Cilacap climate

Name: Cilacap
Address: ID

Cilacap is warmest in April, with average highs of 28 °C, and coldest in August, when nights average 23 °C. December is the wettest month (387 mm) and August the driest (53 mm). Figures are 1991–2020 climate normals.

Across a full year Cilacap averages 2,673 mm of rain and 365 days above 25 °C.

Indonesia · population 256,996 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month April 28 °C
Coldest month August 23 °C
Driest month August 53 mm
Wettest month December 387 mm
Least cloud August 62 % cloud
Hottest on record March 31 °C
Coldest on record October 18 °C
Warmest sea April 29 °C

What to expectCilacap through the year

Cilacap changes little through the year. Average daily highs stay between 27 and 28 °C, so no month stands out as a season in the way it would further from the equator.

Counted across a normal year, 365 days a year reach 25 °C, 2 of them reach 30 °C. The warmest reading in the 1991–2020 record is 31 °C, in March.

Rain is strongly seasonal. December averages 387 mm against 53 mm in August — 7.3 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Cilacap is warmest in April at 29 °C and coldest in August at 26 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	28.1 °C	375 mm	91 %
February	28.2 °C	336 mm	91 %
March	28.3 °C	329 mm	87 %
April	28.4 °C	248 mm	82 %
May	28.3 °C	154 mm	68 %
June	27.8 °C	106 mm	64 %
July	27.0 °C	72 mm	63 %
August	26.8 °C	53 mm	62 %
September	27.0 °C	85 mm	70 %
October	27.4 °C	199 mm	78 %
November	27.6 °C	330 mm	88 %
December	27.8 °C	387 mm	92 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	28.1 °C	24.7 °C	26.2 °C	30.9 °C	22.3 °C	31	0
February	28.2 °C	24.7 °C	26.3 °C	30.9 °C	22.9 °C	28	0
March	28.3 °C	24.7 °C	26.4 °C	31.1 °C	22.6 °C	31	1
April	28.4 °C	24.7 °C	26.5 °C	30.5 °C	22.3 °C	30	0
May	28.3 °C	24.7 °C	26.4 °C	30.5 °C	20.7 °C	31	0
June	27.8 °C	24.1 °C	25.9 °C	30.0 °C	19.6 °C	30	0
July	27.0 °C	23.3 °C	25.1 °C	30.4 °C	18.8 °C	31	0
August	26.8 °C	23.0 °C	24.8 °C	29.3 °C	18.8 °C	31	0
September	27.0 °C	23.3 °C	25.0 °C	30.2 °C	18.9 °C	30	0
October	27.4 °C	23.9 °C	25.6 °C	29.4 °C	18.3 °C	31	0
November	27.6 °C	24.4 °C	25.9 °C	30.7 °C	21.5 °C	30	0
December	27.8 °C	24.7 °C	26.1 °C	31.1 °C	22.4 °C	31	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	375 mm	29	13 h/day	91 %	84 %	11 km/h	28.7 °C
February	336 mm	27	12 h/day	91 %	85 %	10.0 km/h	28.7 °C
March	329 mm	29	12 h/day	87 %	85 %	9.5 km/h	29.0 °C
April	248 mm	26	12 h/day	82 %	85 %	9.2 km/h	29.1 °C
May	154 mm	21	12 h/day	68 %	85 %	11 km/h	28.7 °C
June	106 mm	16	12 h/day	64 %	84 %	12 km/h	27.8 °C
July	72 mm	11	12 h/day	63 %	83 %	15 km/h	26.5 °C
August	53 mm	8	12 h/day	62 %	81 %	17 km/h	25.7 °C
September	85 mm	12	12 h/day	70 %	83 %	17 km/h	25.7 °C
October	199 mm	20	12 h/day	78 %	84 %	14 km/h	26.6 °C
November	330 mm	27	12 h/day	88 %	86 %	11 km/h	27.8 °C
December	387 mm	29	13 h/day	92 %	85 %	11 km/h	28.6 °C

How Cilacap compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Cilacap	28 °C	23 °C	2,673 mm	365
Purwokerto · Indonesia	30 °C	21 °C	2,989 mm	365
Tegal · Indonesia	32 °C	23 °C	2,945 mm	365
Tasikmalaya · Indonesia	28 °C	20 °C	3,322 mm	344
Pemalang · Indonesia	31 °C	23 °C	3,084 mm	365
Pekalongan · Indonesia	31 °C	23 °C	3,350 mm	365
Cirebon · Indonesia	32 °C	24 °C	2,051 mm	365

Where Cilacap ranks

Ranking	Position	Value
Best beach destinations in Asia in August	29th of 50	90/100
Warmest sea temperatures in Asia in February	37th of 50	29 °C
Warmest sea temperatures in Asia in January	38th of 50	29 °C
Best beach destinations in Asia in July	42nd of 50	83/100

Planning a trip? See the best time to visit Cilacap.

QuestionsCommon questions about Cilacap’s climate

When is the best time to visit Cilacap?

That depends on what you want, so the honest answer is a comparison rather than a single month. July, August, September sit closest to 20 °C on average, April is the warmest month and August the driest. The month-by-month table above has the full picture.

How hot does Cilacap get?

In April, the warmest month, daily highs average 28 °C. About 2 days a year pass 30 °C. The highest value in the 1991–2020 record is 31 °C.

How cold does it get in winter?

Nights average 23 °C in August, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Cilacap?

December, averaging 387 mm over 29 days with rain. The driest month is August with 53 mm. The year as a whole averages 2,673 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Cilacap rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: -7.726°, 109.009° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.