Rangkasbitung weather in January

In January, Rangkasbitung sees average daytime highs of 29°C and overnight lows near 24°C, with 308 mm of rain across 29 wet days and about 12.3 hours of daylight. It is the 12th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 2% of the time in January, and the air most often feels oppressive.

Daylight stretches from about 12 h 24 min at the start of January to 12 h 18 min by month's end. Set against the rest of the year, January is Rangkasbitung's 10th-clearest and 2nd-windiest month. For the whole year in context, see Rangkasbitung's year-round climate.

Daytime high
29°
12th warmest
Overnight low
24°
7th coldest
Rainfall
308 mm
29 wet days
Daylight
12 h 18 min
5:54 AM – 6:14 PM
Cloud cover
89%
10th clearest
Wind
7 km/h
2nd windiest
Solar energy
4.53 kWh/m²
Travel score
2.9
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical January day in Rangkasbitung reaches about 29°C in the afternoon and slips back to 24°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 31°C. Set against its neighbours, January runs on par with December and on par with February.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12924
22924
32924
42924
52924
62924
72924
82924
92924
102924
112924
122924
132924
142924
152924
162924
172924
182924
192924
202924
212924
222924
232924
242924
252924
262924
272924
282924
292924
302924
312924

How January really feels in Rangkasbitung

Once humidity and wind are folded in, January averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Rangkasbitung weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 1st-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 January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 5% of January, with mostly cloudy or overcast conditions the remaining 93%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1892
2892
3892
4892
5892
6991
7991
8991
9991
10991
11991
12991
13991
14991
15991
16991
17991
18892
19793
20793
21793
22694
23595
24595
25595
26595
27496
28496
29496
30397
31397

Chance of precipitation in January

Any precipitation

Rangkasbitung gets around 308 mm of rain over 29 wet days in January, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 93% and peaks near 97% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202531
Rain chance (%)
190
290
390
490
590
690
790
890
990
1091
1191
1291
1392
1492
1593
1693
1794
1894
1995
2095
2196
2296
2396
2497
2597
2697
2797
2897
2997
3097
3197

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the oppressive band about 82% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
18317
28317
38317
48317
58317
68317
78317
88317
98317
108317
118317
128317
138317
148317
158317
168218
178218
188218
198218
208218
218218
228119
238119
248119
258119
268119
278119
288119
298119
308119
318020

Wind in January

Winds average 7 km/h in January.

Across January, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 12 h 24 min at the start of January to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over January. Sunrise moves from 5:47 AM to 6:00 AM, and sunset from 6:09 PM to 6:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:476:09
212.45:486:09
312.45:486:10
412.45:496:10
512.45:496:11
612.45:506:11
712.45:506:11
812.45:516:12
912.35:516:12
1012.35:526:12
1112.35:526:13
1212.35:536:13
1312.35:536:13
1412.35:536:14
1512.35:546:14
1612.35:546:14
1712.35:556:15
1812.35:556:15
1912.35:566:15
2012.35:566:15
2112.35:566:15
2212.35:576:16
2312.35:576:16
2412.35:586:16
2512.35:586:16
2612.35:586:16
2712.35:596:16
2812.35:596:16
2912.35:596:17
3012.36:006:17
3112.36:006:17

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 4.53 kWh/m².

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 — January's 4.53 kWh/m² sits near the bottom.

024151015202531
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.5Bright
134.5Bright
144.5Bright
154.5Bright
164.5Bright
174.5Bright
184.5Bright
194.5Bright
204.5Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
314.5Bright
Planning a trip in January

Hazard calendar for Rangkasbitung

In seasonPeak

In January, Rangkasbitung sits inside its cyclone and rainy season season. The full year is below, with each hazard's peak months called out.

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 January a good time to visit Rangkasbitung?

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

2.9
Sightseeing
7th-best month of the year
3.8
Beach & pool
10th-best month of the year

January is a weaker month for outdoor sightseeing in Rangkasbitung.

What to pack for Rangkasbitung in January

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

In January, Rangkasbitung sees daytime highs around 29°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 29 days see rain.

light clothesrain gearsun protection

Sea temperature near Rangkasbitung in January

The nearest coast averages about 29°C in January — 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 January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 14 (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 January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January 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
January 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).