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The climate in Indonesia

Average daytime and nighttime temperatures

All climate diagrams on this page result from the collected data of 133 weather stations.
Weather stations at an altitude above 850m have not been included.
All data correspond to the average monthly values of the last 20 years.
Back to overview: Indonesia
Climate zone: tropics
High humidity and hot temperatures make the weather in Indonesia at times pleasant but also tropical humid. It is warm to hot all year round and invites to bathe at average water temperatures of 28 degrees. The warmest and at the same time rainiest island group is Java. The coldest is Moluccas. Dued to the lesser rain the best time for traveling is from August to September. Most precipitation falls from December to January.
Duration of daylight and sunshine in Indonesia
Compare climate with other regions or countries
Hours of sunshine per daySunshine hours per day in Indonesia
Rainy days per monthRainy days per month in Indonesia
Precipitation in mm/dayPrecipitation in Indonesia
Water temperatureWater temperatures in Indonesia
Relative humidity in %Relative humidity in Indonesia
Absolute humidity in g/m³Absolute humidity in Indonesia

Archipelagos in Indonesia

All figures per year. For detailed climate data click on the name of the region.
ArchipelagoTemperature
max Ø day
Temperature
min Ø night
Sunshine
hours
Rainy
days
PrecipitationHumidity
Borneo32.0 °C23.8 °C1,752 h188 3,205 l85.0 %
Java32.1 °C24.5 °C2,154 h130 2,132 l82.0 %
Lesser Sunda Islands31.9 °C23.7 °C2,628 h95 1,387 l80.0 %
Moluccas30.8 °C23.8 °C1,898 h173 2,730 l83.0 %
Riau Islands31.1 °C24.5 °C1,862 h149 2,537 l
Sulawesi31.9 °C23.7 °C2,154 h155 2,424 l83.0 %
Sumatra31.7 °C23.6 °C1,789 h152 2,584 l83.0 %
West Papua31.2 °C24.1 °C1,752 h190 2,982 l85.0 %

Temperature records of the last 73 years

The hottest temperature measured from 1949 to July 2022 was reported by the Maumere Sunda Inseln weather station. In September 2001 the record temperature of 43.1 °C was reported here. The hottest summer from July to September, based on all 127 weather stations in Indonesia below 850 metres altitude, was recorded in 2016 with an average temperature of 27.4 °C. This average temperature will normally be measured every 4 to 6 hours, thus also including the nights. Normally, this value is 26.9 degrees Celsius. The average maximum daily temperature at that time was 31.9 °C.
The coldest day in these 73 years was reported by the weather station Fak Fak West Papua. Here the temperature dropped to zero °C in June 2009. Fak Fak West Papua lies at an altitude of 130 meters above sea level. The coldest winter (January to March) was in 1963 with an average temperature of 25.7 °C. In Indonesia, it is usual to have about 1.3 degrees more at 27.1 °C for this three-month period.
The most precipitation fell in February 1953. With 78.6 mm per day, the Makassar Airport Sulawesi weather station recorded the highest monthly average of the last 73 years. Incidentally, the region with the most rainfall for the whole year is around Sibolga Sumatra. The driest region is near Palu Airport Sulawesi.

Long-term development of temperatures from 2000 - 2021

In contrast to single record values, a long-term development cannot simply be brought about by all weather stations in the country. Both the number and the locations are constantly changing. A simply calculated average value would give a falsified result. If several measuring stations in particularly cold mountain or coastal regions are added in one year, the average would already decrease as a result of this alone. If a station fails during the summer or winter months, it does not provide any values and falsifies the average again. The subsequent long-term development was therefore reduced to only 4 measuring points in order to have actually comparable data over as long a period as possible.
In the years 2000 to 2021 there were only these 4 weather stations in the whole country, which reported continuous temperature values (Medan Sumatra, Rengat Sumatra, Sibolga Sumatra, Denpasar Sunda Inseln). From these weather reports we have created a long-term development that shows the monthly average temperatures. The hottest month in this entire period was April 2016 with 28.5 °C. September 2006 was the coldest month with an average temperature of 26.1 °C.
The average annual temperature was about 26.9 °C in the years after 2000 and about 27.2 °C in the last years before 2021. So over the past 22 years it has only increased by a minimal 0.3 °C. This trend only applies to the selected 4 weather stations in Indonesia. A considerably more comprehensive evaluation of the global warming has been provided separately.
Long-term development of temperatures in Indonesia

Data basis and methodology

The data of the individual measuring stations are based on the archives of the German Weather Service, individual values averaged and supplemented by own elements. In order to determine a representative national average, average values were first calculated for each part of the country, which were then summarized at the national level. Thus, if a disproportionate number of weather stations are located in a small area, their number does not affect the national average. There are 128 stations in Indonesia itself. In 5 cases, neighboring but nearby weather stations were also used to obtain more accurate values.
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