Serang weather in July

In July, Serang sees average daytime highs of 30°C and overnight lows near 25°C, with 73 mm of rain across 15 wet days and about 11.7 hours of daylight. It is the 9th-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 31% of the time in July, and the air most often feels oppressive.

Daylight stretches from about 11 h 36 min at the start of July to 11 h 42 min by month's end. Set against the rest of the year, July is Serang's 2nd-clearest and 11th-windiest month. For the whole year in context, see Serang's year-round climate.

Daytime high
30°
9th warmest
Overnight low
25°
2nd coldest
Rainfall
73 mm
15 wet days
Daylight
11 h 42 min
6:11 AM – 5:51 PM
Cloud cover
56%
2nd clearest
Wind
6 km/h
11th windiest
Solar energy
5.03 kWh/m²
Travel score
4.5
out of 10

Serang is city in Banten Province, Indonesia.

Density
2,755/km²
people per km²
Founded
2007

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical July day in Serang reaches about 30°C in the afternoon and slips back to 25°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 31°C. Set against its neighbours, July runs on par with June and on par with August.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13025
23025
33025
43025
53025
63025
73025
83025
93025
103025
113025
123025
133025
143025
153025
163025
173025
183025
193025
203025
213025
223025
233025
243025
253025
263025
273025
283025
293025
303025
313025

How July really feels in Serang

Once humidity and wind are folded in, July averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in July is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Serang weather by month

How July compares with the rest of the year at a glance. July is the 9th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 25°27728.312.32.9
Feb30° / 25°25526.312.22.8
Mar30° / 26°23627.5122.8
Apr31° / 26°19025.511.92.9
May31° / 26°13321.611.73.4
Jun30° / 25°10017.611.73.9
Jul30° / 25°731511.74.5
Aug30° / 25°5012.811.84.7
Sep31° / 25°6214.2124.2
Oct31° / 26°11920.712.13.4
Nov30° / 26°19225.812.32.9
Dec30° / 26°25626.312.33.0

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 25% of July, with mostly cloudy or overcast conditions the remaining 44%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15446
25446
35347
45248
55347
65248
75149
85149
95248
105248
115248
125347
135347
145347
155446
165446
175446
185545
195644
205644
215743
225842
235941
245941
256040
266139
276139
286139
296139
306139
316238

Chance of precipitation in July

Any precipitation

Serang gets around 73 mm of rain over 15 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 48% and peaks near 53% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
152
252
352
452
553
653
753
853
953
1053
1152
1252
1352
1451
1551
1650
1749
1848
1948
2047
2146
2245
2345
2444
2544
2643
2743
2842
2942
3041
3141

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the oppressive band about 58% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
14555
24753
34852
45050
55149
65248
75347
85446
95545
105545
115545
125644
135644
145644
155644
165644
175743
185743
195842
205842
215941
226040
236139
246238
256436
266535
276733
286832
296931
307129
317228

Wind in July

Winds average 6 km/h in July.

Across July, 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.

0246810151015202531
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
316calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 11 h 36 min at the start of July to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over July. Sunrise moves from 6:09 AM to 6:10 AM, and sunset from 5:48 PM to 5:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:095:48
211.76:095:48
311.76:105:49
411.76:105:49
511.76:105:49
611.76:105:49
711.76:105:50
811.76:105:50
911.76:105:50
1011.76:105:50
1111.76:105:50
1211.76:115:51
1311.76:115:51
1411.76:115:51
1511.76:115:51
1611.76:115:51
1711.76:115:51
1811.76:115:52
1911.76:115:52
2011.76:115:52
2111.76:115:52
2211.76:115:52
2311.76:115:52
2411.76:115:53
2511.76:105:53
2611.76:105:53
2711.76:105:53
2811.76:105:53
2911.76:105:53
3011.76:105:53
3111.76:105:53

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 5.03 kWh/m².

For context, solar energy here swings from a low near 4.66 kWh/m² to a high of 6 kWh/m² in September across the year — July's 5.03 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.8Bright
24.9Bright
34.9Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
315.3Bright
Planning a trip in July

Hazard calendar for Serang

In seasonPeak

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

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

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

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

Is July a good time to visit Serang?

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

4.5
Sightseeing
2nd-best month of the year
6.1
Beach & pool
2nd-best month of the year

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

What to pack for Serang in July

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

In July, Serang sees daytime highs around 30°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 15 days see rain.

light clothesrain gearsun protection

Sea temperature near Serang in July

The nearest coast averages about 29°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 27 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 Serang in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Serang peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 16 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeVery highMar 14UV 15Nov 16UV 7
UV index (midday)Level
Jan13Extreme
Feb13Extreme
Mar15Extreme
Apr11Extreme
May9Very high
Jun8Very high
Jul9Very high
Aug10Very high
Sep9Very high
Oct11Extreme
Nov6High
Dec12Extreme

Air quality in Serang in July

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Serang is worst in May — around 74 µg/m³ PM2.5 (unhealthy), about 1.9× the cleanest month (December, 38 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyPoorMay 2073 µg/m³Dec 2438 µg/m³
PM2.5 (µg/m³)Level
Jan39Poor
Feb41Poor
Mar51Poor
Apr62Unhealthy
May74Unhealthy
Jun69Unhealthy
Jul67Unhealthy
Aug67Unhealthy
Sep70Unhealthy
Oct69Unhealthy
Nov61Unhealthy
Dec38Poor
Location & terrain

Where is Serang?

Serang sits at 6.1°S, 106.2°E, 29 m above sea level, in Indonesia. The nearest listed city is Cilegon, 16 km away.

Topography around Serang

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

Within 3 km, the terrain around Serang has only modest variations in elevation — a maximum elevation change of 43 m around an average of 29 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 489 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,912 m.

The land around Serang is covered by artificial surfaces (61%) and trees (29%) within 3 km, trees (45%) and cropland (24%) within 16 km, and water (50%) and trees (35%) within 80 km.

3 km
43 m
16 km
489 m
80 km
1,912 m
treesgrasslandcroplandartificial surfaceswaterwetland
July weather nearby: Cilegon 16 km · Pandeglang 22 km · Kresek 25 km · Rangkasbitung 29 km · Cikupa 41 km · Pasarkemis 42 km · Labuan 46 km · Sepatan 47 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 Serang (-6.1153°, 106.1542°, elevation 29 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).