Indiana weather in September 2025

Expect 25°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Indiana in September. Check more long-term weather averages for Indiana in September before you book your next holiday to Indiana in 2025/2026.

  • 25°C maximum daytime temperature in September in Indiana (Indianapolis)25
    25°C max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in September in Indiana (Indianapolis)8
    8 days with some rainfall
  • 13°C minimum night-time temperature in September in Indiana (Indianapolis)13
    13°C min night temperature
  • 12 hours of daylight per day in September in Indiana (Indianapolis)12
    12 hours of daylight per day
  • Low heat & humidity in September in Indiana (Indianapolis)L
    Low heat & humidity
  • 75 mm monthly rainfall in September in Indiana (Indianapolis)75
    75 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Indiana (Indianapolis)6
    6 (High) UV index

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The September weather guide for Indiana (Indianapolis) 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 Indiana destinations

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

All Indiana destinations

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

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How hot is it in Indiana in September?

Daytime temperatures usually reach 25°C in Indianapolis, Indiana in September with low heat and humidity, falling to 13°C at night.

How sunny is it in Indiana in September?

There are normally 8 hours of bright sunshine each day in Indianapolis, Indiana in September - that's 63% of daylight hours.

Does it rain in Indiana in September?

There are usually 8 days with some rain in Indianapolis, Indiana in September and the average monthly rainfall is 75mm.

Indiana September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:13 19:15
Monday, 15th September 2025 06:26 18:53
Tuesday, 30th September 2025 06:40 18:28

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