Sumbawa Besar weather in January

In January, Sumbawa Besar sees average daytime highs of 29°C and overnight lows near 24°C, with 338 mm of rain across 29.1 wet days and about 12.4 hours of daylight. It is the 11th-warmest and 1st-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 2% of the time in January, and the air most often feels oppressive.

Daylight stretches from about 12 h 30 min at the start of January to 12 h 24 min by month's end. Set against the rest of the year, January is Sumbawa Besar's 12th-clearest and 8th-windiest month. For the whole year in context, see Sumbawa Besar's year-round climate.

Daytime high
29°
11th warmest
Overnight low
24°
10th coldest
Rainfall
338 mm
29.1 wet days
Daylight
12 h 24 min
6:06 AM – 6:33 PM
Cloud cover
87%
12th clearest
Wind
7 km/h
8th windiest
Solar energy
5.06 kWh/m²
Travel score
3.0
out of 10

Sumbawa Besar is place in Lesser Sunda Islands, 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 29°C through the month.

A typical January day in Sumbawa Besar reaches about 29°C in the afternoon and slips back to 24°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, January runs about 1°C cooler than December and on par with February.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12924
22924
32924
42924
52924
62924
72924
82924
92924
102924
112924
122924
132924
142924
152924
162924
172924
182924
192924
202924
212924
222924
232924
242824
252824
262824
272824
282824
292824
302824
312824

How January really feels in Sumbawa Besar

Once humidity and wind are folded in, January 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 January is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Sumbawa Besar weather by month

How January compares with the rest of the year at a glance. January is the 11th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 24°33829.112.43.0
Feb29° / 24°31726.412.33.1
Mar29° / 24°23525.312.13.4
Apr30° / 24°1061711.84.2
May30° / 23°31711.65.4
Jun30° / 23°143.311.56.1
Jul29° / 22°61.611.66.5
Aug30° / 22°10.411.76.3
Sep31° / 23°51.2125.5
Oct32° / 24°224.812.24.7
Nov31° / 24°9414.712.43.7
Dec30° / 24°26426.612.53.1

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in January, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 8% of January, with mostly cloudy or overcast conditions the remaining 90%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11189
21189
31189
41189
51288
61387
71387
81288
91288
101288
111288
121288
131288
141288
151288
161288
171288
181189
191090
201090
21991
22991
23991
24892
25793
26694
27694
28694
29694
30694
31595

Chance of precipitation in January

Any precipitation

Sumbawa Besar gets around 338 mm of rain over 29.1 wet days in January, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 94% and peaks near 97% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202531
Rain chance (%)
190
291
391
491
592
692
792
892
992
1092
1193
1293
1393
1493
1593
1693
1794
1894
1994
2094
2195
2295
2395
2496
2596
2696
2797
2897
2997
3097
3197

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the oppressive band about 75% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
17327
27327
37426
47426
57525
67624
77723
87723
97822
107822
117822
127822
137822
147822
157822
167723
177723
187624
197624
207525
217426
227426
237426
247327
257327
267327
277327
287327
297327
307327
317327

Wind in January

Winds average 7 km/h in January.

Across January, daily wind ranges from about 6 km/h on the calmest days to 8 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
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 12 h 30 min at the start of January to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over January. Sunrise moves from 5:59 AM to 6:12 AM, and sunset from 6:28 PM to 6:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.55:596:28
212.55:596:28
312.56:006:29
412.56:006:29
512.56:016:30
612.56:016:30
712.56:026:30
812.56:026:31
912.56:036:31
1012.56:036:31
1112.56:046:32
1212.56:046:32
1312.56:056:32
1412.56:056:32
1512.46:066:33
1612.46:066:33
1712.46:076:33
1812.46:076:33
1912.46:086:34
2012.46:086:34
2112.46:096:34
2212.46:096:34
2312.46:096:34
2412.46:106:34
2512.46:106:34
2612.46:116:35
2712.46:116:35
2812.46:116:35
2912.46:126:35
3012.46:126:35
3112.46:126:35

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 5.06 kWh/m².

For context, solar energy here swings from a low near 4.84 kWh/m² to a high of 6.73 kWh/m² in October across the year — January's 5.06 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.1Bright
135.1Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.0Bright
214.9Bright
224.9Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
304.9Bright
314.9Bright
Planning a trip in January

Hazard calendar for Sumbawa Besar

In seasonPeak

In January, Sumbawa Besar sits inside its cyclone and monsoon season. The full year is below, with each hazard's peak months called out.

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

Sumbawa Besar's monsoon runs December–March, when most of the year's rain falls.

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

Is January a good time to visit Sumbawa Besar?

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

3.0
Sightseeing
12th-best month of the year
3.8
Beach & pool
11th-best month of the year

January is a weaker month for outdoor sightseeing in Sumbawa Besar.

What to pack for Sumbawa Besar in January

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

In January, Sumbawa Besar sees daytime highs around 29°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 29 days see rain.

light clothesrain gearsun protection

Sea temperature near Sumbawa Besar 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 14 km away) is warmest in November 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
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr30Tropical
May29Tropical
Jun29Tropical
Jul28Warm
Aug28Warm
Sep28Warm
Oct29Tropical
Nov30Tropical
Dec29Tropical

UV index in Sumbawa Besar in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sumbawa Besar peaks around March 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 12UV 15Jul 10UV 9
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar15Extreme
Apr13Extreme
May11Extreme
Jun10Very high
Jul9Very high
Aug12Extreme
Sep13Extreme
Oct13Extreme
Nov11Extreme
Dec13Extreme

Air quality in Sumbawa Besar 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 Sumbawa Besar is worst in October — around 30 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (March, 10 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateOct 1529 µg/m³Mar 1610 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb10Good
Mar10Good
Apr10Good
May12Good
Jun12Good
Jul12Moderate
Aug15Moderate
Sep23Moderate
Oct30Moderate
Nov21Moderate
Dec13Moderate
Location & terrain

Where is Sumbawa Besar?

Sumbawa Besar sits at 8.5°S, 117.4°E, 14 m above sea level, in Indonesia. The nearest listed city is Taliwang, 68 km away.

Topography around Sumbawa Besar

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

Within 3 km, the terrain around Sumbawa Besar has only modest variations in elevation — a maximum elevation change of 115 m around an average of 32 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 948 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,795 m.

The land around Sumbawa Besar is covered by grassland (33%), trees (24%) and artificial surfaces (23%) within 3 km, trees (31%), water (25%) and grassland (22%) within 16 km, and water (54%) and trees (32%) within 80 km.

3 km
115 m
16 km
948 m
80 km
2,795 m
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Taliwang 68 km · Selong 99 km · Dompu 115 km · Praya 129 km · Lombok 144 km · Bima 144 km · Gili Trawangan 153 km · Amlapura 198 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 Sumbawa Besar (-8.4932°, 117.4202°, 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. 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).