Indonesia weather in September 2025

Expect 33°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Indonesia in September. Check more long-term weather averages for Indonesia in September before you book your next holiday to Indonesia in 2025/2026.

  • 33°C maximum daytime temperature in September in Indonesia (Jakarta)33
    33°C max day temperature
  • 9 hours of sunshine per day
  • 8 days with some rainfall in September in Indonesia (Jakarta)8
    8 days with some rainfall
  • 23°C minimum night-time temperature in September in Indonesia (Jakarta)23
    23°C min night temperature
  • 12 hours of daylight per day in September in Indonesia (Jakarta)12
    12 hours of daylight per day
  • Very high heat & humidity in September in Indonesia (Jakarta)VH
    Very High heat & humidity
  • 93 mm monthly rainfall in September in Indonesia (Jakarta)93
    93 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Indonesia (Jakarta)11
    11+ (Extreme) UV index
  • 29°C sea temperature in September in Indonesia (Jakarta)29
    29°C sea temperature

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The September weather guide for Indonesia (Jakarta) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Top Indonesia destinations

Below are average maximum temperatures at popular countries, regions and places in Indonesia in September. Select a holiday destination to see more weather parameters.

All Indonesia regions

All Indonesia destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Indonesia

How hot is it in Indonesia in September?

Daytime temperatures usually reach 33°C in Jakarta, Indonesia in September with very high heat and humidity, falling to 23°C at night.

How sunny is it in Indonesia in September?

There are normally 9 hours of bright sunshine each day in Jakarta, Indonesia in September - that's 71% of daylight hours.

How warm is the sea around Indonesia in September?

The average sea temperature around Jakarta, Indonesia in September is 29°C.

Does it rain in Indonesia in September?

There are usually 8 days with some rain in Jakarta, Indonesia in September and the average monthly rainfall is 93mm.

Indonesia September sunrise & sunset times

Browse the sunrise and sunset times for Indonesia in September 2025. Select a month to view Indonesia sunrise and sunset times for the next 12 months. The Indonesia sunrise and sunset times shown below are for Jakarta.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:53 17:53
Monday, 15th September 2025 05:46 17:50
Tuesday, 30th September 2025 05:38 17:47

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