Sinan weather in September

In September, Sinan sees average daytime highs of 23°C and overnight lows near 21°C, with 161 mm of rain across 7.7 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 24°C in the first days to 21°C by the end. The sky is clear or mostly clear about 42% 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 Sinan's 2nd-clearest and 10th-windiest month. For the whole year in context, see Sinan's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
21°
10th coldest
Rainfall
161 mm
7.7 wet days
Daylight
12 h 12 min
6:23 AM – 6:36 PM
Cloud cover
52%
2nd clearest
Wind
18 km/h
10th windiest
Solar energy
4.48 kWh/m²
Travel score
7.2
out of 10

Sinan is human settlement in South Korea.

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 24°C in the first days to 21°C by the end.

A typical September day in Sinan reaches about 23°C in the afternoon and slips back to 21°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 24°C. Set against its neighbours, September runs about 3°C cooler than August and about 4°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12423
22423
32423
42423
52422
62422
72422
82422
92422
102322
112322
122322
132322
142321
152321
162321
172321
182321
192221
202221
212221
222220
232220
242220
252220
262220
272120
282120
292119
302119

How September really feels in Sinan

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.

Sinan 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 / 407.52.89.90.4
Feb / 456.61.810.70.4
Mar / 717.30.411.71.5
Apr11° / 10°917.6012.83.1
May15° / 14°1037.8013.85.1
Jun19° / 18°1718.7014.36.1
Jul23° / 22°21511.6014.16.4
Aug25° / 24°20411.3013.36.7
Sep23° / 21°1617.7012.27.2
Oct19° / 17°614.6011.17.0
Nov14° / 11°586.9010.24.2
Dec / 448.11.79.71.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% 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 45%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15050
25149
35149
45248
55248
65347
75347
85347
95446
105446
115545
125545
135644
145644
155644
165743
175644
185743
195743
205743
215842
225743
235743
245743
255842
265842
275842
285842
295842
305941

Chance of precipitation in September

Any precipitation

Sinan gets around 161 mm of rain over 7.7 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 27% 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
335
434
534
633
732
831
931
1030
1129
1228
1328
1427
1526
1625
1724
1823
1923
2022
2121
2221
2321
2421
2521
2621
2721
2820
2920
3020

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 56% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1019354410
2011037439
3011139427
4021239406
5121340385
6131541374
7131642353
8141743332
9141943312
10152143291
11262242271
12272441260
13282641240
14392740220
153102939200
164113037180
174123136160
185133335140
195143434120
206153533110
21716363190
22817373080
23918382970
241019382760
251120382650
261321382540
271522382330
281622372220
291823372120
302023361910

Wind in September

Winds average 18 km/h in September.

Across September, daily wind ranges from about 17 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2619light breeze
2719light breeze
2819light breeze
2920light breeze
3020light 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 6:12 AM to 6:34 AM, and sunset from 6:58 PM to 6:16 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:126:58
212.76:136:57
312.76:146:55
412.76:156:54
512.66:156:53
612.66:166:51
712.56:176:50
812.56:176:48
912.56:186:47
1012.46:196:45
1112.46:206:44
1212.46:206:42
1312.36:216:41
1412.36:226:39
1512.36:236:38
1612.26:236:36
1712.26:246:35
1812.16:256:33
1912.16:266:32
2012.16:266:30
2112.06:276:29
2212.06:286:27
2312.06:296:26
2411.96:296:24
2511.96:306:23
2611.86:316:21
2711.86:326:20
2811.86:336:19
2911.76:336:17
3011.76:346:16

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.48 kWh/m².

For context, solar energy here swings from a low near 2.11 kWh/m² to a high of 5.9 kWh/m² in May across the year — September's 4.48 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.7Bright
54.6Bright
64.6Bright
74.6Bright
84.6Bright
94.6Bright
104.6Bright
114.5Bright
124.5Bright
134.5Bright
144.5Bright
154.5Bright
164.5Bright
174.5Bright
184.4Bright
194.4Bright
204.4Bright
214.4Bright
224.4Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.2Bright
304.2Bright
Planning a trip in September

Hazard calendar for Sinan

In seasonPeak

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

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

Sinan'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 Sinan?

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

7.2
Sightseeing
1st-best month of the year
5.4
Beach & pool
2nd-best month of the year

September is one of the better times to visit Sinan for general sightseeing.

What to pack for Sinan in September

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

In September, Sinan sees daytime highs around 23°C and nights near 21°C. Worth packing: light clothes. About 8 days see rain.

light clothes

Sea temperature near Sinan 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 22 km away) is warmest in August at about 25°C and coldest in February near 7°C.

It's comfortable for a long swim from Jun 30 to Oct 6 — about 3.3 months when the water holds above 20°C.

10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan9Bracing
Feb7Bracing
Mar8Bracing
Apr10Bracing
May14Bracing
Jun18Cool
Jul22Refreshing
Aug25Warm
Sep23Refreshing
Oct19Cool
Nov15Cool
Dec12Bracing

UV index in Sinan 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 Sinan peaks around June 22 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 highHighModerateJun 22UV 8Dec 22UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar6High
Apr6High
May7Very high
Jun8Very high
Jul8Very high
Aug8Very high
Sep8Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Sinan 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 Sinan is worst in March — around 33 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (August, 13 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 1732 µg/m³Aug 1113 µg/m³
PM2.5 (µg/m³)Level
Jan25Moderate
Feb29Moderate
Mar33Moderate
Apr29Moderate
May23Moderate
Jun17Moderate
Jul14Moderate
Aug13Moderate
Sep17Moderate
Oct18Moderate
Nov21Moderate
Dec20Moderate
Location & terrain

Where is Sinan?

Sinan sits at 34.8°N, 126.1°E, 3 m above sea level, in South Korea. The nearest listed city is Mokpo, 26 km away.

MuanHaenamYeongamNajuYeonggwangMasanJangheung

Topography around Sinan

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

Within 3 km, the terrain around Sinan has significant variations in elevation — a maximum elevation change of 337 m around an average of 38 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 346 m; within 80 km, large variations in elevation — a maximum elevation change of 768 m.

The land around Sinan is covered by trees (41%) and water (32%) within 3 km, water (75%) within 16 km, and water (66%) within 80 km.

3 km
337 m
16 km
346 m
80 km
768 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Mokpo 26 km · Muan 38 km · Haenam 53 km · Yeongam 54 km · Naju 60 km · Yeonggwang 62 km · Masan 74 km · Jangheung 75 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 Sinan (34.8262°, 126.1086°, elevation 3 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).