Cilacap climate
Cilacap (Indonesia) has a tropical monsoon climate (Köppen Am). The average temperature over the year is 26 °C79 °F, and about 2,672 mm105 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Cilacap climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 3086 | 2475 | 2780 | 31412 |
| Feb | 3086 | 2475 | 2780 | 31813 |
| Mar | 3086 | 2475 | 2780 | 29712 |
| Apr | 3085 | 2475 | 2780 | 2519.9 |
| May | 2985 | 2475 | 2780 | 2198.6 |
| Jun | 2984 | 2373 | 2678 | 1365.4 |
| Jul | 2882 | 2171 | 2576 | 983.9 |
| Aug | 2883 | 2169 | 2476 | 381.5 |
| Sep | 2984 | 2170 | 2577 | 893.5 |
| Oct | 3086 | 2373 | 2679 | 2168.5 |
| Nov | 3085 | 2474 | 2780 | 32913 |
| Dec | 2985 | 2475 | 2780 | 36614 |
| Year | 3086 | 2169 | 2679 | 2,672105 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 87% | 90% | 4.9 | 12:31 |
| Feb | 88% | 90% | 4.8 | 12:22 |
| Mar | 88% | 86% | 5.0 | 12:10 |
| Apr | 89% | 82% | 5.0 | 11:57 |
| May | 89% | 68% | 4.8 | 11:46 |
| Jun | 89% | 59% | 4.7 | 11:41 |
| Jul | 88% | 54% | 4.8 | 11:43 |
| Aug | 86% | 50% | 5.4 | 11:52 |
| Sep | 85% | 61% | 5.6 | 12:04 |
| Oct | 84% | 75% | 5.4 | 12:17 |
| Nov | 87% | 87% | 4.9 | 12:29 |
| Dec | 88% | 93% | 4.7 | 12:34 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Cilacap is like
The warmest month is April, with an average high of 30 °C85 °F and a low of 24 °C75 °F. The coldest is August, when highs average 28 °C83 °F and lows 21 °C69 °F. Temperatures barely change through the year: the warmest and the coolest month differ by only 2.4 °C4.4 °F.
It is very wet, receiving about 2,672 mm105 in of precipitation per year. The wettest three-month stretch is November–January, which brings 38% of the annual total. The wettest month is December (366 mm14 in), the driest is August (38 mm1.5 in).
Relative humidity ranges from 84% in October to 89% in June. The clearest skies (lowest average cloud amount, 50%) are typical of August. Average wind speed near the ground ranges from 5 km/h (3 mph) in March to 9 km/h (5 mph) in September.
Best time to visit Cilacap
Based on these averages, the most comfortable months for sightseeing and outdoor activities are August: average highs of 28 °C83 °F to 28 °C83 °F with 38 mm1.5 in to 38 mm1.5 in of precipitation per month.
The most challenging month is December, which is very wet (366 mm14 in) and humid (88% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Cilacap
- Wetter months (November–April) — highs 2985 to 30 °C86 °F, lows around 24 °C74 °F, about 313 mm12 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Drier months (May–October) — highs 2882 to 30 °C86 °F, lows 2169 to 24 °C75 °F, about 133 mm5.2 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
How Cilacap compares
Compared with Tasikmalaya, about 98 km to the northwest, Cilacap is on average 2.1 °C3.7 °F warmer and receives 11% less precipitation (2,672 mm105 in vs 2,996 mm118 in). The difference is largest in October (2.3 °C4.1 °F warmer).
Of the 110 places in Indonesia covered by World Climates, Cilacap is the 87th warmest by annual mean temperature and the 21st wettest by annual precipitation. See all of them on the Indonesia climate page.
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): Guápiles (Costa Rica, Af), Apartadó (Colombia, Am) and Leticia (Colombia, Af).
Nearby places
- Purwokerto 42 km · 26 °C79 °F · 2,608 mm103 in
- Tasikmalaya 98 km · 24 °C75 °F · 2,996 mm118 in
- Astanajapura 111 km · 27 °C80 °F · 2,311 mm91 in
- Pekalongan 119 km · 27 °C81 °F · 2,170 mm85 in
- Cirebon 124 km · 28 °C82 °F · 2,361 mm93 in
- Garut 131 km · 21 °C70 °F · 2,487 mm98 in
- Magelang 136 km · 25 °C76 °F · 2,330 mm92 in
- Yogyakarta 150 km · 26 °C79 °F · 2,162 mm85 in
Frequently asked questions
What is the warmest month in Cilacap?
April is the warmest month in Cilacap, with an average high of 30 °C (85 °F) and an average low of 24 °C (75 °F).
What is the coldest month in Cilacap?
August is the coldest month, with an average high of 28 °C (83 °F) and an average low of 21 °C (69 °F).
When does it rain the most in Cilacap?
December is the wettest month with about 366 mm (14.4 in) of precipitation; August is the driest with about 38 mm (1.5 in).
What is the best time to visit Cilacap?
Judging by long-term averages, the most comfortable months are August.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 171 m, while Cilacap lies at about 10 m. Temperatures on this page were therefore adjusted by +1 °C1.9 °F using the standard lapse rate of 6.5 °C per 1,000 m.