Bekasi weather in September

In September, Bekasi sees average daytime highs of 32°C and overnight lows near 24°C, with 57 mm of rain across 11.4 wet days and about 12 hours of daylight. It is the 1st-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 26% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Bekasi's 4th-clearest and 7th-windiest month. For the whole year in context, see Bekasi's year-round climate.

Daytime high
32°
1st warmest
Overnight low
24°
4th coldest
Rainfall
57 mm
11.4 wet days
Daylight
12 hours
5:47 AM – 5:45 PM
Cloud cover
60%
4th clearest
Wind
6 km/h
7th windiest
Solar energy
6.34 kWh/m²
Travel score
3.9
out of 10

Bekasi is city in West Java Province, Indonesia.

Density
12,581/km²
people per km²
Founded
1997

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 32°C through the month.

A typical September day in Bekasi reaches about 32°C in the afternoon and slips back to 24°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 33°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13224
23224
33224
43224
53224
63224
73224
83224
93224
103224
113224
123224
133224
143224
153224
163224
173224
183224
193224
203224
213224
223224
233224
243224
253224
263224
273224
283224
293224
303224

How September really feels in Bekasi

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.

Bekasi weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 24°33129.112.32.8
Feb30° / 24°3092712.22.7
Mar30° / 24°27929.4122.6
Apr31° / 24°21826.511.92.7
May31° / 24°12421.211.73.3
Jun31° / 24°8315.311.63.9
Jul31° / 23°6411.711.74.4
Aug31° / 23°388.311.84.5
Sep32° / 24°5711.4123.9
Oct32° / 24°1442012.13.1
Nov31° / 24°24526.812.32.6
Dec30° / 24°28727.612.42.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 24% of September, with mostly cloudy or overcast conditions the remaining 50%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25545
35545
45545
55545
65644
75545
85545
95446
105446
115347
125248
135248
145149
155050
164951
174951
184852
194852
204753
214753
224654
234654
244654
254555
264456
274456
284357
294258
304159

Chance of precipitation in September

Any precipitation

Bekasi gets around 57 mm of rain over 11.4 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 38% and peaks near 48% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
135
235
336
436
536
636
736
836
935
1035
1135
1235
1335
1435
1535
1635
1735
1836
1936
2037
2138
2239
2340
2441
2542
2644
2745
2846
2947
3048

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 84% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
116831
215841
315841
415841
515841
615841
716831
816831
916831
1016831
1116831
1216831
1316831
1416831
1516822
1616822
1716822
1815832
1915832
2014833
2113843
2213843
2312853
2411863
2510864
2610864
279874
289874
298884
308884

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over September. Sunrise moves from 5:55 AM to 5:40 AM, and sunset from 5:48 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:555:48
211.95:555:48
311.95:545:48
411.95:545:48
511.95:535:47
611.95:535:47
711.95:525:47
811.95:525:47
911.95:515:47
1011.95:515:47
1111.95:505:46
1211.95:505:46
1311.95:495:46
1412.05:485:46
1512.05:485:46
1612.05:475:45
1712.05:475:45
1812.05:465:45
1912.05:465:45
2012.05:455:45
2112.05:455:44
2212.05:445:44
2312.05:445:44
2412.05:435:44
2512.05:425:44
2612.05:425:43
2712.05:415:43
2812.05:415:43
2912.05:405:43
3012.05:405:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.34 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.78 kWh/m² to a high of 6.34 kWh/m² in September across the year — September's 6.34 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.2Intense
46.2Intense
56.2Intense
66.3Intense
76.3Intense
86.3Intense
96.3Intense
106.3Intense
116.3Intense
126.3Intense
136.3Intense
146.4Intense
156.4Intense
166.4Intense
176.4Intense
186.4Intense
196.4Intense
206.4Intense
216.4Intense
226.4Intense
236.4Intense
246.4Intense
256.3Intense
266.3Intense
276.3Intense
286.3Intense
296.3Intense
306.3Intense
Planning a trip in September

Hazard calendar for Bekasi

In seasonPeak

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

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

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

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

Is September a good time to visit Bekasi?

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

3.9
Sightseeing
3rd-best month of the year
6.1
Beach & pool
3rd-best month of the year

September is a weaker month for outdoor sightseeing in Bekasi. The water and warmth also suit a beach or pool day.

What to pack for Bekasi in September

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

In September, Bekasi sees daytime highs around 32°C and nights near 24°C. Pack light clothes and sun protection. Worth having: rain gear. About 11 days see rain.

light clothessun protectionrain gear

Sea temperature near Bekasi in September

The nearest coast averages about 29°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 42 km away) is warmest in May at about 30°C and coldest in January 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
Feb29Tropical
Mar29Tropical
Apr30Tropical
May30Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov30Tropical
Dec29Tropical

UV index in Bekasi in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bekasi peaks around March 16 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 14 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highMar 16UV 15Nov 14UV 6
UV index (midday)Level
Jan12Extreme
Feb12Extreme
Mar16Extreme
Apr10Extreme
May9Very high
Jun7Very high
Jul8Very high
Aug9Very high
Sep10Very high
Oct9Very high
Nov6High
Dec11Extreme

Air quality in Bekasi 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 Bekasi is worst in May — around 69 µg/m³ PM2.5 (unhealthy), and holds fairly steady the rest of the year.

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyMay 1268 µg/m³Jan 2248 µg/m³
PM2.5 (µg/m³)Level
Jan48Poor
Feb48Poor
Mar62Unhealthy
Apr68Unhealthy
May69Unhealthy
Jun65Unhealthy
Jul58Unhealthy
Aug59Unhealthy
Sep64Unhealthy
Oct68Unhealthy
Nov69Unhealthy
Dec50Poor
Location & terrain

Where is Bekasi?

Bekasi sits at 6.2°S, 107.0°E, 18 m above sea level, in Indonesia. The nearest listed city is Utan, 8.0 km away.

Topography around Bekasi

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

Within 3 km, the terrain around Bekasi has only modest variations in elevation — a maximum elevation change of 32 m around an average of 19 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 79 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,001 m.

The land around Bekasi is covered by artificial surfaces (87%) within 3 km, artificial surfaces (66%) within 16 km, and water (35%) and trees (33%) within 80 km.

3 km
32 m
16 km
79 m
80 km
3,001 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Utan 8.0 km · Jakarta 16 km · Cileungsir 18 km · Cikarang 18 km · Depok 26 km · Sawangan 30 km · Pamulang 30 km · Citeureup 30 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 Bekasi (-6.2349°, 106.9896°, elevation 18 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).