Kupang weather in September

In September, Kupang sees average daytime highs of 33°C and overnight lows near 23°C, with 4 mm of rain across 0.8 wet days and about 11.9 hours of daylight. It is the 3rd-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 57% 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 Kupang's 2nd-clearest and 5th-windiest month. For the whole year in context, see Kupang's year-round climate.

Daytime high
33°
3rd warmest
Overnight low
23°
3rd coldest
Rainfall
4 mm
0.8 wet days
Daylight
11 h 54 min
5:42 AM – 5:38 PM
Cloud cover
38%
2nd clearest
Wind
12 km/h
5th windiest
Solar energy
6.82 kWh/m²
Travel score
4.5
out of 10

Kupang is administrative city in Kupang Regency, Indonesia.

Founded
1978

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 33°C through the month.

A typical September day in Kupang reaches about 33°C in the afternoon and slips back to 23°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 32°C and 34°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13223
23223
33223
43323
53323
63323
73323
83323
93323
103323
113323
123323
133323
143323
153323
163323
173323
183323
193323
203323
213324
223324
233324
243324
253324
263324
273324
283324
293324
303324

How September really feels in Kupang

Once humidity and wind are folded in, September averages 30 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
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Kupang weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 25°27226.912.52.9
Feb30° / 25°24225.212.32.9
Mar31° / 25°19922.612.13.3
Apr32° / 25°7811.111.83.8
May32° / 25°233.711.54.5
Jun32° / 24°151.911.45.2
Jul31° / 23°4111.55.5
Aug32° / 23°20.511.75.2
Sep33° / 23°40.811.94.5
Oct34° / 25°183.512.23.6
Nov34° / 26°7310.512.53.0
Dec31° / 25°23624.512.62.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 57% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 25%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17723
27723
37723
47723
57723
67723
77624
87624
97624
107624
117525
127525
137525
147426
157426
167426
177426
187426
197426
207426
217426
227426
237327
247327
257327
267327
277327
287228
297228
307129

Chance of precipitation in September

Any precipitation

Kupang gets around 4 mm of rain over 0.8 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 3% and peaks near 6% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
12
22
32
42
52
62
72
82
92
102
112
122
132
142
152
162
173
183
193
203
213
223
233
244
254
264
275
285
296
306

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 62% of days. Sticky, muggy-or-worse air turns up on roughly 83% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
14256011
24246111
34236112
44236112
53226312
63216412
73216313
83206413
92206513
102196514
112186614
121186615
131176616
141176517
151166518
161166419
171156420
181146421
191146223
201136224
211126225
221126126
230116227
240106228
25096130
26096031
27086032
28075934
29075835
30065737

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2811calm
2911calm
3011calm

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 5:51 AM to 5:32 AM, and sunset from 5:39 PM to 5:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.85:515:39
211.85:515:39
311.85:505:39
411.85:495:39
511.85:495:39
611.85:485:39
711.95:475:39
811.95:475:39
911.95:465:39
1011.95:465:39
1111.95:455:39
1211.95:445:39
1311.95:445:38
1411.95:435:38
1511.95:425:38
1611.95:425:38
1712.05:415:38
1812.05:405:38
1912.05:405:38
2012.05:395:38
2112.05:385:38
2212.05:385:38
2312.05:375:38
2412.05:365:38
2512.05:365:38
2612.05:355:37
2712.15:345:37
2812.15:345:37
2912.15:335:37
3012.15:325:37

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.82 kWh/m².

For context, solar energy here swings from a low near 5.04 kWh/m² to a high of 7.07 kWh/m² in October across the year — September's 6.82 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.5Intense
26.5Intense
36.6Intense
46.6Intense
56.6Intense
66.6Intense
76.7Intense
86.7Intense
96.7Intense
106.7Intense
116.7Intense
126.8Intense
136.8Intense
146.8Intense
156.8Intense
166.8Intense
176.8Intense
186.9Intense
196.9Intense
206.9Intense
216.9Intense
226.9Intense
236.9Intense
246.9Intense
257.0Intense
267.0Intense
277.0Intense
287.0Intense
297.0Intense
307.0Intense
Planning a trip in September

Hazard calendar for Kupang

In seasonPeak

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

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

Kupang'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 Kupang?

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

4.5
Sightseeing
4th-best month of the year
7.8
Beach & pool
4th-best month of the year

September is a reasonable time to visit Kupang for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Kupang in September

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

In September, Kupang sees daytime highs around 33°C and nights near 23°C. Pack light clothes and sun protection.

light clothessun protection

Sea temperature near Kupang 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 offshore 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°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May28Tropical
Jun28Warm
Jul27Warm
Aug27Warm
Sep27Warm
Oct28Tropical
Nov29Tropical
Dec30Tropical

UV index in Kupang in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Kupang peaks around February 20 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 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 20UV 16Jun 20UV 9
UV index (midday)Level
Jan14Extreme
Feb16Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun9Very high
Jul9Very high
Aug12Extreme
Sep13Extreme
Oct13Extreme
Nov14Extreme
Dec13Extreme
Location & terrain

Where is Kupang?

Kupang sits at 10.2°S, 123.6°E, 94 m above sea level, in Indonesia. The nearest listed city is Soe, 82 km away.

Topography around Kupang

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

Within 3 km, the terrain around Kupang has only modest variations in elevation — a maximum elevation change of 201 m around an average of 79 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 510 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,713 m.

The land around Kupang is covered by artificial surfaces (64%) within 3 km, water (43%), trees (27%) and grassland (23%) within 16 km, and water (63%) and trees (28%) within 80 km.

3 km
201 m
16 km
510 m
80 km
1,713 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Soe 82 km · Kefamenanu 125 km · Atambua 184 km · Lewoleba 201 km · Suai 204 km · Maliana 220 km · Maumere 231 km · Atsabe 240 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 Kupang (-10.1708°, 123.6069°, elevation 94 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).