Sinjai weather in December

In December, Sinjai sees average daytime highs of 29°C and overnight lows near 25°C, with 183 mm of rain across 26.4 wet days and about 12.3 hours of daylight. It is the 2nd-warmest and 6th-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 5% 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 18 min by month's end. Set against the rest of the year, December is Sinjai's 10th-clearest and 10th-windiest month. For the whole year in context, see Sinjai's year-round climate.

Daytime high
29°
2nd warmest
Overnight low
25°
12th coldest
Rainfall
183 mm
26.4 wet days
Daylight
12 h 18 min
5:46 AM – 6:04 PM
Cloud cover
87%
10th clearest
Wind
6 km/h
10th windiest
Solar energy
4.92 kWh/m²
Travel score
3.2
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

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

A typical December day in Sinjai reaches about 29°C in the afternoon and slips back to 25°C overnight — a 4°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, December runs on par with November and on par with January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12925
22925
32925
42925
52925
62925
72925
82925
92925
102925
112925
122925
132925
142925
152925
162925
172925
182925
192925
202925
212925
222925
232925
242925
252925
262925
272925
282925
292925
302925
312925

How December really feels in Sinjai

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.

Sinjai weather by month

How December compares with the rest of the year at a glance. December is the 2nd-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 25°1862512.33.4
Feb29° / 25°17022.912.23.3
Mar29° / 25°18626.9123.3
Apr28° / 25°19927.111.93.3
May28° / 24°20727.411.83.9
Jun27° / 24°21925.811.74.1
Jul27° / 23°16623.511.74.6
Aug27° / 23°6615.611.85.8
Sep28° / 24°399.6126.3
Oct29° / 24°6112.412.15.2
Nov30° / 25°11519.212.24.0
Dec29° / 25°18326.412.33.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 5% 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 89%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11981
21783
31783
41783
51684
61684
71684
81585
91486
101486
111486
121387
131288
141288
151189
161090
17991
18991
19892
20892
21793
22694
23694
24694
25694
26694
27595
28595
29595
30595
31595

Chance of precipitation in December

Any precipitation

Sinjai gets around 183 mm of rain over 26.4 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 86% and peaks near 88% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
182
283
383
484
584
685
785
886
986
1086
1187
1287
1388
1488
1588
1688
1788
1888
1987
2087
2187
2286
2386
2485
2585
2685
2785
2885
2984
3084
3184

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 99% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
11981
21981
31972
41972
50982
60982
70982
80982
90982
100982
110982
120982
130982
140991
150991
160991
170991
180991
190991
200991
210991
2201000
2301000
2401000
2501000
2601000
2701000
2801000
2901000
3001000
310991

Wind in December

Winds average 6 km/h in December.

Across December, daily wind ranges from about 6 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
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 18 min at the start of December to 12 h 18 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 5:40 AM to 5:53 AM, and sunset from 5:57 PM to 6:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:405:57
212.35:415:57
312.35:415:58
412.35:415:58
512.35:425:59
612.35:425:59
712.35:436:00
812.35:436:00
912.35:436:01
1012.35:446:01
1112.35:446:02
1212.35:456:02
1312.35:456:03
1412.35:456:03
1512.35:466:04
1612.35:466:04
1712.35:476:04
1812.35:476:05
1912.35:486:05
2012.35:486:06
2112.35:496:06
2212.35:496:07
2312.35:506:07
2412.35:506:08
2512.35:506:08
2612.35:516:09
2712.35:516:09
2812.35:526:10
2912.35:526:10
3012.35:536:11
3112.35:536:11

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.92 kWh/m².

For context, solar energy here swings from a low near 4.39 kWh/m² to a high of 6.57 kWh/m² in October across the year — December's 4.92 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.2Bright
45.2Bright
55.2Bright
65.1Bright
75.1Bright
85.1Bright
95.1Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
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 Sinjai

In seasonPeak

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

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

Cyclone
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Sinjai?

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

3.2
Sightseeing
12th-best month of the year
4.2
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Sinjai.

What to pack for Sinjai in December

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

In December, Sinjai sees daytime highs around 29°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 Sinjai 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 14 km away) is warmest in April 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
Jan30Tropical
Feb29Tropical
Mar30Tropical
Apr30Tropical
May29Tropical
Jun29Tropical
Jul28Warm
Aug28Warm
Sep28Tropical
Oct29Tropical
Nov30Tropical
Dec30Tropical

UV index in Sinjai in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sinjai peaks around February 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 15UV 15Jul 10UV 10
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Extreme
Aug12Extreme
Sep13Extreme
Oct14Extreme
Nov13Extreme
Dec12Extreme
Location & terrain

Where is Sinjai?

Sinjai sits at 5.1°S, 120.3°E, 6 m above sea level, in Indonesia. The nearest listed city is Watampone, 66 km away.

Topography around Sinjai

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

Within 3 km, the terrain around Sinjai has only modest variations in elevation — a maximum elevation change of 100 m around an average of 21 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 717 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,838 m.

The land around Sinjai is covered by trees (38%) and cropland (21%) within 3 km, trees (46%) and water (35%) within 16 km, and trees (48%) and water (41%) within 80 km.

3 km
100 m
16 km
717 m
80 km
2,838 m
treesgrasslandcroplandartificial surfaceswatermangroves
December weather nearby: Watampone 66 km · Maros 76 km · Makassar 91 km · Galesong 101 km · Sengkang 114 km · Parepare 142 km · Polewali 213 km · Majene 226 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 Sinjai (-5.1241°, 120.253°, elevation 6 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).