Gedangan weather in September

In September, Gedangan sees average daytime highs of 33°C and overnight lows near 23°C, with 11 mm of rain across 2.7 wet days and about 12 hours of daylight. It is the 2nd-warmest and 11th-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 46% 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 Gedangan's 3rd-clearest and 2nd-windiest month. For the whole year in context, see Gedangan's year-round climate.

Daytime high
33°
2nd warmest
Overnight low
23°
3rd coldest
Rainfall
11 mm
2.7 wet days
Daylight
12 hours
5:25 AM – 5:22 PM
Cloud cover
47%
3rd clearest
Wind
7 km/h
2nd windiest
Solar energy
6.52 kWh/m²
Travel score
3.9
out of 10

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 Gedangan 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 35°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13323
23323
33323
43323
53323
63323
73323
83323
93323
103323
113323
123323
133323
143323
153323
163323
173423
183423
193423
203423
213423
223424
233424
243424
253424
263424
273424
283424
293424
303424

How September really feels in Gedangan

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.

Gedangan weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 24°29928.912.42.5
Feb31° / 24°2782712.22.4
Mar31° / 24°25327.812.12.6
Apr31° / 24°14421.211.83.1
May32° / 24°4910.111.73.9
Jun32° / 24°246.411.64.3
Jul32° / 23°13311.64.7
Aug33° / 23°41.511.84.6
Sep33° / 23°112.7123.9
Oct34° / 24°388.112.23.1
Nov33° / 25°11718.512.32.6
Dec32° / 24°25427.512.42.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 34%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16931
26931
36931
46931
56931
66832
76832
86832
96733
106733
116733
126733
136733
146634
156634
166634
176535
186535
196535
206535
216436
226436
236436
246436
256337
266238
276238
286139
296139
306040

Chance of precipitation in September

Any precipitation

Gedangan gets around 11 mm of rain over 2.7 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 9% and peaks near 14% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
17
27
37
47
57
67
77
87
97
107
117
127
138
148
158
169
179
189
1910
2010
2111
2211
2311
2412
2512
2612
2713
2813
2913
3014

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 63% of days. Sticky, muggy-or-worse air turns up on roughly 76% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
132265100
232364100
332364100
432364100
532463100
63246490
73256390
83256390
93256390
1032562100
1132562100
1232562100
1322563100
1422562110
1522463110
1622462120
1722363120
1822362130
1922263130
2022164130
2112163141
2212064141
2312063151
2411964151
2511963161
2611864161
2711863171
2811863171
2911764171
3011762182

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
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 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 5:33 AM to 5:17 AM, and sunset from 5:25 PM to 5:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:335:25
211.95:335:24
311.95:325:24
411.95:315:24
511.95:315:24
611.95:305:24
711.95:305:24
811.95:295:24
911.95:295:23
1011.95:285:23
1111.95:285:23
1211.95:275:23
1311.95:265:23
1411.95:265:23
1512.05:255:22
1612.05:255:22
1712.05:245:22
1812.05:235:22
1912.05:235:22
2012.05:225:22
2112.05:225:21
2212.05:215:21
2312.05:215:21
2412.05:205:21
2512.05:195:21
2612.05:195:21
2712.05:185:21
2812.05:185:20
2912.15:175:20
3012.15:175:20

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.52 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.8 kWh/m² to a high of 6.52 kWh/m² in September across the year — September's 6.52 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.3Intense
46.3Intense
56.4Intense
66.4Intense
76.4Intense
86.4Intense
96.5Intense
106.5Intense
116.5Intense
126.5Intense
136.5Intense
146.5Intense
156.5Intense
166.5Intense
176.6Intense
186.6Intense
196.6Intense
206.6Intense
216.6Intense
226.6Intense
236.6Intense
246.6Intense
256.6Intense
266.6Intense
276.6Intense
286.6Intense
296.6Intense
306.6Intense
Planning a trip in September

Hazard calendar for Gedangan

In seasonPeak

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

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

Gedangan's monsoon runs December–April, 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 Gedangan?

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

3.9
Sightseeing
4th-best month of the year
7.3
Beach & pool
3rd-best month of the year

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

What to pack for Gedangan in September

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

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

light clothessun protection

Sea temperature near Gedangan in September

The nearest coast averages about 28°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 16 km away) is warmest in November at about 30°C and coldest in August near 28°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
Apr30Tropical
May30Tropical
Jun29Tropical
Jul28Tropical
Aug28Tropical
Sep28Tropical
Oct29Tropical
Nov30Tropical
Dec30Tropical

UV index in Gedangan 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 Gedangan peaks around March 17 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 16 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 17UV 13Jun 16UV 8
UV index (midday)Level
Jan10Very high
Feb11Extreme
Mar14Extreme
Apr11Extreme
May9Very high
Jun7Very high
Jul9Very high
Aug11Extreme
Sep13Extreme
Oct11Extreme
Nov10Extreme
Dec11Extreme

Air quality in Gedangan 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 Gedangan is worst in May — around 101 µg/m³ PM2.5 (unhealthy), and holds fairly steady the rest of the year.

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyMay 13101 µg/m³Aug 2267 µg/m³
PM2.5 (µg/m³)Level
Jan76Unhealthy
Feb71Unhealthy
Mar87Unhealthy
Apr99Unhealthy
May101Unhealthy
Jun95Unhealthy
Jul81Unhealthy
Aug66Unhealthy
Sep69Unhealthy
Oct80Unhealthy
Nov87Unhealthy
Dec81Unhealthy
Location & terrain

Where is Gedangan?

Gedangan sits at 7.4°S, 112.7°E, 5 m above sea level, in Indonesia. The nearest listed city is Buduran, 4.0 km away.

Topography around Gedangan

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

Within 3 km, the terrain around Gedangan has only modest variations in elevation — a maximum elevation change of 13 m around an average of 6 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 50 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,306 m.

The land around Gedangan is covered by artificial surfaces (65%) within 3 km, artificial surfaces (42%) within 16 km, and trees (32%), water (32%) and cropland (24%) within 80 km.

3 km
13 m
16 km
50 m
80 km
3,306 m
treesgrasslandcroplandartificial surfaceswaterwetlandmangroves
September weather nearby: Buduran 4.0 km · Sidoarjo 6.0 km · Driyorejo 12 km · Tanggulangin 12 km · Tulangan Utara 12 km · Surabaya 16 km · Krian 16 km · Kamal 25 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 Gedangan (-7.3908°, 112.7267°, elevation 5 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).