Cianjur weather in September

In September, Cianjur sees average daytime highs of 31°C and overnight lows near 21°C, with 80 mm of rain across 11.1 wet days and about 12 hours of daylight. It is the 1st-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 17% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 54 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Cianjur's 4th-clearest and 4th-windiest month. For the whole year in context, see Cianjur's year-round climate.

Daytime high
31°
1st warmest
Overnight low
21°
4th coldest
Rainfall
80 mm
11.1 wet days
Daylight
12 hours
5:47 AM – 5:45 PM
Cloud cover
64%
4th clearest
Wind
4 km/h
4th windiest
Solar energy
5.92 kWh/m²
Travel score
4.4
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical September day in Cianjur reaches about 31°C in the afternoon and slips back to 21°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 33°C. Set against its neighbours, September runs on par with August and on par with October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13021
23121
33121
43121
53121
63121
73121
83121
93121
103121
113121
123121
133121
143121
153121
163121
173121
183121
193121
203121
213121
223121
233121
243121
253122
263122
273122
283122
293122
303122

How September really feels in Cianjur

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.

Cianjur weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 22°30529.112.43.2
Feb28° / 22°2912712.23.1
Mar29° / 22°29929.4122.9
Apr29° / 22°2582711.93.1
May29° / 22°14021.811.73.8
Jun29° / 21°8314.911.64.6
Jul30° / 21°6710.811.65.0
Aug30° / 21°558.211.85.0
Sep31° / 21°8011.1124.4
Oct30° / 22°22819.912.23.6
Nov29° / 22°32826.512.33.1
Dec29° / 22°32227.712.43.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 26% of September, with mostly cloudy or overcast conditions the remaining 57%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24951
34951
44951
54951
64852
74852
84852
94852
104852
114654
124654
134555
144456
154357
164258
174258
184159
194159
204060
214060
223961
233862
243862
253862
263862
273862
283763
293664
303664

Chance of precipitation in September

Any precipitation

Cianjur gets around 80 mm of rain over 11.1 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 37% and peaks near 50% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
135
235
335
435
534
634
733
833
933
1033
1133
1233
1333
1433
1533
1634
1734
1835
1936
2037
2139
2240
2341
2442
2544
2645
2746
2847
2949
3050

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 58% of days. Sticky, muggy-or-worse air turns up on roughly 84% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11146124
21146124
31146124
41146124
51156024
61156123
71166023
81166023
92166022
102175922
111176121
121176121
131176121
141176121
151176022
161176022
171176022
181175923
191175923
201175824
211165825
221165726
231155727
240155728
250145729
260145531
270135532
280135433
290125335
300125236

Wind in September

Winds average 4 km/h in September.

Across September, 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.

0246810151015202530
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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 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 12 minutes over September. Sunrise moves from 5:55 AM to 5:39 AM, and sunset from 5:47 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:555:47
211.95:555:47
311.95:545:47
411.95:545:47
511.95:535:47
611.95:525:46
711.95:525:46
811.95:515:46
911.95:515:46
1011.95:505:46
1111.95:505:46
1211.95:495:45
1311.95:495:45
1412.05:485:45
1512.05:475:45
1612.05:475:45
1712.05:465:44
1812.05:465:44
1912.05:455:44
2012.05:455:44
2112.05:445:44
2212.05:435:44
2312.05:435:43
2412.05:425:43
2512.05:425:43
2612.05:415:43
2712.05:415:43
2812.05:405:43
2912.05:405:42
3012.15:395:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.92 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.33 kWh/m² to a high of 5.92 kWh/m² in September across the year — September's 5.92 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.8Bright
55.8Bright
65.9Bright
75.9Bright
85.9Bright
95.9Bright
105.9Bright
115.9Bright
126.0Bright
136.0Bright
146.0Bright
156.0Bright
166.0Bright
176.0Bright
186.0Bright
196.0Bright
206.0Bright
215.9Bright
225.9Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
275.9Bright
285.9Bright
295.9Bright
305.9Bright
Planning a trip in September

Hazard calendar for Cianjur

In seasonPeak

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

Cianjur's rainy season runs October–April, when most of the year's rain falls.

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

Is September a good time to visit Cianjur?

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

4.4
Sightseeing
4th-best month of the year
6.3
Beach & pool
3rd-best month of the year

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

What to pack for Cianjur in September

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

In September, Cianjur sees daytime highs around 31°C and nights near 21°C. Pack light clothes. Worth having: rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

UV index in Cianjur in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Cianjur peaks around March 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 15 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeVery highExtremeMar 15UV 15Nov 15UV 7
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar16Extreme
Apr12Extreme
May9Very high
Jun8Very high
Jul9Very high
Aug11Extreme
Sep12Extreme
Oct11Extreme
Nov7High
Dec12Extreme

Air quality in Cianjur in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Cianjur is worst in May — around 121 µg/m³ PM2.5 (unhealthy), and holds fairly steady the rest of the year.

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

0306090120150JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyMay 21120 µg/m³Jan 1177 µg/m³
PM2.5 (µg/m³)Level
Jan77Unhealthy
Feb81Unhealthy
Mar95Unhealthy
Apr106Unhealthy
May121Unhealthy
Jun117Unhealthy
Jul108Unhealthy
Aug92Unhealthy
Sep84Unhealthy
Oct84Unhealthy
Nov87Unhealthy
Dec77Unhealthy
Location & terrain

Where is Cianjur?

Cianjur sits at 6.8°S, 107.1°E, 456 m above sea level, in Indonesia. The nearest listed city is Ciranjang-hilir, 13 km away.

Topography around Cianjur

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

Within 3 km, the terrain around Cianjur has only modest variations in elevation — a maximum elevation change of 193 m around an average of 450 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,513 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,993 m.

The land around Cianjur is covered by artificial surfaces (41%), cropland (32%) and trees (26%) within 3 km, trees (60%) and cropland (28%) within 16 km, and trees (68%) within 80 km.

3 km
193 m
16 km
2,513 m
80 km
2,993 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Ciranjang-hilir 13 km · Sukabumi 26 km · Padalarang 37 km · Caringin 37 km · Cicurug 40 km · Purwakarta 45 km · Cimahi 45 km · Bogor 46 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 Cianjur (-6.8222°, 107.1394°, elevation 456 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. 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).