Surabaya weather in April

In April, Surabaya sees average daytime highs of 32°C and overnight lows near 26°C, with 186 mm of rain across 24 wet days and about 11.8 hours of daylight. It is the 5th-warmest and 5th-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 14% of the time in April, and the air most often feels miserable.

Daylight stretches from about 11 h 54 min at the start of April to 11 h 48 min by month's end. Set against the rest of the year, April is Surabaya's 8th-clearest and 11th-windiest month. For the whole year in context, see Surabaya's year-round climate.

Daytime high
32°
5th warmest
Overnight low
26°
9th coldest
Rainfall
186 mm
24 wet days
Daylight
11 h 48 min
5:34 AM – 5:24 PM
Cloud cover
74%
8th clearest
Wind
6 km/h
11th windiest
Solar energy
5.23 kWh/m²
Travel score
2.8
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 April

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 32°C through the month.

A typical April day in Surabaya reaches about 32°C in the afternoon and slips back to 26°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 33°C. Set against its neighbours, April runs on par with March and on par with May.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13126
23126
33126
43126
53126
63126
73126
83126
93126
103126
113126
123126
133126
143126
153226
163226
173226
183226
193226
203226
213226
223226
233226
243226
253226
263226
273226
283226
293226
303226

How April really feels in Surabaya

Once humidity and wind are folded in, April 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
30 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
0
wind chill below the day's low

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

Surabaya weather by month

How April compares with the rest of the year at a glance. April is the 5th-warmest and 5th-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 April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 14% of April, with mostly cloudy or overcast conditions the remaining 72%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12179
22179
32179
42080
52080
62080
72080
82080
92179
102179
112278
122377
132575
142575
152674
162773
172971
182971
193070
203268
213466
223466
233565
243664
253763
263763
273961
284060
294060
304258

Chance of precipitation in April

Any precipitation

Surabaya gets around 186 mm of rain over 24 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 79% and peaks near 90% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
190
290
389
489
588
688
788
887
987
1086
1186
1285
1384
1483
1583
1682
1780
1879
1978
2077
2175
2274
2372
2471
2569
2667
2766
2865
2963
3062

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April lands in the miserable band about 91% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
1793
2694
3694
4694
5694
6694
7694
8694
9694
10694
11694
12694
13793
14793
15793
16892
17892
18991
191090
201090
211189
221288
231387
241387
251486
261585
271684
281684
291783
301882

Wind in April

Winds average 6 km/h in April.

Across April, daily wind ranges from about 5 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
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 11 h 54 min at the start of April to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over April. Sunrise moves from 5:35 AM to 5:34 AM, and sunset from 5:32 PM to 5:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:355:32
211.95:355:31
311.95:355:31
411.95:355:30
511.95:355:30
611.95:355:29
711.95:355:29
811.95:355:28
911.95:355:28
1011.95:345:27
1111.95:345:27
1211.95:345:26
1311.95:345:26
1411.95:345:25
1511.85:345:25
1611.85:345:24
1711.85:345:24
1811.85:345:24
1911.85:345:23
2011.85:345:23
2111.85:345:22
2211.85:345:22
2311.85:345:21
2411.85:345:21
2511.85:345:21
2611.85:345:20
2711.85:345:20
2811.85:345:20
2911.85:345:19
3011.85:345:19

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.23 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 — April's 5.23 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.2Bright
65.2Bright
75.2Bright
85.2Bright
95.2Bright
105.2Bright
115.2Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
Planning a trip in April

Hazard calendar for Surabaya

In seasonPeak

In April, Surabaya sits inside its cyclone and monsoon season. The full year is below, with each hazard's peak months called out.

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 April a good time to visit Surabaya?

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

2.8
Sightseeing
7th-best month of the year
4.3
Beach & pool
7th-best month of the year

April is a weaker month for outdoor sightseeing in Surabaya.

What to pack for Surabaya in April

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

In April, Surabaya sees daytime highs around 32°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

Sea temperature near Surabaya in April

The nearest coast averages about 30°C in April — 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 April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 11 (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 April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April 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
April 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).