Haenam weather in September

In September, Haenam sees average daytime highs of 24°C and overnight lows near 21°C, with 140 mm of rain across 8.5 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 26°C in the first days to 23°C by the end. The sky is clear or mostly clear about 39% 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 Haenam's 4th-clearest and 11th-windiest month. For the whole year in context, see Haenam's year-round climate.

Daytime high
24°
3rd warmest
Overnight low
21°
10th coldest
Rainfall
140 mm
8.5 wet days
Daylight
12 h 12 min
6:22 AM – 6:34 PM
Cloud cover
54%
4th clearest
Wind
14 km/h
11th windiest
Solar energy
4.41 kWh/m²
Travel score
7.1
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 26°C in the first days to 23°C by the end.

A typical September day in Haenam reaches about 24°C in the afternoon and slips back to 21°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 26°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)
12623
22623
32623
42623
52623
62523
72522
82522
92522
102522
112522
122522
132522
142521
152421
162421
172421
182421
192421
202420
212420
222420
232320
242320
252320
262320
272319
282319
292219
302219

How September really feels in Haenam

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.

Haenam 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 / 376.72.59.90.4
Feb / 426.21.510.70.9
Mar10° / 737.50.411.72.4
Apr14° / 10°947.9012.84.4
May18° / 15°1047.6013.86.2
Jun22° / 19°1729.6014.36.4
Jul26° / 23°22312.3014.16.2
Aug27° / 25°18211.6013.36.3
Sep24° / 21°1408.5012.27.1
Oct20° / 16°574.7011.17.2
Nov14° / 10°506.6010.24.5
Dec / 376.41.39.71.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% 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 47%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14753
24753
34753
44852
54852
64951
74951
85050
95050
105149
115149
125149
135248
145248
155248
165347
175347
185446
195545
205545
215545
225545
235644
245644
255644
265644
275644
285743
295743
305842

Chance of precipitation in September

Any precipitation

Haenam gets around 140 mm of rain over 8.5 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 37% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
137
236
336
435
535
634
734
833
933
1032
1132
1231
1331
1430
1529
1629
1728
1827
1926
2026
2125
2224
2324
2423
2523
2623
2722
2822
2921
3021

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 34% of days. Sticky, muggy-or-worse air turns up on roughly 58% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1018374014
2019393813
30110403711
4021142369
5021243358
6021343347
7131543326
8131644325
9141843304
10141943293
11152142282
12262341272
13272540252
14282738241
15392837221
163103035211
174113134191
184133332171
195143431151
206153530141
216163728121
227173727111
23818382691
24919392581
251020392471
261221392360
271322382150
281523382040
291723371930
301924371830

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 14 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze

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 6:11 AM to 6:32 AM, and sunset from 6:56 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:116:56
212.76:116:55
312.76:126:53
412.76:136:52
512.66:136:50
612.66:146:49
712.56:156:48
812.56:166:46
912.56:166:45
1012.46:176:43
1112.46:186:42
1212.46:196:40
1312.36:196:39
1412.36:206:37
1512.26:216:36
1612.26:226:34
1712.26:226:33
1812.16:236:31
1912.16:246:30
2012.16:246:28
2112.06:256:27
2212.06:266:25
2312.06:276:24
2411.96:276:22
2511.96:286:21
2611.86:296:20
2711.86:306:18
2811.86:316:17
2911.76:316:15
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 4.41 kWh/m².

For context, solar energy here swings from a low near 2.24 kWh/m² to a high of 5.85 kWh/m² in May across the year — September's 4.41 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.5Bright
134.4Bright
144.4Bright
154.4Bright
164.4Bright
174.4Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.2Bright
284.2Bright
294.2Bright
304.2Bright
Planning a trip in September

Hazard calendar for Haenam

In seasonPeak

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

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

Haenam's rainy season runs May–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 Haenam?

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

7.1
Sightseeing
2nd-best month of the year
6.0
Beach & pool
2nd-best month of the year

September is one of the better times to visit Haenam for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Haenam in September

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

In September, Haenam sees daytime highs around 24°C and nights near 21°C. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

Sea temperature near Haenam 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 30 km away) is warmest in August at about 25°C and coldest in March near 11°C.

It's comfortable for a long swim from Jun 28 to Oct 14 — about 3.6 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb11Bracing
Mar11Bracing
Apr12Bracing
May15Bracing
Jun18Cool
Jul22Refreshing
Aug25Warm
Sep23Refreshing
Oct20Cool
Nov16Cool
Dec14Bracing

UV index in Haenam 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 Haenam peaks around August 14 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 22UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun8Very high
Jul8Very high
Aug9Very high
Sep8Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Haenam 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 Haenam is worst in March — around 43 µg/m³ PM2.5 (poor), about 2.4× the cleanest month (July, 18 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateMar 1842 µg/m³Jul 2418 µg/m³
PM2.5 (µg/m³)Level
Jan31Moderate
Feb36Poor
Mar43Poor
Apr37Poor
May30Moderate
Jun25Moderate
Jul18Moderate
Aug18Moderate
Sep22Moderate
Oct24Moderate
Nov27Moderate
Dec26Moderate
Location & terrain

Where is Haenam?

Haenam sits at 34.6°N, 126.6°E, 39 m above sea level, in South Korea. The nearest listed city is Yeongam, 27 km away.

MuanBoseongNajuSinanHwasun

Topography around Haenam

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

Within 3 km, the terrain around Haenam has significant variations in elevation — a maximum elevation change of 462 m around an average of 123 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 666 m; within 80 km, large variations in elevation — a maximum elevation change of 1,172 m.

The land around Haenam is covered by trees (59%) and cropland (24%) within 3 km, trees (48%) and cropland (40%) within 16 km, and water (57%) and trees (27%) within 80 km.

3 km
462 m
16 km
666 m
80 km
1,172 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Yeongam 27 km · Jangheung 31 km · Mokpo 33 km · Muan 48 km · Boseong 49 km · Naju 52 km · Sinan 53 km · Hwasun 65 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 Haenam (34.5711°, 126.5989°, elevation 39 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).