Semarang weather in September 2025

Expect 34°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Semarang in September. Check more long-term weather averages for Semarang in September before you book your next holiday to Indonesia in 2025/2026.

  • 34°C maximum daytime temperature in September in Semarang34
    34°C max day temperature
  • 10 hours of sunshine per day
  • 4 days with some rainfall in September in Semarang4
    4 days with some rainfall
  • 22°C minimum night-time temperature in September in Semarang22
    22°C min night temperature
  • 12 hours of daylight per day in September in Semarang12
    12 hours of daylight per day
  • Very high heat & humidity in September in SemarangVH
    Very High heat & humidity
  • 62 mm monthly rainfall in September in Semarang62
    62 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Semarang11
    11+ (Extreme) UV index
  • 28°C sea temperature in September in Semarang28
    28°C sea temperature

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The September weather guide for Indonesia (Semarang) 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.

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

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More about Indonesia

How hot is it in Semarang in September?

Daytime temperatures usually reach 34°C in Semarang in September with very high heat and humidity, falling to 22°C at night.

How sunny is it in Semarang in September?

There are normally 10 hours of bright sunshine each day in Semarang in September - that's 80% of daylight hours.

How warm is the sea around Semarang in September?

The average sea temperature around Semarang in September is 28°C.

Does it rain in Semarang in September?

There are usually 4 days with some rain in Semarang in September and the average monthly rainfall is 62mm.

Semarang September sunrise & sunset times

Browse the sunrise and sunset times for Semarang in September 2025. Select a month to view Semarang sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:39 17:38
Monday, 15th September 2025 05:32 17:35
Tuesday, 30th September 2025 05:24 17:33

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