Rangkasbitung weather in September

In September, Rangkasbitung sees average daytime highs of 31°C and overnight lows near 23°C, with 74 mm of rain across 13.9 wet days and about 12 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 14% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Rangkasbitung's 4th-clearest and 8th-windiest month. For the whole year in context, see Rangkasbitung's year-round climate.

Daytime high
31°
2nd warmest
Overnight low
23°
3rd coldest
Rainfall
74 mm
13.9 wet days
Daylight
12 hours
5:50 AM – 5:48 PM
Cloud cover
66%
4th clearest
Wind
4 km/h
8th windiest
Solar energy
5.81 kWh/m²
Travel score
3.8
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical September day in Rangkasbitung reaches about 31°C in the afternoon and slips back to 23°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 33°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13123
23123
33123
43123
53123
63123
73123
83123
93123
103123
113123
123123
133123
143123
153123
163123
173123
183123
193123
203223
213223
223223
233223
243223
253223
263223
273223
283223
293223
303223

How September really feels in Rangkasbitung

Once humidity and wind are folded in, September averages 30 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
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Rangkasbitung weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 24°3082912.32.9
Feb30° / 24°2852712.22.7
Mar30° / 24°27228.8122.7
Apr31° / 24°22626.811.92.7
May31° / 24°15223.111.73.2
Jun31° / 23°10317.611.63.8
Jul30° / 23°7414.111.74.3
Aug31° / 23°6013.111.84.3
Sep31° / 23°7413.9123.8
Oct31° / 24°14421.412.13.1
Nov31° / 24°24126.312.32.7
Dec30° / 24°30027.512.42.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 27% of September, with mostly cloudy or overcast conditions the remaining 59%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14555
24555
34555
44456
54456
64555
74555
84456
94456
104456
114258
124258
134258
144159
154060
164060
174060
183961
193961
203862
213862
223961
233862
243862
253862
263763
273763
283763
293565
303565

Chance of precipitation in September

Any precipitation

Rangkasbitung gets around 74 mm of rain over 13.9 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 47% and peaks near 57% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
147
247
346
446
546
645
745
844
944
1044
1144
1243
1343
1443
1544
1644
1744
1845
1945
2046
2147
2248
2349
2450
2551
2652
2753
2854
2955
3057

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the oppressive band about 83% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
114842
214842
314842
414842
515832
615832
716822
816822
916822
1016831
1116831
1216831
1316831
1416831
1516831
1616822
1716822
1815832
1915832
2015832
2114842
2214842
2314833
2413843
2513843
2613843
2713843
2812853
2912853
3012844

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over September. Sunrise moves from 5:58 AM to 5:43 AM, and sunset from 5:51 PM to 5:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:585:51
211.95:585:51
311.95:575:51
411.95:575:51
511.95:565:50
611.95:565:50
711.95:555:50
811.95:555:50
911.95:545:50
1011.95:545:49
1111.95:535:49
1211.95:535:49
1311.95:525:49
1412.05:515:49
1512.05:515:48
1612.05:505:48
1712.05:505:48
1812.05:495:48
1912.05:495:48
2012.05:485:48
2112.05:485:47
2212.05:475:47
2312.05:475:47
2412.05:465:47
2512.05:455:47
2612.05:455:46
2712.05:445:46
2812.05:445:46
2912.05:435:46
3012.05:435:46

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.81 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.41 kWh/m² to a high of 5.81 kWh/m² in September across the year — September's 5.81 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.7Bright
85.8Bright
95.8Bright
105.8Bright
115.8Bright
125.8Bright
135.8Bright
145.8Bright
155.8Bright
165.8Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
Planning a trip in September

Hazard calendar for Rangkasbitung

In seasonPeak

None of Rangkasbitung's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Rangkasbitung sits in the South Indian Ocean cyclone belt; the season peaks January–March.

Rangkasbitung's rainy season runs October–May, when most of the year's rain falls.

Cyclone
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Rangkasbitung?

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

3.8
Sightseeing
3rd-best month of the year
5.8
Beach & pool
3rd-best month of the year

September is a weaker month for outdoor sightseeing in Rangkasbitung.

What to pack for Rangkasbitung in September

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

In September, Rangkasbitung sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 14 days see rain.

light clothesrain gearsun protection

Sea temperature near Rangkasbitung in September

The nearest coast averages about 29°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 41 km away) is warmest in May at about 30°C and coldest in January near 29°C.

The water stays above 20°C all year — warm enough for a swim any month.

28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May30Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Rangkasbitung in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Rangkasbitung peaks around March 13 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 15 at about 7 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highVery highMar 13UV 15Nov 15UV 7
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar16Extreme
Apr11Extreme
May9Very high
Jun8Very high
Jul8Very high
Aug10Very high
Sep10Very high
Oct10Extreme
Nov6High
Dec11Extreme

Air quality in Rangkasbitung 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 Rangkasbitung is worst in May — around 74 µg/m³ PM2.5 (unhealthy), about 1.9× the cleanest month (December, 38 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyPoorMay 2073 µg/m³Dec 2438 µg/m³
PM2.5 (µg/m³)Level
Jan39Poor
Feb41Poor
Mar51Poor
Apr62Unhealthy
May74Unhealthy
Jun69Unhealthy
Jul67Unhealthy
Aug67Unhealthy
Sep70Unhealthy
Oct69Unhealthy
Nov61Unhealthy
Dec38Poor
Location & terrain

Where is Rangkasbitung?

Rangkasbitung sits at 6.4°S, 106.2°E, 27 m above sea level, in Indonesia. The nearest listed city is Pandeglang, 17 km away.

Topography around Rangkasbitung

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

Within 3 km, the terrain around Rangkasbitung has only modest variations in elevation — a maximum elevation change of 55 m around an average of 31 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 248 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,145 m.

The land around Rangkasbitung is covered by trees (54%) and artificial surfaces (26%) within 3 km, trees (75%) within 16 km, and trees (44%) and water (38%) within 80 km.

3 km
55 m
16 km
248 m
80 km
2,145 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Pandeglang 17 km · Serang 29 km · Kresek 29 km · Cikupa 32 km · Curug 35 km · Pasarkemis 37 km · Cilegon 44 km · Sepatan 45 km

Indonesia travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,060
2025
Happiness
5.6 / 10
World Happiness, 2025
Safe drinking water
30%
of population, 2024
Homicide rate
0.3
per 100k, 2022
Road deaths
11.3
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 471
Religion
Muslim 87%Protestant 8%Roman Catholic 3%Hindu 2%

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 Rangkasbitung (-6.3591°, 106.2494°, elevation 27 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).