Gunungsitoli weather in December

In December, Gunungsitoli sees average daytime highs of 29°C and overnight lows near 25°C, with 399 mm of rain across 28.4 wet days and about 11.9 hours of daylight. It is the 10th-warmest and 3rd-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 1% of the time in December, and the air most often feels miserable.

Daylight stretches from about 11 h 54 min at the start of December to 11 h 54 min by month's end. Set against the rest of the year, December is Gunungsitoli's 10th-clearest and 3rd-windiest month. For the whole year in context, see Gunungsitoli's year-round climate.

Daytime high
29°
10th warmest
Overnight low
25°
5th coldest
Rainfall
399 mm
28.4 wet days
Daylight
11 h 54 min
6:28 AM – 6:23 PM
Cloud cover
91%
10th clearest
Wind
5 km/h
3rd windiest
Solar energy
4.27 kWh/m²
Travel score
3.0
out of 10

Gunungsitoli is city in North Sumatra Province, Indonesia.

Density
487/km²
people per km²
Founded
2008

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

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 Gunungsitoli reaches about 29°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 27°C and 30°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 Gunungsitoli

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.

Gunungsitoli 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°2832611.93.1
Feb30° / 25°23523123.1
Mar30° / 25°31228.3122.7
Apr30° / 25°36028.2122.7
May30° / 25°28525.412.13.0
Jun30° / 25°23322.312.13.4
Jul30° / 25°26824.412.13.3
Aug29° / 25°33327123.1
Sep29° / 25°35227.3123.0
Oct29° / 25°47128.8123.0
Nov29° / 25°51128.711.92.9
Dec29° / 25°39928.411.93.0

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 3% of December, with mostly cloudy or overcast conditions the remaining 96%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1298
2397
3397
4397
5397
6397
7397
8397
9397
10496
11496
12496
13496
14496
15496
16496
17496
18496
19496
20496
21496
22496
23496
24496
25595
26595
27595
28595
29793
30793
31892

Chance of precipitation in December

Any precipitation

Gunungsitoli gets around 399 mm of rain over 28.4 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 91% and peaks near 95% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202531
Rain chance (%)
195
295
395
494
594
693
793
893
992
1092
1191
1291
1390
1490
1590
1690
1790
1890
1990
2091
2191
2291
2391
2491
2590
2690
2789
2889
2988
3087
3186

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 65% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
13664
23664
33664
43664
53664
63664
73664
83565
93565
103565
113466
123466
133466
143466
153367
163367
173367
183367
193367
203367
213367
223367
233466
243466
253565
263565
273664
283664
293763
303763
313862

Wind in December

Winds average 5 km/h in December.

Across December, daily wind ranges from about 5 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
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 54 min at the start of December to 11 h 54 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 6:21 AM to 6:35 AM, and sunset from 6:17 PM to 6:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:216:17
211.96:226:18
311.96:226:18
411.96:236:18
511.96:236:19
611.96:236:19
711.96:246:20
811.96:246:20
911.96:256:20
1011.96:256:21
1111.96:266:21
1211.96:266:22
1311.96:276:22
1411.96:276:23
1511.96:276:23
1611.96:286:23
1711.96:286:24
1811.96:296:24
1911.96:296:25
2011.96:306:25
2111.96:306:26
2211.96:316:26
2311.96:316:27
2411.96:326:27
2511.96:326:28
2611.96:336:28
2711.96:336:29
2811.96:346:29
2911.96:346:30
3011.96:346:30
3111.96:356:30

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.27 kWh/m².

For context, solar energy here swings from a low near 3.92 kWh/m² to a high of 5.31 kWh/m² in February across the year — December's 4.27 kWh/m² sits near the bottom.

024151015202531
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
34.1Bright
44.1Bright
54.1Bright
64.1Bright
74.2Bright
84.2Bright
94.2Bright
104.2Bright
114.2Bright
124.2Bright
134.2Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.4Bright
214.4Bright
224.4Bright
234.4Bright
244.4Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.6Bright
304.6Bright
314.6Bright
Planning a trip in December

Is December a good time to visit Gunungsitoli?

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

3.0
Sightseeing
6th-best month of the year
3.9
Beach & pool
8th-best month of the year

December is a weaker month for outdoor sightseeing in Gunungsitoli.

What to pack for Gunungsitoli in December

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

In December, Gunungsitoli sees daytime highs around 29°C and nights near 25°C. Pack light clothes and rain gear. About 28 days see rain.

light clothesrain gear

Sea temperature near Gunungsitoli 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 offshore is warmest in May at about 30°C and coldest in November 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
Feb30Tropical
Mar30Tropical
Apr30Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Gunungsitoli 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 Gunungsitoli peaks around February 19 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 11 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 19UV 14Jul 11UV 11
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar14Extreme
Apr14Extreme
May12Extreme
Jun11Extreme
Jul11Extreme
Aug12Extreme
Sep14Extreme
Oct14Extreme
Nov12Extreme
Dec12Extreme
Location & terrain

Where is Gunungsitoli?

Gunungsitoli sits at 1.3°N, 97.6°E, 14 m above sea level, in Indonesia. The nearest listed city is Lahewa, 51 km away.

Topography around Gunungsitoli

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

Within 3 km, the terrain around Gunungsitoli has only modest variations in elevation — a maximum elevation change of 223 m around an average of 42 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 367 m; within 80 km, large variations in elevation — a maximum elevation change of 834 m.

The land around Gunungsitoli is covered by trees (51%) and water (37%) within 3 km, trees (50%) and water (48%) within 16 km, and water (79%) and trees (21%) within 80 km.

3 km
223 m
16 km
367 m
80 km
834 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Lahewa 51 km · Teluk Dalam 82 km · Singkil 113 km · Barus 118 km · Sibolga 139 km · Subulussalam 156 km · Tarutung 170 km · Sidikalang 180 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 Gunungsitoli (1.2888°, 97.6143°, elevation 14 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. 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).