Goseong weather in September

In September, Goseong sees average daytime highs of 26°C and overnight lows near 20°C, with 156 mm of rain across 9.1 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 33% 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 Goseong's 9th-clearest and 5th-windiest month. For the whole year in context, see Goseong's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
20°
10th coldest
Rainfall
156 mm
9.1 wet days
Daylight
12 h 12 min
6:15 AM – 6:28 PM
Cloud cover
59%
9th clearest
Wind
10 km/h
5th windiest
Solar energy
4.28 kWh/m²
Travel score
6.8
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 Goseong reaches about 26°C in the afternoon and slips back to 20°C overnight — a 6°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)
12823
22822
32822
42722
52722
62722
72722
82721
92721
102721
112721
122621
132621
142620
152620
162620
172620
182620
192519
202519
212519
222519
232519
242519
252518
262418
272418
282418
292418
302417

How September really feels in Goseong

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.

Goseong 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 / -2°273.60.69.90.8
Feb / 374.50.510.71.8
Mar13° / 726.90.311.73.8
Apr18° / 11°1048012.96.1
May22° / 16°1107.4013.87.0
Jun25° / 20°1579.1014.36.7
Jul28° / 24°23013.7014.15.3
Aug29° / 24°20214.3013.34.8
Sep26° / 20°1569.1012.26.8
Oct21° / 14°644.4011.17.6
Nov15° / 444.9010.25.2
Dec / 253.30.19.72.0

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 14% of September, with mostly cloudy or overcast conditions the remaining 53%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24159
34258
44258
54357
64258
74258
84357
94357
104456
114456
124456
134555
144654
154654
164654
174753
184753
194852
204951
214951
225050
235050
245050
255050
265149
275248
285347
295347
305347

Chance of precipitation in September

Any precipitation

Goseong gets around 156 mm of rain over 9.1 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 30% 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
835
934
1034
1133
1232
1331
1431
1530
1629
1729
1828
1927
2027
2126
2226
2326
2425
2525
2624
2724
2823
2923
3022

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 32% of days. Sticky, muggy-or-worse air turns up on roughly 53% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10112393216
20113403114
30214413013
40215422912
51316422810
6141743279
7151743268
8161843257
9171943246
10182142235
11292241224
122102340214
133122439203
143132537193
154152635182
164162834172
175172932152
186193031141
196203129131
207213127121
218233226101
22924322591
231025332381
241226332271
251327332061
261528331960
271628321850
281829311740
292029301640
302330291530

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
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 6:03 AM to 6:25 AM, and sunset from 6:50 PM to 6:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:036:50
212.76:046:48
312.76:056:47
412.76:066:45
512.66:066:44
612.66:076:42
712.66:086:41
812.56:096:39
912.56:096:38
1012.46:106:36
1112.46:116:35
1212.46:126:33
1312.36:126:32
1412.36:136:31
1512.36:146:29
1612.26:156:28
1712.26:156:26
1812.16:166:25
1912.16:176:23
2012.16:186:22
2112.06:186:20
2212.06:196:19
2312.06:206:17
2411.96:216:16
2511.96:216:14
2611.86:226:13
2711.86:236:11
2811.86:246:10
2911.76:256:08
3011.76:256:07

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.28 kWh/m².

For context, solar energy here swings from a low near 2.7 kWh/m² to a high of 5.87 kWh/m² in May across the year — September's 4.28 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.4Bright
54.4Bright
64.4Bright
74.4Bright
84.4Bright
94.3Bright
104.3Bright
114.3Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.2Bright
264.2Bright
274.2Bright
284.2Bright
294.2Bright
304.1Bright
Planning a trip in September

Hazard calendar for Goseong

In seasonPeak

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

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

Goseong'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 Goseong?

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
1st-best month of the year

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

What to pack for Goseong in September

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

In September, Goseong sees daytime highs around 26°C and nights near 20°C. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

Sea temperature near Goseong 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 39 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 18 to Oct 29 — about 4.4 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr14Bracing
May16Cool
Jun20Cool
Jul23Refreshing
Aug26Warm
Sep24Warm
Oct21Refreshing
Nov18Cool
Dec16Cool

UV index in Goseong 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 Goseong peaks around August 19 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 highModerateAug 19UV 9Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun8Very high
Jul8Very high
Aug9Very high
Sep9Very high
Oct5High
Nov4Moderate
Dec2Moderate

Air quality in Goseong 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 Goseong is worst in March — around 51 µg/m³ PM2.5 (poor), about 1.8× the cleanest month (August, 29 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorMar 2051 µg/m³Aug 1029 µg/m³
PM2.5 (µg/m³)Level
Jan38Poor
Feb43Poor
Mar51Poor
Apr49Poor
May43Poor
Jun38Poor
Jul29Moderate
Aug29Moderate
Sep33Moderate
Oct36Poor
Nov40Poor
Dec35Moderate
Location & terrain

Where is Goseong?

Goseong sits at 35.0°N, 128.3°E, 14 m above sea level, in South Korea. The nearest listed city is Tongyeong, 17 km away.

NaesŏGeojeChangwonHadong

Topography around Goseong

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

Within 3 km, the terrain around Goseong has only modest variations in elevation — a maximum elevation change of 171 m around an average of 25 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 639 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,875 m.

The land around Goseong is covered by cropland (39%) and trees (31%) within 3 km, trees (55%) and water (28%) within 16 km, and water (44%) and trees (43%) within 80 km.

3 km
171 m
16 km
639 m
80 km
1,875 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Tongyeong 17 km · Kyosai 28 km · Sinhyeon 30 km · Chinju 32 km · Naesŏ 35 km · Geoje 39 km · Changwon 43 km · Hadong 53 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 Goseong (34.9763°, 128.3236°, elevation 14 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).