to Oct 10 — about 3.5 months when the water holds above 20°C.

0°10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan7Bracing
Feb5Bracing
Mar6Bracing
Apr9Bracing
May14Bracing
Jun19Cool
Jul23Refreshing
Aug26Warm
Sep23Refreshing
Oct19Cool
Nov15Bracing
Dec11Bracing

UV index in Gongju 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 Gongju peaks around August 14 at about 8 (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 14UV 8Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5Moderate
Apr6High
May7High
Jun7Very high
Jul8Very high
Aug8Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Gongju 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 Gongju is worst in March — around 92 µg/m³ PM2.5 (unhealthy), about 2.0× the cleanest month (July, 46 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyMar 1391 µg/m³Jul 2246 µg/m³
PM2.5 (µg/m³)Level
Jan83Unhealthy
Feb85Unhealthy
Mar92Unhealthy
Apr75Unhealthy
May62Unhealthy
Jun57Unhealthy
Jul46Poor
Aug47Poor
Sep61Unhealthy
Oct74Unhealthy
Nov79Unhealthy
Dec73Unhealthy
Location & terrain

Where is Gongju?

Gongju sits at 36.5°N, 127.1°E, 23 m above sea level, in South Korea. The nearest listed city is Sejong, 21 km away.

YesanYŏnmuAsanCheongju-si

Topography around Gongju

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

Within 3 km, the terrain around Gongju has significant variations in elevation — a maximum elevation change of 303 m around an average of 66 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 820 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,213 m.

The land around Gongju is covered by trees (53%) and artificial surfaces (22%) within 3 km, trees (68%) within 16 km, and trees (55%) and cropland (24%) within 80 km.

3 km
303 m
16 km
820 m
80 km
1,213 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Sejong 21 km · Daejeon 26 km · Buyeo 28 km · Nonsan 28 km · Yesan 35 km · Yŏnmu 36 km · Asan 38 km · Cheongju-si 38 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 Gongju (36.4556°, 127.1247°, elevation 23 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).