Banyumas weather in September

In September, Banyumas sees average daytime highs of 28°C and overnight lows near 22°C, with 90 mm of rain across 12.1 wet days and about 12 hours of daylight. It is the 10th-warmest and 10th-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 13% 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 h 06 min by month's end. Set against the rest of the year, September is Banyumas's 5th-clearest and 1st-windiest month. For the whole year in context, see Banyumas's year-round climate.

Daytime high
28°
10th warmest
Overnight low
22°
3rd coldest
Rainfall
90 mm
12.1 wet days
Daylight
12 hours
5:38 AM – 5:36 PM
Cloud cover
67%
5th clearest
Wind
8 km/h
1st windiest
Solar energy
5.45 kWh/m²
Travel score
5.4
out of 10

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 Banyumas reaches about 28°C in the afternoon and slips back to 22°C overnight — a 7°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 on par with August and on par with 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
282822
292822
302822

How September really feels in Banyumas

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.

Banyumas weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 24°42629.412.42.8
Feb30° / 24°36927.412.22.7
Mar30° / 24°33629.112.12.8
Apr30° / 24°24326.111.83.0
May30° / 23°14820.211.74.0
Jun29° / 23°9214.611.64.9
Jul28° / 22°6810.611.66.2
Aug28° / 21°548.311.86.6
Sep28° / 22°9012.1125.4
Oct29° / 23°20420.612.24.1
Nov29° / 23°35027.412.33.1
Dec29° / 24°3902912.42.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 23% of September, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24060
34060
44060
54060
64060
74060
84060
94060
103961
113961
123763
133763
143763
153763
163664
173565
183565
193466
203466
213466
223367
233268
243268
253268
263169
273169
283070
293070
302971

Chance of precipitation in September

Any precipitation

Banyumas gets around 90 mm of rain over 12.1 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 41% and peaks near 50% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
132
233
334
434
534
635
735
836
936
1037
1138
1239
1339
1440
1541
1642
1742
1843
1944
2044
2145
2246
2346
2446
2547
2647
2748
2848
2949
3050

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 60% of days. Sticky, muggy-or-worse air turns up on roughly 97% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1543520
2542530
3542530
4541540
5540550
6540550
7540550
8539560
9439570
10439570
11438580
12438580
13437590
14336610
15336601
16336601
17235621
18235621
19235621
20235621
21135631
22135631
23135631
24135631
25135631
26134650
27034660
28034660
29033670
30033670

Wind in September

Winds average 8 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
287calm
297calm
307calm

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 5:47 AM to 5:30 AM, and sunset from 5:38 PM to 5:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:475:38
211.95:465:38
311.95:465:38
411.95:455:38
511.95:455:38
611.95:445:37
711.95:445:37
811.95:435:37
911.95:425:37
1011.95:425:37
1111.95:415:37
1211.95:415:37
1311.95:405:36
1411.95:405:36
1512.05:395:36
1612.05:385:36
1712.05:385:36
1812.05:375:36
1912.05:375:35
2012.05:365:35
2112.05:355:35
2212.05:355:35
2312.05:345:35
2412.05:345:35
2512.05:335:35
2612.05:335:34
2712.05:325:34
2812.05:315:34
2912.15:315:34
3012.15:305:34

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.45 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.28 kWh/m² to a high of 5.45 kWh/m² in September across the year — September's 5.45 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.4Bright
35.4Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.4Bright
95.4Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.5Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
Planning a trip in September

Hazard calendar for Banyumas

In seasonPeak

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

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

Banyumas's rainy season runs October–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 Banyumas?

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

5.4
Sightseeing
3rd-best month of the year
6.3
Beach & pool
3rd-best month of the year

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

What to pack for Banyumas in September

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

In September, Banyumas sees daytime highs around 28°C and nights near 22°C. Pack light clothes. Worth having: rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

Sea temperature near Banyumas in September

The nearest coast averages about 26°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 41 km away) is warmest in April at about 29°C and coldest in August near 26°C.

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

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May29Tropical
Jun28Warm
Jul27Warm
Aug26Warm
Sep26Warm
Oct27Warm
Nov28Warm
Dec29Tropical

UV index in Banyumas 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 Banyumas peaks around March 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 14 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 highExtremeExtremeMar 12UV 15Jun 14UV 7
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar15Extreme
Apr12Extreme
May9Very high
Jun7High
Jul10Very high
Aug11Extreme
Sep12Extreme
Oct13Extreme
Nov9Very high
Dec12Extreme

Air quality in Banyumas 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 Banyumas is worst in May — around 47 µg/m³ PM2.5 (poor), and holds fairly steady the rest of the year.

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateMay 1647 µg/m³Sep 1730 µg/m³
PM2.5 (µg/m³)Level
Jan36Poor
Feb36Poor
Mar40Poor
Apr45Poor
May47Poor
Jun44Poor
Jul39Poor
Aug32Moderate
Sep30Moderate
Oct32Moderate
Nov32Moderate
Dec31Moderate
Location & terrain

Where is Banyumas?

Banyumas sits at 7.5°S, 109.3°E, 28 m above sea level, in Indonesia. The nearest listed city is Sokaraja, 6.0 km away.

Topography around Banyumas

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

Within 3 km, the terrain around Banyumas has only modest variations in elevation — a maximum elevation change of 154 m around an average of 39 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 801 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,396 m.

The land around Banyumas is covered by trees (57%) and cropland (27%) within 3 km, trees (54%) and cropland (31%) within 16 km, and trees (51%) and water (27%) within 80 km.

3 km
154 m
16 km
801 m
80 km
3,396 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Sokaraja 6.0 km · Purwokerto 12 km · Kroya 14 km · Purbalingga 16 km · Baturaden 25 km · Gombong 26 km · Wangon 26 km · Cilacap 39 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 Banyumas (-7.5142°, 109.2942°, elevation 28 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).