Tarutung weather in January

In January, Tarutung sees average daytime highs of 26°C and overnight lows near 18°C, with 261 mm of rain across 24.8 wet days and about 11.9 hours of daylight. It is the 6th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 1% of the time in January, and the air most often feels muggy.

Daylight stretches from about 11 h 54 min at the start of January to 11 h 54 min by month's end. Set against the rest of the year, January is Tarutung's 5th-clearest and 4th-windiest month. For the whole year in context, see Tarutung's year-round climate.

Daytime high
26°
6th warmest
Overnight low
18°
7th coldest
Rainfall
261 mm
24.8 wet days
Daylight
11 h 54 min
6:37 AM – 6:30 PM
Cloud cover
88%
5th clearest
Wind
4 km/h
4th windiest
Solar energy
4.67 kWh/m²
Travel score
4.1
out of 10

Tarutung is capital of North Tapanuli Regency in North Sumatra Province, Indonesia.

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

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 26°C through the month.

A typical January day in Tarutung reaches about 26°C in the afternoon and slips back to 18°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 28°C. Set against its neighbours, January runs on par with December and on par with February.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12618
22618
32618
42618
52618
62618
72617
82617
92617
102617
112617
122617
132617
142617
152617
162717
172717
182718
192718
202718
212718
222718
232718
242718
252718
262718
272718
282718
292718
302718
312718

Tarutung weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 18°26124.811.94.1
Feb27° / 18°23521.711.94.2
Mar27° / 18°26626.2123.9
Apr27° / 18°32527.4123.6
May27° / 18°21823.412.14.2
Jun27° / 17°14218.112.14.9
Jul26° / 17°16719.612.14.9
Aug26° / 17°2412312.14.4
Sep26° / 17°25624.4124.1
Oct26° / 17°36126.7123.9
Nov26° / 18°40028.511.93.5
Dec26° / 18°3452811.93.7

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 6% of January, with mostly cloudy or overcast conditions the remaining 93%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1694
2694
3793
4793
5793
6892
7892
8892
9991
10892
11793
12793
13793
14793
15793
16793
17793
18694
19694
20694
21694
22694
23694
24694
25694
26694
27793
28793
29793
30793
31793

Chance of precipitation in January

Any precipitation

Tarutung gets around 261 mm of rain over 24.8 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 81% and peaks near 85% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202531
Rain chance (%)
185
284
383
483
583
682
782
882
983
1083
1183
1283
1384
1484
1584
1684
1783
1883
1982
2082
2181
2280
2379
2478
2577
2677
2776
2876
2975
3075
3175

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the muggy band about 64% of days. Sticky, muggy-or-worse air turns up on roughly 64% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)
103169
203268
313366
413465
513564
613564
713663
813663
913663
1013663
1113663
1213663
1313663
1413564
1503565
1603565
1703565
1803565
1903565
2003565
2103565
2213564
2313564
2413663
2513663
2613762
2713861
2813861
2913960
3013960
3113960

Wind in January

Winds average 4 km/h in January.

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

0246810151015202531
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 11 h 54 min at the start of January 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 January. Sunrise moves from 6:31 AM to 6:40 AM, and sunset from 6:24 PM to 6:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:316:24
211.96:316:24
311.96:326:25
411.96:326:25
511.96:326:26
611.96:336:26
711.96:336:27
811.96:346:27
911.96:346:27
1011.96:346:28
1111.96:356:28
1211.96:356:29
1311.96:366:29
1411.96:366:30
1511.96:366:30
1611.96:376:30
1711.96:376:31
1811.96:376:31
1911.96:376:31
2011.96:386:32
2111.96:386:32
2211.96:386:32
2311.96:396:33
2411.96:396:33
2511.96:396:33
2611.96:396:34
2711.96:396:34
2811.96:406:34
2911.96:406:34
3011.96:406:35
3111.96:406:35

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 4.67 kWh/m².

For context, solar energy here swings from a low near 3.9 kWh/m² to a high of 5.14 kWh/m² in February across the year — January's 4.67 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.3Bright
24.4Bright
34.4Bright
44.4Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.6Bright
104.6Bright
114.6Bright
124.6Bright
134.6Bright
144.6Bright
154.6Bright
164.6Bright
174.7Bright
184.7Bright
194.7Bright
204.7Bright
214.7Bright
224.7Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.9Bright
294.9Bright
304.9Bright
314.9Bright
Planning a trip in January

Hazard calendar for Tarutung

In seasonPeak

None of Tarutung's seasonal hazards are active in January. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Tarutung sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.

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

Is January a good time to visit Tarutung?

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

4.1
Sightseeing
6th-best month of the year
4.0
Beach & pool
6th-best month of the year

January is a reasonable time to visit Tarutung for sightseeing.

What to pack for Tarutung in January

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

In January, Tarutung sees daytime highs around 26°C and nights near 18°C. Pack rain gear. Worth having: light clothes and sun protection. About 25 days see rain.

rain gearlight clothessun protection

Sea temperature near Tarutung in January

The nearest coast averages about 29°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 41 km away) is warmest in March 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
Sep30Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Tarutung in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January 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 Tarutung peaks around February 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 11 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 21UV 15Jun 18UV 11
UV index (midday)Level
Jan12Extreme
Feb15Extreme
Mar14Extreme
Apr13Extreme
May12Extreme
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep14Extreme
Oct14Extreme
Nov12Extreme
Dec12Extreme

Air quality in Tarutung in January

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Tarutung is worst in October — around 23 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateOct 1123 µg/m³Dec 1015 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb20Moderate
Mar22Moderate
Apr19Moderate
May18Moderate
Jun18Moderate
Jul19Moderate
Aug18Moderate
Sep22Moderate
Oct23Moderate
Nov15Moderate
Dec15Moderate
Location & terrain

Where is Tarutung?

Tarutung sits at 2.0°N, 99.0°E, 948 m above sea level, in Indonesia. The nearest listed city is Sibolga, 37 km away.

Topography around Tarutung

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

Within 3 km, the terrain around Tarutung has significant variations in elevation — a maximum elevation change of 493 m around an average of 1,012 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,310 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,257 m.

The land around Tarutung is covered by trees (52%) and cropland (30%) within 3 km, trees (78%) within 16 km, and trees (73%) within 80 km.

3 km
493 m
16 km
1,310 m
80 km
2,257 m
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Sibolga 37 km · Barus 63 km · Pangururan 72 km · Padangsidempuan 78 km · Bandar 87 km · Rantauprapat 97 km · Pematangsiantar 106 km · Paropo 107 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 Tarutung (2.0147°, 98.9655°, elevation 948 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).