January weather forecast
Indonesia

January is traditionally part of the wet season in Indonesia, with much of the country experiencing higher rainfall and increased humidity. The average temperature during this month tends to remain steady, typically between 23°C (73.4°F) to 28°C (82.4°F). In certain high-altitude regions such as the Dieng Plateau in Central Java and the mountains of Papua, temperatures may fall lower, especially at night, providing a cooler respite from the tropical heat.

In terms of precipitation, January is often one of the rainiest months of the year in many parts of the country. For instance, Jakarta, the capital city, receives an average rainfall of 300mm (11.81") in January, making it one of the wettest months for the city. Similarly, the popular tourist destination of Bali also sees increased rainfall during this time, with an average of approximately 300mm (11.81").

When compared to December, January's weather conditions are relatively similar, with both months falling within the peak of the rainy season. However, when looking forward to February, while still within the wet season, some regions might begin to experience a slight decrease in rainfall. It's worth mentioning that despite the increased rainfall, rain in Indonesia is often characterized by heavy but brief showers, usually in the afternoon or late evening, followed by sunshine.

Visitors during January should expect and prepare for these conditions, particularly when planning outdoor activities. Despite the rain, this month can still offer vibrant green landscapes and fewer crowds at popular tourist sites. However, caution is advised in areas prone to flooding or landslides during heavy rains.

---

• Jakarta - January »
  The months with the lowest UV index in Jakarta are January through December, with an average maximum UV index of 7. January in Jakarta starts the year off with a mix of warm temperatures, abundant rainfall, and high humidity.
• Surabaya - January »
  The months with the lowest UV index in Surabaya are January through December, with an average maximum UV index of 7. In Surabaya January, February and July are characterised by the lowest temperatures, recording an average high of 30.1°C (86.2°F).
• Bandung - January »
  The months with the lowest UV index in Bandung are January through December, with an average maximum UV index of 6. In Bandung, Indonesia, in January, it is raining for 30.3 days, with typically 280mm (11.02") of accumulated precipitation.
• Medan - January »
  The months with the highest UV index in Medan, Indonesia, are January through December, with an average maximum UV index of 7. The months with the lowest UV index in Medan are January through December, with an average maximum UV index of 7.
• Bekasi - January »
  In Bekasi during January, the rain falls for 28.7 days and regularly aggregates up to 187mm (7.36") of precipitation. January through December, with an average maximum UV index of 7, are months with the lowest UV index in Bekasi, Indonesia.
• Palembang - January »
  In Palembang in January, it is raining for 24 days, with typically 108mm (4.25") of accumulated precipitation. With an average maximum UV index of 6, January is the month with the lowest UV index in Palembang, Indonesia.
• Tangerang - January »
  The months with the lowest UV index in Tangerang are January through December, with an average maximum UV index of 7. The months with the lowest UV index in Tangerang are January through December, with an average maximum UV index of 7.
• Makassar - January »
  The month with the most rainfall in Makassar is January, when the rain falls for 26.4 days and typically aggregates up to 194mm (7.64") of precipitation. Makassar witnesses the coldest weather in January, with temperatures averaging a high of 28.7°C (83.7°F) and a low of 25.7°C (78.3°F).
• Semarang - January »
  January through December, with an average maximum UV index of 6, are months with the highest UV index in Semarang, Indonesia. In Semarang in January, the average water temperature is 28.9°C (84°F).
• Depok - January »
  In Depok in January, during 28.3 rainfall days, 188mm (7.4") of precipitation is typically accumulated. In Depok, in January, it is raining for 28.3 days, with typically 188mm (7.4") of accumulated precipitation.
• Batam - January »
  January and December, with an average relative humidity of 79%, are the most humid months in Batam. January through December, with an average maximum UV index of 7, are months with the lowest UV index in Batam, Indonesia.
• Pekanbaru - January »
  On the first day of January in Pekanbaru sunrise is at 06:14 and sunset at 18:20. Pekanbaru experiences its coldest period in January and December, averaging a high-temperature of 30°C (86°F).