Cepu weather in December

In December, Cepu sees average daytime highs of 32°C and overnight lows near 24°C, with 332 mm of rain across 27.7 wet days and about 12.4 hours of daylight. It is the 8th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 1% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 24 min at the start of December to 12 h 24 min by month's end. Set against the rest of the year, December is Cepu's 11th-clearest and 8th-windiest month. For the whole year in context, see Cepu's year-round climate.

Daytime high
32°
8th warmest
Overnight low
24°
9th coldest
Rainfall
332 mm
27.7 wet days
Daylight
12 h 24 min
5:17 AM – 5:42 PM
Cloud cover
89%
11th clearest
Wind
5 km/h
8th windiest
Solar energy
4.99 kWh/m²
Travel score
2.3
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 32°C through the month.

A typical December day in Cepu reaches about 32°C in the afternoon and slips back to 24°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 34°C. Set against its neighbours, December runs about 1°C cooler than November and on par with January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13224
23224
33224
43224
53224
63224
73224
83224
93224
103224
113224
123224
133224
143224
153224
163224
173224
183224
193224
203224
213224
223224
233224
243224
253224
263224
273124
283124
293124
303124
313124

How December really feels in Cepu

Once humidity and wind are folded in, December 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 December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Cepu weather by month

How December compares with the rest of the year at a glance. December is the 8th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 24°32028.712.42.4
Feb31° / 24°31726.912.22.3
Mar32° / 24°31728.6122.3
Apr32° / 24°23324.911.82.6
May32° / 24°10815.711.73.5
Jun32° / 23°609.611.63.9
Jul32° / 23°315.111.64.2
Aug33° / 22°132.611.84.2
Sep34° / 23°304.5123.5
Oct34° / 24°11812.112.22.8
Nov33° / 24°26823.112.32.3
Dec32° / 24°33227.712.42.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 5% of December, with mostly cloudy or overcast conditions the remaining 94%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1892
2892
3892
4892
5793
6694
7694
8694
9694
10595
11595
12595
13595
14595
15595
16595
17595
18595
19595
20595
21595
22595
23595
24595
25694
26694
27694
28694
29793
30793
31793

Chance of precipitation in December

Any precipitation

Cepu gets around 332 mm of rain over 27.7 wet days in December, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 89% and peaks near 90% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
188
288
389
489
590
690
790
890
990
1090
1190
1290
1390
1490
1590
1690
1789
1889
1989
2088
2188
2288
2388
2488
2588
2689
2789
2889
2990
3090
3190

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the oppressive band about 57% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
115247
215148
315148
415049
514950
614950
714950
814950
914950
1014950
1105050
1205149
1305248
1405347
1505446
1605545
1705644
1805743
1905941
2006040
2106139
2206238
2306337
2406436
2506436
2606535
2706634
2806634
2906733
3006832
3106832

Wind in December

Winds average 5 km/h in December.

Across December, daily wind ranges from about 4 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
14calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in December

DaylightNight

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

Days grow by about 0 minutes over December. Sunrise moves from 5:12 AM to 5:24 AM, and sunset from 5:35 PM to 5:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:125:35
212.45:125:35
312.45:125:36
412.45:135:36
512.45:135:37
612.45:135:37
712.45:145:38
812.45:145:38
912.45:155:39
1012.45:155:39
1112.45:155:40
1212.45:165:40
1312.45:165:41
1412.45:175:41
1512.45:175:42
1612.45:175:42
1712.45:185:43
1812.45:185:43
1912.45:195:44
2012.45:195:44
2112.45:205:45
2212.45:205:45
2312.45:215:46
2412.45:215:46
2512.45:225:46
2612.45:225:47
2712.45:235:47
2812.45:235:48
2912.45:245:48
3012.45:245:49
3112.45:245:49

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.99 kWh/m².

For context, solar energy here swings from a low near 4.84 kWh/m² to a high of 6.48 kWh/m² in September across the year — December's 4.99 kWh/m² sits near the bottom.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.1Bright
45.1Bright
55.1Bright
65.1Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
305.0Bright
315.0Bright
Planning a trip in December

Hazard calendar for Cepu

In seasonPeak

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

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

Cepu's rainy season runs November–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 December a good time to visit Cepu?

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

2.3
Sightseeing
9th-best month of the year
3.7
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Cepu.

What to pack for Cepu in December

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

In December, Cepu sees daytime highs around 32°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 28 days see rain.

light clothesrain gearsun protection

Sea temperature near Cepu in December

The nearest coast averages about 30°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 58 km away) is warmest in November at about 30°C and coldest in August near 28°C.

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

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr30Tropical
May30Tropical
Jun29Tropical
Jul29Tropical
Aug28Tropical
Sep29Tropical
Oct29Tropical
Nov30Tropical
Dec30Tropical

UV index in Cepu in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December 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 Cepu peaks around March 17 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 15 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeVery highMar 17UV 13Jun 15UV 8
UV index (midday)Level
Jan12Extreme
Feb10Extreme
Mar13Extreme
Apr11Extreme
May9Very high
Jun7Very high
Jul9Very high
Aug11Extreme
Sep12Extreme
Oct12Extreme
Nov9Very high
Dec10Very high

Air quality in Cepu in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Cepu is worst in May — around 64 µg/m³ PM2.5 (unhealthy), and holds fairly steady the rest of the year.

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyPoorMay 1764 µg/m³Dec 2343 µg/m³
PM2.5 (µg/m³)Level
Jan44Poor
Feb45Poor
Mar53Poor
Apr59Unhealthy
May64Unhealthy
Jun60Unhealthy
Jul54Poor
Aug48Poor
Sep47Poor
Oct49Poor
Nov48Poor
Dec43Poor
Location & terrain

Where is Cepu?

Cepu sits at 7.1°S, 111.6°E, 36 m above sea level, in Indonesia. The nearest listed city is Blora, 27 km away.

Topography around Cepu

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

Within 3 km, the terrain around Cepu has only modest variations in elevation — a maximum elevation change of 65 m around an average of 36 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 267 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,224 m.

The land around Cepu is covered by cropland (33%), trees (31%) and artificial surfaces (24%) within 3 km, trees (46%) and cropland (37%) within 16 km, and trees (42%) and cropland (34%) within 80 km.

3 km
65 m
16 km
267 m
80 km
3,224 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Blora 27 km · Bojonegoro 32 km · Ngawi 33 km · Lasem 53 km · Madiun 54 km · Rembangan 56 km · Tuban 59 km · Nganjuk 61 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 Cepu (-7.1475°, 111.5906°, elevation 36 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).