Diwek weather in September

In September, Diwek sees average daytime highs of 32°C and overnight lows near 22°C, with 23 mm of rain across 5 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 32°C through the month. The sky is clear or mostly clear about 31% 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 Diwek's 2nd-clearest and 1st-windiest month. For the whole year in context, see Diwek's year-round climate.

Daytime high
32°
2nd warmest
Overnight low
22°
3rd coldest
Rainfall
23 mm
5 wet days
Daylight
12 hours
5:27 AM – 5:24 PM
Cloud cover
55%
2nd clearest
Wind
6 km/h
1st windiest
Solar energy
6.36 kWh/m²
Travel score
4.2
out of 10

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 Diwek reaches about 32°C in the afternoon and slips back to 22°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 34°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)
13222
23222
33222
43222
53222
63222
73222
83222
93222
103222
113222
123222
133222
143222
153222
163222
173322
183322
193322
203322
213322
223322
233322
243322
253322
263322
273322
283322
293322
303323

How September really feels in Diwek

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.

Diwek 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° / 23°28628.312.42.6
Feb31° / 23°27826.712.22.5
Mar31° / 23°2762812.12.6
Apr31° / 23°20224.511.82.9
May31° / 23°8915.211.73.9
Jun31° / 22°538.811.64.6
Jul31° / 21°285.611.64.9
Aug32° / 21°133.311.84.9
Sep32° / 22°235124.2
Oct33° / 23°861212.23.4
Nov32° / 24°18321.412.32.7
Dec31° / 24°26626.512.42.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% 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 44%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15644
25644
35743
45743
55842
65842
75842
85842
95842
105941
115842
125941
135842
145941
155842
165941
175842
185743
195743
205644
215644
225545
235545
245545
255446
265347
275248
285248
295149
304951

Chance of precipitation in September

Any precipitation

Diwek gets around 23 mm of rain over 5 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 17% and peaks near 25% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
113
214
314
414
514
614
714
813
913
1014
1114
1214
1314
1414
1515
1615
1716
1816
1917
2018
2118
2219
2320
2420
2521
2622
2723
2823
2924
3025

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 65% of days. Sticky, muggy-or-worse air turns up on roughly 92% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1969220
2968230
31067230
41067230
51067230
61067230
71067230
81067230
91067230
101067230
111067230
121067230
13967240
14967240
15967240
16867250
17867250
18767260
19766270
20665281
21664291
22564301
23563311
24562321
25560341
26559351
27459361
28458371
29456391
30455401

Wind in September

Winds average 6 km/h in September, the windiest month of the year.

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 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 5:35 AM to 5:19 AM, and sunset from 5:26 PM to 5:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:355:26
211.95:355:26
311.95:345:26
411.95:345:26
511.95:335:26
611.95:325:26
711.95:325:26
811.95:315:25
911.95:315:25
1011.95:305:25
1111.95:305:25
1211.95:295:25
1311.95:285:25
1411.95:285:24
1512.05:275:24
1612.05:275:24
1712.05:265:24
1812.05:255:24
1912.05:255:24
2012.05:245:24
2112.05:245:23
2212.05:235:23
2312.05:235:23
2412.05:225:23
2512.05:215:23
2612.05:215:23
2712.05:205:23
2812.05:205:22
2912.15:195:22
3012.15:195:22

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.36 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.61 kWh/m² to a high of 6.36 kWh/m² in September across the year — September's 6.36 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.1Intense
26.2Intense
36.2Intense
46.2Intense
56.2Intense
66.2Intense
76.3Intense
86.3Intense
96.3Intense
106.3Intense
116.3Intense
126.3Intense
136.4Intense
146.4Intense
156.4Intense
166.4Intense
176.4Intense
186.4Intense
196.4Intense
206.4Intense
216.4Intense
226.4Intense
236.4Intense
246.4Intense
256.4Intense
266.4Intense
276.4Intense
286.4Intense
296.4Intense
306.4Intense
Planning a trip in September

Hazard calendar for Diwek

In seasonPeak

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

Diwek's monsoon runs November–April, when most of the year's rain falls.

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

Is September a good time to visit Diwek?

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

4.2
Sightseeing
4th-best month of the year
7.0
Beach & pool
3rd-best month of the year

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

What to pack for Diwek in September

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

In September, Diwek sees daytime highs around 32°C and nights near 22°C. Pack light clothes and sun protection. About 5 days see rain.

light clothessun protection

UV index in Diwek 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 Diwek peaks around March 18 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 15 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highVery highExtremeExtremeMar 18UV 13Jun 15UV 7
UV index (midday)Level
Jan12Extreme
Feb10Extreme
Mar14Extreme
Apr11Extreme
May9Very high
Jun7High
Jul9Very high
Aug11Extreme
Sep12Extreme
Oct11Extreme
Nov10Very high
Dec11Extreme

Air quality in Diwek 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 Diwek 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 Diwek?

Diwek sits at 7.6°S, 112.2°E, 53 m above sea level, in Indonesia. The nearest listed city is Jombang, 4.0 km away.

Topography around Diwek

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

Within 3 km, the terrain around Diwek has only modest variations in elevation — a maximum elevation change of 24 m around an average of 51 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 236 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,305 m.

The land around Diwek is covered by cropland (42%), artificial surfaces (29%) and trees (28%) within 3 km, cropland (60%) and trees (20%) within 16 km, and trees (47%) and cropland (34%) within 80 km.

3 km
24 m
16 km
236 m
80 km
3,305 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Jombang 4.0 km · Ngoro 12 km · Mojoagung 13 km · Kertosono 14 km · Pare 21 km · Soko 24 km · Mojokerto 26 km · Gampengrejo 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 Diwek (-7.579°, 112.2311°, elevation 53 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).