Atambua weather in September

In September, Atambua sees average daytime highs of 28°C and overnight lows near 22°C, with 9 mm of rain across 1.7 wet days and about 11.9 hours of daylight. It is the 4th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 49% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 48 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Atambua's 2nd-clearest and 7th-windiest month. For the whole year in context, see Atambua's year-round climate.

Daytime high
28°
4th warmest
Overnight low
22°
3rd coldest
Rainfall
9 mm
1.7 wet days
Daylight
12 hours
5:36 AM – 5:33 PM
Cloud cover
45%
2nd clearest
Wind
5 km/h
7th windiest
Solar energy
6.44 kWh/m²
Travel score
7.4
out of 10

Atambua is town in East Nusa Tenggara, Indonesia.

Density
1,465/km²
people per km²

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical September day in Atambua reaches about 28°C in the afternoon and slips back to 22°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 29°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12821
22821
32821
42822
52822
62822
72822
82822
92822
102822
112822
122822
132822
142822
152822
162822
172822
182822
192822
202822
212822
222822
232822
242822
252822
262822
272822
282922
292922
302922

How September really feels in Atambua

Once humidity and wind are folded in, September averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Atambua weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 24°29528.112.53.6
Feb27° / 24°26025.512.33.6
Mar28° / 24°2082312.14.3
Apr28° / 23°10214.311.85.2
May28° / 23°487.211.66.5
Jun28° / 22°273.911.57.4
Jul27° / 21°132.711.57.7
Aug27° / 21°71.211.78.0
Sep28° / 22°91.711.97.4
Oct29° / 23°183.912.26.4
Nov29° / 24°7010.512.45.2
Dec28° / 24°22624.612.53.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 49% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 31%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17228
27228
37129
47129
57129
67129
77129
87129
97030
107030
117030
126931
136931
146931
156931
166931
176931
186931
196931
206931
216832
226832
236832
246832
256733
266733
276733
286733
296733
306733

Chance of precipitation in September

Any precipitation

Atambua gets around 9 mm of rain over 1.7 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 6% and peaks near 8% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
14
24
34
44
54
64
75
85
95
105
115
125
135
145
156
166
176
186
196
206
216
227
237
247
257
267
278
288
298
308

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 67% of days. Sticky, muggy-or-worse air turns up on roughly 83% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
13246310
23246310
33236410
42236510
52236510
62226610
72226610
81226710
91216810
101216711
111206811
121206811
130206911
140196912
150187012
160177013
170176914
180167014
190157015
200147016
210137017
220127018
230116920
240116821
250106822
26096724
27096625
28086527
29086329
30076330

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 48 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over September. Sunrise moves from 5:45 AM to 5:28 AM, and sunset from 5:35 PM to 5:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.85:455:35
211.85:455:35
311.85:445:35
411.85:445:35
511.95:435:34
611.95:425:34
711.95:425:34
811.95:415:34
911.95:415:34
1011.95:405:34
1111.95:395:34
1211.95:395:34
1311.95:385:34
1411.95:375:33
1511.95:375:33
1612.05:365:33
1712.05:365:33
1812.05:355:33
1912.05:345:33
2012.05:345:33
2112.05:335:33
2212.05:325:33
2312.05:325:32
2412.05:315:32
2512.05:315:32
2612.05:305:32
2712.05:295:32
2812.15:295:32
2912.15:285:32
3012.15:285:32

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.44 kWh/m².

For context, solar energy here swings from a low near 4.83 kWh/m² to a high of 6.6 kWh/m² in October across the year — September's 6.44 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.3Intense
46.3Intense
56.3Intense
66.3Intense
76.3Intense
86.3Intense
96.4Intense
106.4Intense
116.4Intense
126.4Intense
136.4Intense
146.4Intense
156.4Intense
166.4Intense
176.5Intense
186.5Intense
196.5Intense
206.5Intense
216.5Intense
226.5Intense
236.5Intense
246.5Intense
256.5Intense
266.5Intense
276.5Intense
286.6Intense
296.6Intense
306.6Intense
Planning a trip in September

Hazard calendar for Atambua

In seasonPeak

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

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

Atambua'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 September a good time to visit Atambua?

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

7.4
Sightseeing
3rd-best month of the year
8.4
Beach & pool
1st-best month of the year

September is one of the better times to visit Atambua for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Atambua in September

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

In September, Atambua sees daytime highs around 28°C and nights near 22°C. Pack light clothes and sun protection.

light clothessun protection

Sea temperature near Atambua in September

The nearest coast averages about 27°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 26 km away) is warmest in December at about 30°C and coldest in August near 27°C.

The water stays above 20°C all year — warm enough for a swim any month.

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May29Tropical
Jun28Tropical
Jul27Warm
Aug27Warm
Sep27Warm
Oct29Tropical
Nov29Tropical
Dec30Tropical

UV index in Atambua in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Atambua peaks around February 22 at about 16 (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 highExtremeFeb 22UV 16Jul 10UV 9
UV index (midday)Level
Jan14Extreme
Feb16Extreme
Mar16Extreme
Apr14Extreme
May11Extreme
Jun10Very high
Jul9Very high
Aug12Extreme
Sep14Extreme
Oct14Extreme
Nov14Extreme
Dec12Extreme
Location & terrain

Where is Atambua?

Atambua sits at 9.1°S, 124.9°E, 336 m above sea level, in Indonesia. The nearest listed city is Maliana, 38 km away.

Topography around Atambua

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

Within 3 km, the terrain around Atambua has significant variations in elevation — a maximum elevation change of 300 m around an average of 351 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 944 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,916 m.

The land around Atambua is covered by grassland (45%), trees (30%) and artificial surfaces (22%) within 3 km, trees (46%) and grassland (44%) within 16 km, and water (47%) and trees (34%) within 80 km.

3 km
300 m
16 km
944 m
80 km
2,916 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Maliana 38 km · Suai 46 km · Atsabe 59 km · Kefamenanu 59 km · Maubara 65 km · Gleno 73 km · Liquiçá 76 km · Aileu 85 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 Atambua (-9.1061°, 124.8925°, elevation 336 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).