Boryeong weather in September

In September, Boryeong sees average daytime highs of 24°C and overnight lows near 20°C, with 143 mm of rain across 8.1 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 22°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 Boryeong's 5th-clearest and 11th-windiest month. For the whole year in context, see Boryeong's year-round climate.

Daytime high
24°
3rd warmest
Overnight low
20°
10th coldest
Rainfall
143 mm
8.1 wet days
Daylight
12 h 12 min
6:21 AM – 6:35 PM
Cloud cover
52%
5th clearest
Wind
12 km/h
11th windiest
Solar energy
4.37 kWh/m²
Travel score
7.2
out of 10

Boryeong 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 26°C in the first days to 22°C by the end.

A typical September day in Boryeong reaches about 24°C in the afternoon and slips back to 20°C overnight — a 4°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
22622
32622
42622
52622
62622
72522
82522
92521
102521
112521
122521
132521
142521
152420
162420
172420
182420
192420
202420
212319
222319
232319
242319
252319
262318
272218
282218
292218
302218

How September really feels in Boryeong

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.

Boryeong weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°255.73.99.80.0
Feb / 314.61.510.60.1
Mar / 466.40.711.71.6
Apr13° / 827.4012.93.9
May18° / 14°886.9013.96.2
Jun22° / 19°1227.8014.46.9
Jul26° / 23°26314.3014.26.0
Aug27° / 24°22713.3013.45.9
Sep24° / 20°1438.1012.27.2
Oct19° / 15°595.1011.17.0
Nov12° / 497.10.310.13.7
Dec / 317.13.39.60.7

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 13% 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 (%)
14753
24852
34852
44951
54951
65050
75149
85149
95248
105149
115248
125248
135446
145446
155545
165545
175743
185743
195743
205842
215842
225842
235941
246040
256040
266040
276040
286040
296040
306040

Chance of precipitation in September

Any precipitation

Boryeong gets around 143 mm of rain over 8.1 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 28% and peaks near 40% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
140
239
338
437
536
635
734
833
932
1031
1130
1229
1329
1428
1527
1626
1725
1824
1923
2023
2122
2222
2322
2421
2521
2621
2721
2820
2920
3019

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 33% of days. Sticky, muggy-or-worse air turns up on roughly 47% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1021540349
2021741327
3031842306
4131944286
5142045265
6152145244
7162246223
8172346212
9282345192
102102445171
113112544161
123132643141
134142741131
144162839121
155172938110
166193036100
17620313490
18722323280
19823323070
20924332860
211025342650
221126342440
231327352240
241428352030
251628351820
261829351720
272029341610
282230331410
292430321310
302730311210

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

051015151015202530
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light 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 6:09 AM to 6:33 AM, and sunset from 6:58 PM to 6:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:096:58
212.86:106:56
312.76:116:55
412.76:116:53
512.76:126:52
612.66:136:50
712.66:146:49
812.56:156:47
912.56:156:46
1012.56:166:44
1112.46:176:43
1212.46:186:41
1312.36:196:39
1412.36:196:38
1512.36:206:36
1612.26:216:35
1712.26:226:33
1812.16:236:32
1912.16:246:30
2012.16:246:29
2112.06:256:27
2212.06:266:25
2312.06:276:24
2411.96:286:22
2511.96:286:21
2611.86:296:19
2711.86:306:18
2811.86:316:16
2911.76:326:15
3011.76:336:13

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.37 kWh/m².

For context, solar energy here swings from a low near 2.15 kWh/m² to a high of 5.89 kWh/m² in May across the year — September's 4.37 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.4Bright
54.4Bright
64.4Bright
74.4Bright
84.4Bright
94.4Bright
104.4Bright
114.4Bright
124.4Bright
134.4Bright
144.4Bright
154.4Bright
164.4Bright
174.4Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.2Bright
264.2Bright
274.2Bright
284.2Bright
294.2Bright
304.1Bright
Planning a trip in September

Hazard calendar for Boryeong

In seasonPeak

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

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

Boryeong'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 Boryeong?

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

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

What to pack for Boryeong in September

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

In September, Boryeong sees daytime highs around 24°C and nights near 20°C. Worth packing: light clothes and rain gear. About 8 days see rain.

light clothesrain gear

Sea temperature near Boryeong 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 20 km away) is warmest in August at about 25°C and coldest in February near 5°C.

It's comfortable for a long swim from Jun 30 to Oct 7 — about 3.3 months when the water holds above 20°C.

0°10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan7Bracing
Feb5Bracing
Mar6Bracing
Apr9Bracing
May13Bracing
Jun18Cool
Jul22Refreshing
Aug25Warm
Sep23Refreshing
Oct19Cool
Nov15Bracing
Dec11Bracing

UV index in Boryeong in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Boryeong peaks around September 10 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateSep 10UV 7Dec 22UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5Moderate
Apr6High
May6High
Jun7High
Jul7Very high
Aug7Very high
Sep7Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Boryeong 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 Boryeong is worst in March — around 64 µg/m³ PM2.5 (unhealthy), about 2.0× the cleanest month (July, 32 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyPoorModeratePoorMar 1663 µg/m³Jul 2133 µg/m³
PM2.5 (µg/m³)Level
Jan52Poor
Feb56Unhealthy
Mar64Unhealthy
Apr55Poor
May46Poor
Jun42Poor
Jul32Moderate
Aug35Moderate
Sep43Poor
Oct48Poor
Nov51Poor
Dec48Poor
Location & terrain

Where is Boryeong?

Boryeong sits at 36.3°N, 126.6°E, 11 m above sea level, in South Korea. The nearest listed city is Hongseong, 29 km away.

GunsanYesanNonsanGongjuSeosanYŏnmu

Topography around Boryeong

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

Within 3 km, the terrain around Boryeong has significant variations in elevation — a maximum elevation change of 311 m around an average of 44 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 780 m; within 80 km, large variations in elevation — a maximum elevation change of 847 m.

The land around Boryeong is covered by trees (34%), cropland (33%) and artificial surfaces (26%) within 3 km, trees (50%) and water (24%) within 16 km, and water (43%), trees (30%) and cropland (20%) within 80 km.

3 km
311 m
16 km
780 m
80 km
847 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Hongseong 29 km · Buyeo 29 km · Gunsan 42 km · Yesan 43 km · Nonsan 47 km · Gongju 49 km · Seosan 50 km · Yŏnmu 51 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 Boryeong (36.3493°, 126.5977°, elevation 11 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).