Seogwipo weather in September

In September, Seogwipo sees average daytime highs of 25°C and overnight lows near 21°C, with 183 mm of rain across 12.4 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 27°C in the first days to 24°C by the end. The sky is clear or mostly clear about 31% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Seogwipo's 4th-clearest and 7th-windiest month. For the whole year in context, see Seogwipo's year-round climate.

Daytime high
25°
3rd warmest
Overnight low
21°
10th coldest
Rainfall
183 mm
12.4 wet days
Daylight
12 h 12 min
6:22 AM – 6:34 PM
Cloud cover
60%
4th clearest
Wind
12 km/h
7th windiest
Solar energy
4.13 kWh/m²
Travel score
6.4
out of 10

Seogwipo is city in Jeju-do, South Korea.

Density
205/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 Seogwipo reaches about 25°C in the afternoon and slips back to 21°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 28°C. Set against its neighbours, September runs about 3°C cooler than August and about 5°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12723
22723
32723
42723
52723
62723
72723
82622
92622
102622
112622
122622
132622
142622
152521
162521
172521
182521
192521
202521
212521
222520
232420
242420
252420
262420
272420
282419
292319
302319

How September really feels in Seogwipo

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.

Seogwipo 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 / 568.32.3101.2
Feb / 607.91.510.81.7
Mar12° / 999.80.311.73.1
Apr16° / 11°1219012.85.1
May20° / 15°1329.3013.76.4
Jun24° / 19°22913014.26.1
Jul27° / 23°22715.90145.3
Aug28° / 25°22517.1013.24.8
Sep25° / 21°18312.4012.26.4
Oct21° / 16°866.5011.27.1
Nov16° / 11°657.8010.35.1
Dec10° / 558.11.29.82.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% 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 (%)
14258
24159
34159
44357
54357
64357
74456
84456
94456
104555
114555
124654
134753
144753
154753
164753
174753
184852
194951
204951
214951
225050
235050
245050
255149
265149
275149
285248
295248
305446

Chance of precipitation in September

Any precipitation

Seogwipo gets around 183 mm of rain over 12.4 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 41% and peaks near 51% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
151
250
349
448
547
647
746
846
946
1045
1145
1244
1344
1443
1542
1642
1741
1840
1939
2038
2137
2237
2336
2435
2534
2634
2733
2832
2931
3031

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 31% of days. Sticky, muggy-or-worse air turns up on roughly 59% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10010333918
20111343816
30112353715
40114363513
50215373412
60216383311
70317383210
8031938318
9042038307
10052138296
11162237295
12172337285
13192435274
142102534263
152122633253
162132632243
173152731232
183162730222
194182828202
204192928191
215212926181
226222926171
236232925161
247243024141
258253023131
269263022121
2710273021110
2812273020100
291328292090
301528291980

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

051015151015202530
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 42 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 60 minutes over September. Sunrise moves from 6:12 AM to 6:32 AM, and sunset from 6:55 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.76:126:55
212.76:126:54
312.76:136:52
412.66:146:51
512.66:156:50
612.66:156:48
712.56:166:47
812.56:176:45
912.46:176:44
1012.46:186:43
1112.46:196:41
1212.36:196:40
1312.36:206:38
1412.36:216:37
1512.26:216:36
1612.26:226:34
1712.26:236:33
1812.16:236:31
1912.16:246:30
2012.16:256:28
2112.06:256:27
2212.06:266:26
2312.06:276:24
2411.96:286:23
2511.96:286:21
2611.96:296:20
2711.86:306:19
2811.86:306:17
2911.76:316:16
3011.76:326:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.13 kWh/m².

For context, solar energy here swings from a low near 2.05 kWh/m² to a high of 5.69 kWh/m² in May across the year — September's 4.13 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.4Bright
54.4Bright
64.3Bright
74.3Bright
84.3Bright
94.3Bright
104.2Bright
114.2Bright
124.2Bright
134.2Bright
144.2Bright
154.1Bright
164.1Bright
174.1Bright
184.1Bright
194.1Bright
204.1Bright
214.1Bright
224.0Bright
234.0Bright
244.0Bright
254.0Bright
264.0Moderate
274.0Moderate
284.0Moderate
294.0Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Seogwipo

In seasonPeak

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

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

Seogwipo'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 Seogwipo?

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

6.4
Sightseeing
2nd-best month of the year
5.8
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Seogwipo for sightseeing.

What to pack for Seogwipo in September

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

In September, Seogwipo sees daytime highs around 25°C and nights near 21°C. Worth packing: light clothes and rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Seogwipo in September

The nearest coast averages about 26°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 15 km away) is warmest in August at about 27°C and coldest in March near 15°C.

It's comfortable for a long swim from Jun 6 to Dec 2 — about 5.9 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan17Cool
Feb15Cool
Mar15Cool
Apr16Cool
May18Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct24Refreshing
Nov22Refreshing
Dec19Cool

UV index in Seogwipo 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 Seogwipo peaks around July 17 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 17UV 9Dec 20UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7High
May9Very high
Jun8Very high
Jul10Very high
Aug8Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Seogwipo 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 Seogwipo is worst in March — around 28 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (July, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateMar 2128 µg/m³Jul 2312 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb23Moderate
Mar28Moderate
Apr27Moderate
May22Moderate
Jun17Moderate
Jul12Good
Aug12Moderate
Sep13Moderate
Oct13Moderate
Nov16Moderate
Dec15Moderate
Location & terrain

Where is Seogwipo?

Seogwipo sits at 33.3°N, 126.6°E, 69 m above sea level, in South Korea. The nearest listed city is Ara-dong, 24 km away.

Haenam

Topography around Seogwipo

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

Within 3 km, the terrain around Seogwipo has significant variations in elevation — a maximum elevation change of 287 m around an average of 80 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,921 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,905 m.

The land around Seogwipo is covered by trees (47%), artificial surfaces (26%) and water (24%) within 3 km, water (48%) and trees (44%) within 16 km, and water (85%) within 80 km.

3 km
287 m
16 km
1,921 m
80 km
1,905 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Ara-dong 24 km · Ora-dong 26 km · Seodong 26 km · Ido-dong 27 km · Tallang-dong 28 km · Jeju 29 km · Gaigeturi 33 km · Haenam 147 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 Seogwipo (33.2533°, 126.5618°, elevation 69 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).