Cilacap weather in January

In January, Cilacap sees average daytime highs of 28°C and overnight lows near 26°C, with 316 mm of rain across 28.2 wet days and about 12.4 hours of daylight. It is the 5th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 4% 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 Cilacap's 10th-clearest and 7th-windiest month. For the whole year in context, see Cilacap's year-round climate.

Daytime high
28°
5th warmest
Overnight low
26°
9th coldest
Rainfall
316 mm
28.2 wet days
Daylight
12 h 24 min
5:41 AM – 6:05 PM
Cloud cover
86%
10th clearest
Wind
11 km/h
7th windiest
Solar energy
4.87 kWh/m²
Travel score
3.6
out of 10

Cilacap is capital of Cilacap Regency.

Founded
1982

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical January day in Cilacap reaches about 28°C in the afternoon and slips back to 26°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 29°C. Set against its neighbours, January runs on par with December and on par with February.

24°26°28°30°32°151015202531
Avg high (°C)Avg low (°C)
12826
22826
32826
42826
52826
62826
72826
82826
92826
102826
112826
122826
132826
142826
152826
162826
172826
182826
192826
202826
212826
222826
232826
242826
252826
262826
272826
282826
292826
302826
312826

How January really feels in Cilacap

Once humidity and wind are folded in, January 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

January sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Cilacap weather by month

How January compares with the rest of the year at a glance. January is the 5th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 26°31628.212.43.6
Feb28° / 26°2402512.33.6
Mar28° / 26°25927.912.13.4
Apr28° / 26°2062711.83.4
May28° / 26°1622511.74.0
Jun28° / 25°12721.411.64.8
Jul27° / 25°10117.711.65.5
Aug26° / 24°7215.311.76.0
Sep26° / 24°11017.9125.4
Oct27° / 25°22123.412.24.6
Nov27° / 25°36527.512.43.6
Dec28° / 26°39428.112.43.5

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 4% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 9% of January, with mostly cloudy or overcast conditions the remaining 87%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11585
21585
31585
41585
51684
61684
71684
81684
91684
101684
111684
121684
131585
141585
151585
161585
171387
181387
191387
201387
211189
221189
231189
24991
25991
26991
27991
28991
29991
30892
31892

Chance of precipitation in January

Any precipitation

Cilacap gets around 316 mm of rain over 28.2 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 91% and peaks near 91% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
190
291
391
491
591
691
791
891
991
1091
1191
1291
1391
1491
1591
1691
1791
1891
1991
2091
2191
2291
2391
2491
2590
2690
2791
2891
2991
3091
3191

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 83% 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
228317
238317
248317
258317
268317
278317
288317
298317
308317
318317

Wind in January

Winds average 11 km/h in January.

Across January, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3012calm
3112calm

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 5:34 AM to 5:47 AM, and sunset from 6:00 PM to 6:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:346:00
212.45:346:01
312.45:356:01
412.45:356:02
512.45:366:02
612.45:366:02
712.45:376:03
812.45:376:03
912.45:386:03
1012.45:386:04
1112.45:396:04
1212.45:396:04
1312.45:406:05
1412.45:406:05
1512.45:416:05
1612.45:416:05
1712.45:426:06
1812.45:426:06
1912.45:426:06
2012.45:436:06
2112.45:436:06
2212.45:446:07
2312.45:446:07
2412.45:456:07
2512.45:456:07
2612.45:456:07
2712.45:466:07
2812.45:466:07
2912.35:466:07
3012.35:476:07
3112.35:476:07

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 4.87 kWh/m².

For context, solar energy here swings from a low near 4.58 kWh/m² to a high of 5.61 kWh/m² in September across the year — January's 4.87 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
314.8Bright
Planning a trip in January

Hazard calendar for Cilacap

In seasonPeak

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

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

Cilacap's rainy season runs October–April, 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 Cilacap?

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

3.6
Sightseeing
7th-best month of the year
3.9
Beach & pool
10th-best month of the year

January is a weaker month for outdoor sightseeing in Cilacap.

What to pack for Cilacap in January

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

In January, Cilacap sees daytime highs around 28°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 28 days see rain.

light clothesrain gearsun protection

Sea temperature near Cilacap 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 21 km away) is warmest in April at about 29°C and coldest in August near 26°C.

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

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May29Tropical
Jun28Warm
Jul27Warm
Aug26Warm
Sep26Warm
Oct27Warm
Nov28Warm
Dec29Tropical

UV index in Cilacap 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 Cilacap peaks around March 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 14 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeExtremeMar 12UV 15Jun 14UV 7
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar15Extreme
Apr12Extreme
May9Very high
Jun7High
Jul10Very high
Aug11Extreme
Sep12Extreme
Oct13Extreme
Nov9Very high
Dec12Extreme

Air quality in Cilacap 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 Cilacap is worst in May — around 46 µg/m³ PM2.5 (poor), and holds fairly steady the rest of the year.

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateMay 1545 µg/m³Sep 1630 µg/m³
PM2.5 (µg/m³)Level
Jan39Poor
Feb39Poor
Mar41Poor
Apr44Poor
May46Poor
Jun43Poor
Jul37Poor
Aug31Moderate
Sep30Moderate
Oct31Moderate
Nov32Moderate
Dec33Moderate
Location & terrain

Where is Cilacap?

Cilacap sits at 7.7°S, 109.0°E, 10 m above sea level, in Indonesia. The nearest listed city is Wangon, 24 km away.

Topography around Cilacap

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

Within 3 km, the terrain around Cilacap has only modest variations in elevation — a maximum elevation change of 123 m around an average of 6 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 209 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,396 m.

The land around Cilacap is covered by artificial surfaces (42%) and water (36%) within 3 km, water (51%) and trees (24%) within 16 km, and trees (49%) and water (35%) within 80 km.

3 km
123 m
16 km
209 m
80 km
3,396 m
treesgrasslandcroplandartificial surfaceswatermangroves
January weather nearby: Wangon 24 km · Kroya 28 km · Sidareja 36 km · Banyumas 39 km · Purwokerto 42 km · Sokaraja 43 km · Baturaden 53 km · Purbalingga 54 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 Cilacap (-7.7264°, 109.0094°, elevation 10 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).