Surabaya weather in July

In July, Surabaya sees average daytime highs of 31°C and overnight lows near 25°C, with 22 mm of rain across 4.5 wet days and about 11.6 hours of daylight. It is the 10th-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 50% 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 Surabaya's 2nd-clearest and 4th-windiest month. For the whole year in context, see Surabaya's year-round climate.

Daytime high
31°
10th warmest
Overnight low
25°
2nd coldest
Rainfall
22 mm
4.5 wet days
Daylight
11 h 36 min
5:46 AM – 5:23 PM
Cloud cover
45%
2nd clearest
Wind
8 km/h
4th windiest
Solar energy
5.48 kWh/m²
Travel score
5.2
out of 10

Surabaya is city in East Java Province, Indonesia.

Density
8,598/km²
people per km²
Founded
1293

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 31°C through the month.

A typical July day in Surabaya reaches about 31°C in the afternoon and slips back to 25°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 32°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)
13125
23125
33125
43125
53125
63125
73125
83125
93125
103125
113125
123125
133125
143125
153125
163125
173125
183125
193125
203125
213125
223125
233125
243125
253125
263125
273125
283125
293125
303125
313125

How July really feels in Surabaya

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.

Surabaya weather by month

How July compares with the rest of the year at a glance. July 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
Jan31° / 25°28029.412.42.4
Feb31° / 25°26127.112.22.4
Mar31° / 26°26828.9122.4
Apr32° / 26°1862411.82.8
May32° / 26°8614.611.73.7
Jun31° / 26°49911.64.5
Jul31° / 25°224.511.65.2
Aug31° / 25°61.511.85.3
Sep32° / 25°203.3124.5
Oct33° / 26°7312.512.23.3
Nov32° / 26°17924.212.32.5
Dec31° / 26°27428.712.42.4

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 50% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 18% of July, with mostly cloudy or overcast conditions the remaining 33%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16634
26634
36436
46436
56436
66337
76337
86337
96337
106436
116436
126436
136535
146634
156634
166733
176733
186832
196832
206931
217030
227030
237030
247129
257129
267129
277129
287129
297228
307228
317228

Chance of precipitation in July

Any precipitation

Surabaya gets around 22 mm of rain over 4.5 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 14% and peaks near 19% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
119
219
319
419
519
619
719
819
919
1019
1118
1218
1317
1417
1516
1616
1715
1814
1914
2013
2112
2211
2310
2410
259
268
278
287
297
306
316

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 59% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
11225918
21235917
31235917
41245916
51245916
61246015
71255915
81255915
91256014
101256014
111265914
121266013
131266013
140266113
150266212
160266212
170276211
180276211
190286210
201296010
21130609
22130609
23131608
24132598
25134587
26135577
27136576
28137566
29138556
30139555
31140545

Wind in July

Winds average 8 km/h in July.

Across July, 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.

051015151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

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 5:45 AM to 5:45 AM, and sunset from 5:20 PM to 5:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.65:455:20
211.65:455:20
311.65:455:20
411.65:455:21
511.65:455:21
611.65:465:21
711.65:465:21
811.65:465:21
911.65:465:22
1011.65:465:22
1111.65:465:22
1211.65:465:22
1311.65:465:22
1411.65:465:23
1511.65:465:23
1611.65:465:23
1711.65:465:23
1811.65:465:23
1911.65:465:24
2011.65:465:24
2111.65:465:24
2211.65:465:24
2311.65:465:24
2411.65:465:24
2511.65:465:25
2611.75:465:25
2711.75:455:25
2811.75:455:25
2911.75:455:25
3011.75:455:25
3111.75:455:25

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 5.48 kWh/m².

For context, solar energy here swings from a low near 5.01 kWh/m² to a high of 6.73 kWh/m² in September across the year — July's 5.48 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.4Bright
125.4Bright
135.4Bright
145.4Bright
155.4Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.7Bright
265.7Bright
275.7Bright
285.7Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in July

Hazard calendar for Surabaya

In seasonPeak

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

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

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

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

Is July a good time to visit Surabaya?

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

5.2
Sightseeing
2nd-best month of the year
7.7
Beach & pool
2nd-best month of the year

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

What to pack for Surabaya in July

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

In July, Surabaya sees daytime highs around 31°C and nights near 25°C. Pack light clothes. Worth having: sun protection. About 5 days see rain.

light clothessun protection

Sea temperature near Surabaya in July

The nearest coast averages about 28°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 20 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 Surabaya 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 Surabaya 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 Surabaya 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 Surabaya 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 Surabaya?

Surabaya sits at 7.2°S, 112.8°E, 8 m above sea level, in Indonesia. The nearest listed city is Kamal, 10 km away.

Topography around Surabaya

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

Within 3 km, the terrain around Surabaya has only modest variations in elevation — a maximum elevation change of 19 m around an average of 6 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 115 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,306 m.

The land around Surabaya is covered by artificial surfaces (95%) within 3 km, artificial surfaces (36%) and water (34%) within 16 km, and water (41%), trees (26%) and cropland (22%) within 80 km.

3 km
19 m
16 km
115 m
80 km
3,306 m
treesgrasslandcroplandartificial surfaceswaterwetlandmangroves
July weather nearby: Kamal 10 km · Gresik 15 km · Kebomas 16 km · Gedangan 16 km · Driyorejo 19 km · Buduran 20 km · Sidoarjo 22 km · Bangkalan 23 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 Surabaya (-7.2492°, 112.7508°, elevation 8 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).