Sepatan weather in December

In December, Sepatan sees average daytime highs of 30°C and overnight lows near 25°C, with 245 mm of rain across 26.1 wet days and about 12.3 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 miserable.

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 Sepatan's 11th-clearest and 1st-windiest month. For the whole year in context, see Sepatan's year-round climate.

Daytime high
30°
10th warmest
Overnight low
25°
8th coldest
Rainfall
245 mm
26.1 wet days
Daylight
12 h 24 min
5:39 AM – 6:00 PM
Cloud cover
88%
11th clearest
Wind
10 km/h
1st windiest
Solar energy
4.8 kWh/m²
Travel score
2.9
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 Sepatan reaches about 30°C in the afternoon and slips back to 25°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 29°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)
13126
23126
33126
43126
53126
63126
73026
83026
93026
103026
113025
123025
133025
143025
153025
163025
173025
183025
193025
203025
213025
223025
233025
243025
253025
263025
273025
283025
293025
303025
313025

How December really feels in Sepatan

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.

Sepatan 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° / 25°27928.512.32.8
Feb30° / 25°25026.412.22.7
Mar31° / 25°23228122.7
Apr31° / 26°19125.711.92.8
May31° / 26°12920.611.73.3
Jun31° / 25°9715.911.73.9
Jul31° / 25°681311.74.3
Aug31° / 25°389.811.84.5
Sep32° / 25°4911.2124.0
Oct32° / 26°10718.412.13.3
Nov31° / 26°18224.612.32.8
Dec30° / 25°24526.112.32.9

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 6% of December, with mostly cloudy or overcast conditions the remaining 91%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1991
2991
3892
4892
5892
6892
7892
8892
9892
10793
11793
12793
13793
14793
15793
16793
17793
18793
19793
20892
21892
22892
23892
24991
25991
261090
271189
281189
291189
301288
311288

Chance of precipitation in December

Any precipitation

Sepatan gets around 245 mm of rain over 26.1 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 84% and peaks near 87% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
185
285
385
485
585
685
785
885
985
1085
1185
1285
1385
1484
1584
1684
1783
1883
1983
2083
2183
2283
2383
2483
2584
2684
2785
2885
2986
3086
3187

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the miserable band about 66% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
113465
203466
303466
403367
503367
603367
703268
803268
903169
1003169
1103070
1203070
1303070
1403070
1503070
1603070
1703169
1803169
1903268
2003367
2103466
2203565
2303664
2403664
2503763
2603862
2703862
2803862
2903862
3003862
3103862

Wind in December

Winds average 10 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 9 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

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 5:34 AM to 5:46 AM, and sunset from 5:53 PM to 6:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:345:53
212.35:345:54
312.35:345:54
412.35:355:55
512.35:355:55
612.35:355:56
712.35:365:56
812.35:365:57
912.35:365:57
1012.35:375:58
1112.35:375:58
1212.35:385:59
1312.45:385:59
1412.45:385:59
1512.45:396:00
1612.45:396:00
1712.45:406:01
1812.45:406:01
1912.45:416:02
2012.45:416:02
2112.45:426:03
2212.45:426:03
2312.45:426:04
2412.45:436:04
2512.45:436:05
2612.45:446:05
2712.45:446:06
2812.45:456:06
2912.45:456:07
3012.45:466:07
3112.45:466:07

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.8 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.8 kWh/m² to a high of 6.18 kWh/m² in September across the year — December's 4.8 kWh/m² sits near the bottom.

024151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
134.8Bright
144.8Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
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 December

Hazard calendar for Sepatan

In seasonPeak

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

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

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

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

2.9
Sightseeing
7th-best month of the year
4.1
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Sepatan.

What to pack for Sepatan in December

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

In December, Sepatan sees daytime highs around 30°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 26 days see rain.

light clothesrain gearsun protection

Sea temperature near Sepatan 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 28 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 Sepatan 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 Sepatan peaks around March 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 16 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 highExtremeVery highMar 15UV 15Nov 16UV 7
UV index (midday)Level
Jan13Extreme
Feb13Extreme
Mar15Extreme
Apr12Extreme
May9Very high
Jun8Very high
Jul9Very high
Aug9Very high
Sep10Very high
Oct11Extreme
Nov7High
Dec11Extreme

Air quality in Sepatan 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 Sepatan 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 Sepatan?

Sepatan sits at 6.1°S, 106.6°E, 11 m above sea level, in Indonesia. The nearest listed city is Teluknaga, 7.0 km away.

Topography around Sepatan

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

Within 3 km, the terrain around Sepatan has only modest variations in elevation — a maximum elevation change of 15 m around an average of 9 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 46 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,184 m.

The land around Sepatan is covered by artificial surfaces (42%) and cropland (40%) within 3 km, artificial surfaces (39%) and cropland (21%) within 16 km, and water (42%) and trees (34%) within 80 km.

3 km
15 m
16 km
46 m
80 km
2,184 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
December weather nearby: Teluknaga 7.0 km · Pasarkemis 8.0 km · Tangerang 9.0 km · Cikupa 15 km · Curug 16 km · Ciputat 19 km · Kresek 22 km · Serpong 24 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 Sepatan (-6.1189°, 106.575°, elevation 11 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).