Utan weather in December

In December, Utan sees average daytime highs of 30°C and overnight lows near 24°C, with 287 mm of rain across 27.6 wet days and about 12.4 hours of daylight. It is the 10th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 2% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 18 min at the start of December to 12 h 24 min by month's end. Set against the rest of the year, December is Utan's 11th-clearest and 3rd-windiest month. For the whole year in context, see Utan's year-round climate.

Daytime high
30°
10th warmest
Overnight low
24°
9th coldest
Rainfall
287 mm
27.6 wet days
Daylight
12 h 24 min
5:38 AM – 5:59 PM
Cloud cover
89%
11th clearest
Wind
8 km/h
3rd windiest
Solar energy
4.88 kWh/m²
Travel score
2.7
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical December day in Utan reaches about 30°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 32°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)
13124
23124
33124
43124
53124
63124
73024
83024
93024
103024
113024
123024
133024
143024
153024
163024
173024
183024
193024
203024
213024
223024
233024
243024
253024
263024
273024
283024
293024
303024
313024

How December really feels in Utan

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.

Utan weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 24°33129.112.32.8
Feb30° / 24°3092712.22.7
Mar30° / 24°27929.4122.6
Apr31° / 24°21826.511.92.7
May31° / 24°12421.211.73.3
Jun31° / 24°8315.311.63.9
Jul31° / 23°6411.711.74.4
Aug31° / 23°388.311.84.5
Sep32° / 24°5711.4123.9
Oct32° / 24°1442012.13.1
Nov31° / 24°24526.812.32.6
Dec30° / 24°28727.612.42.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% 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 93%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1793
2793
3793
4793
5694
6694
7694
8694
9793
10793
11694
12694
13694
14694
15694
16694
17694
18694
19694
20694
21694
22694
23694
24694
25793
26793
27793
28793
29793
30892
31892

Chance of precipitation in December

Any precipitation

Utan gets around 287 mm of rain over 27.6 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 90% and peaks near 91% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
189
289
390
490
590
690
790
891
991
1091
1191
1291
1391
1491
1591
1690
1790
1889
1989
2088
2188
2288
2388
2488
2588
2688
2788
2889
2989
3089
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 81% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
117920
217920
317920
417821
517920
617920
717920
817920
917920
1018019
1118019
1218019
1318019
1418118
1518118
1618118
1718118
1818118
1908218
2008317
2108317
2208317
2308317
2408317
2508416
2608416
2708416
2808416
2908416
3008416
3108416

Wind in December

Winds average 8 km/h in December.

Across December, daily wind ranges from about 7 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 18 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 6 minutes over December. Sunrise moves from 5:32 AM to 5:45 AM, and sunset from 5:52 PM to 6:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:325:52
212.35:325:52
312.35:335:53
412.35:335:53
512.35:335:54
612.35:345:54
712.35:345:55
812.35:345:55
912.35:355:56
1012.45:355:56
1112.45:365:57
1212.45:365:57
1312.45:365:58
1412.45:375:58
1512.45:375:59
1612.45:385:59
1712.45:386:00
1812.45:396:00
1912.45:396:01
2012.45:396:01
2112.45:406:01
2212.45:406:02
2312.45:416:02
2412.45:416:03
2512.45:426:03
2612.45:426:04
2712.45:436:04
2812.45:436:05
2912.45:446:05
3012.45:446:06
3112.45:456:06

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.88 kWh/m².

For context, solar energy here swings from a low near 4.78 kWh/m² to a high of 6.34 kWh/m² in September across the year — December's 4.88 kWh/m² sits near the bottom.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.9Bright
234.9Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
314.8Bright
Planning a trip in December

Hazard calendar for Utan

In seasonPeak

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

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

Utan'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 Utan?

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

2.7
Sightseeing
8th-best month of the year
3.9
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Utan.

What to pack for Utan in December

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

In December, Utan sees daytime highs around 30°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 Utan in December

The nearest coast averages about 29°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 34 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
Apr30Tropical
May30Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov30Tropical
Dec29Tropical

UV index in Utan in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Utan peaks around March 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 13 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highMar 17UV 15Nov 13UV 7
UV index (midday)Level
Jan12Extreme
Feb11Extreme
Mar15Extreme
Apr12Extreme
May9Very high
Jun8Very high
Jul9Very high
Aug9Very high
Sep9Very high
Oct9Very high
Nov6High
Dec11Extreme

Air quality in Utan 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 Utan is worst in May — around 69 µg/m³ PM2.5 (unhealthy), and holds fairly steady the rest of the year.

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyMay 1268 µg/m³Jan 2248 µg/m³
PM2.5 (µg/m³)Level
Jan48Poor
Feb48Poor
Mar62Unhealthy
Apr68Unhealthy
May69Unhealthy
Jun65Unhealthy
Jul58Unhealthy
Aug59Unhealthy
Sep64Unhealthy
Oct68Unhealthy
Nov69Unhealthy
Dec50Poor
Location & terrain

Where is Utan?

Utan sits at 6.2°S, 106.9°E, 10 m above sea level, in Indonesia. The nearest listed city is Bekasi, 8.0 km away.

Topography around Utan

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

Within 3 km, the terrain around Utan has only modest variations in elevation — a maximum elevation change of 19 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 66 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,001 m.

The land around Utan is covered by artificial surfaces (74%) within 3 km, artificial surfaces (61%) within 16 km, and water (39%) and trees (30%) within 80 km.

3 km
19 m
16 km
66 m
80 km
3,001 m
treesgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Bekasi 8.0 km · Jakarta 12 km · Cileungsir 24 km · Cikarang 25 km · South Tangerang 28 km · Depok 29 km · Ciputat 29 km · Pamulang 30 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 Utan (-6.1769°, 106.9467°, 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).