Weather in Indonesia by Month

Indonesia is an archipelago in Southeast Asia that borders the Indian and Pacific Oceans. Indonesia shares land borders with Papua New Guinea, Malaysia and Timor-Leste. The country shares maritime borders with Australia, India, Palau, the Philippines, Singapore, Thailand and Vietnam. Approximately 255 million people live on an area of 1.9 million km2.

Indonesia has 17,508 islands, of which about 6,000 are inhabited. Most of the large islands are mountainous, with peaks from 3000 to 3800 m. Mount Punchak Jaya in New Guinea (4884 m) is the highest point in Indonesia. There are about 400 volcanoes on the territory of the country, 90 of them are active.

The climate in Indonesia is predominantly equatorial – hot, humid and rainy. Inner and northern Sumatra, southeastern Borneo, northern Sulawesi, Maluku Island, New Guinea territories are characterized by a subequatorial climate with no dry season.

The best time of the year to visit Indonesia is from May to September when the days are dry and sunny. During the rainy season, temperatures remain high and precipitation falls during the night for several hours. The monthly weather calendar will help you choose the best time to travel.


In the realm of eternal summer, during the day the thermometer shows + 28 ° С… + 30 ° С, and at night – up to + 21 ° С… + 24 ° С. The water in the oceans is heated to a temperature of +28°C. January is the peak of the rainy season. The least precipitation falls in the northern resort of Bali – Ubud (110 mm), and most of all – in the capital of Western Sumatra, the city of Padang (350 mm).


In February, the rainy season continues. Thermometers will show +28°C during the day, and about +23°C at night. The water in the oceans is consistently warm – about + 28 ° C. It is cooler in mountainous areas: +20°С during the day and +15°С at night. Usually in February there are 17-22 rainy days, during this period 250 mm of precipitation falls. Throughout the country, the air temperature and the number of rainy days are approximately the same.


The rainy season is on the decline, and with it, air humidity indicators are falling. In March, you can expect 13-15 rainy days. The average air temperature during the day is +32°С…+34°С, at night +23°С…+25°С, and the water near the coast is up to +25°С…+26°С. On the island of Sumatra, rainfall is still a reminder of the continuation of the rainy season. About 300 mm of them fall this month. At night, showers can be accompanied by thunderstorms.


In April, the amount of precipitation decreases markedly. But other than a decrease in humidity, you should not expect other changes. In almost the entire territory of the island state, the air warms up to + 34 ° C during the day, and at night the temperature drops to + 25 ° C. The water near the coast is warm enough (+28C) for swimming. Its transparency accompanies unique diving. It will rain for 7-11 days in April.


The average daytime air temperature is +33°С, and the night temperature is about +24°С. By Indonesian standards, the “dry” season is a relative concept. It is explained by the fact that it does not rain every night and less intensively. On the territory of the island nation in May, about 120 mm of precipitation is expected. The weather differs only in the city of Padang on the island of Sumatra, where up to 300 mm of precipitation falls.


In the summer in Indonesia, the air temperature drops and the ocean water becomes cooler. Average temperatures are at +30°C during the day and +23°C at night. The water temperature in the oceans is +29°C. June is considered the best month to visit the paradise island of Bali (31°C during the day and 24°C at night). On the island of Sumarta, where the thermometer reaches 29°C during the day and 23°C at night, 270 mm of precipitation falls in June.


The air temperature is kept at +29°С…+32°С during the day and +23°С…+25°С at night. The water temperature off the coast is +28°C. Only the island of Sumatra does not know the dry season. Although the temperatures here are the same as in the rest of the country, it rains much more often. A minimum of 270 mm of precipitation is expected for the month, when this figure does not exceed 55 mm in the rest of the island nation.


The dry season continues throughout Indonesia. The average temperature during the day will be +33°C, and at night the thermometer will drop to +25°C. The water near the coast maintains a temperature of +28°C. It is less hot on the islands of Sumatra and Bali: during the day the air warms up to +29°С, at night – up to +23°С. The amount of precipitation in Sumatra increases to 320 mm.


Most of the country has hot and dry weather. Day and night temperatures reach +30°C and +25°C respectively. The water near the coast is warm enough for swimming – about +28°С. Only on the island of Sumatra, with the advent of autumn, rainy and cool weather sets in. Here, day and night temperatures are lower on average by 3-5 degrees than in the rest of Indonesia. Rainy weather is not a hindrance for tourists who go to see the many attractions.


October is the last month of hot and dry weather in the resorts of Indonesia. Starting from the second half of the month, there will be more rainy days, and the amount of precipitation will reach 140 mm. In Bali in October, the daytime temperature is kept within + 33 ° С, at night – about + 25 ° С. The water near the coast warms up to +26°C. On the island of Sumatra, it is a little cooler: + 28 ° C during the day and + 23 ° C at night. The water in the oceans remains warm at this time of the year – up to +28°C. Sumatra is also distinguished by intense precipitation in October, the amount of which is 480 mm.


In November, Indonesia welcomes the rainy season. During the day, the air warms up to +30°С…+32°С, and at night – up to +25°С. The water temperature of the oceans is still comfortable for swimmers – up to + 28 ° С. The amount of precipitation increases and averages 240 mm.


Water and air temperatures in December do not differ from those in November. During the month, about 270 mm of precipitation falls. Expect 14 to 20 rainy days. The weather in Sumatra is slightly different. The daytime temperature here is kept within +28°C, and at night the figures drop to +19°C. The amount of precipitation per month is 460 mm.